CVE-2026-50257

Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in misyncdestroyfence()

publishedCWE-416

A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence(). A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to set up a fence and await that fence, then a second X connection destroys the fence, causing the use-after-free. This may be used to crash the server, or for privilege escalation if the X server runs as root.

Technical severity7.8 highCVSS 3.1 · CNA: redhat

Published2026-06-05Source updated 2026-11-04

Collected2026-11-053 attributed sources

Fixes and workarounds

Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Source: CNA: redhat

Fix

RHSA-2026:49519: Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION), Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) RHSA-2026:46473: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) RHSA-2026:36083: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) RHSA-2026:36798: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) RHSA-2026:26566: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) RHSA-2026:28923: Red Hat Enterprise Linux AppStream (v. 8) RHSA-2026:26709: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) RHSA-2026:26562: Red Hat Enterprise Linux AppStream (v. 8) RHSA-2026:46382: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) RHSA-2026:36792: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) RHSA-2026:46460: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) RHSA-2026:36791: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) RHSA-2026:38810: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) RHSA-2026:46385: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) RHSA-2026:36768: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) RHSA-2026:38502: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) RHSA-2026:46377: Red Hat Enterprise Linux AppStream E4S (v.9.2) RHSA-2026:36086: Red Hat Enterprise Linux AppStream E4S (v.9.2) RHSA-2026:36633: Red Hat Enterprise Linux AppStream E4S (v.9.2) RHSA-2026:46456: Red Hat Enterprise Linux AppStream E4S (v.9.4) RHSA-2026:36087: Red Hat Enterprise Linux AppStream E4S (v.9.4) RHSA-2026:36632: Red Hat Enterprise Linux AppStream E4S (v.9.4) RHSA-2026:46392: Red Hat Enterprise Linux AppStream EUS (v.9.6) RHSA-2026:36085: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6) RHSA-2026:36634: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6) RHSA-2026:29844: Red Hat Enterprise Linux AppStream (v. 9) RHSA-2026:26610: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) RHSA-2026:26590: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)

Source: ADP: redhat-SADP

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: [email protected]

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Red Hat Enterprise Linux 10 Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:24.1.9-4.el10_2.2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 10.0 Extended Update Support Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:24.1.5-6.el10_0.1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.1.0-25.el6_10.18; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 7 Extended Lifecycle Support Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.4-35.el7_9; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 7 Extended Lifecycle Support Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.8.0-36.el7_9.5; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:21.1.3-20.el8_10.2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-28.el8_10.2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.15.0-10.el8_10; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.10-5.el8_4; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.11.0-8.el8_4.16; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.10-5.el8_4; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.11.0-8.el8_4.16; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-8.el8_6; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:21.1.3-2.el8_6.7; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.0-6.el8_6.18; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-8.el8_6; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:21.1.3-2.el8_6.7; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.0-6.el8_6.18; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-19.el8_8; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:21.1.3-13.el8_8.1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.0-15.el8_8.18; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-19.el8_8; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:21.1.3-13.el8_8.1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.0-15.el8_8.18; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:24.1.9-4.el9_8.2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-34.el9_8.2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.15.0-7.el9_8.2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-21.el9_2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:21.1.3-10.el9_2.1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.0-14.el9_2.15; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-29.el9_4; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:22.1.9-8.el9_4.1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.13.1-8.el9_4.10; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-34.el9_6; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:23.2.7-6.el9_6.1; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.14.1-11.el9_6; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 6 Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unknown	CNA: redhat
Red Hat Enterprise Linux 10 Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:24.1.9-4.el10_2.2; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 10.0 Extended Update Support Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:24.1.5-6.el10_0.1; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.1.0-25.el6_10.18; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 7 Extended Lifecycle Support Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.4-35.el7_9; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 7 Extended Lifecycle Support Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.8.0-36.el7_9.5; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8 Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:21.1.3-20.el8_10.2; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8 Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-28.el8_10.2; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8 Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.15.0-10.el8_10; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.10-5.el8_4; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.11.0-8.el8_4.16; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.10-5.el8_4; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.11.0-8.el8_4.16; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-8.el8_6; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:21.1.3-2.el8_6.7; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.0-6.el8_6.18; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-8.el8_6; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:21.1.3-2.el8_6.7; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.0-6.el8_6.18; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-19.el8_8; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:21.1.3-13.el8_8.1; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.0-15.el8_8.18; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-19.el8_8; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:21.1.3-13.el8_8.1; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.0-15.el8_8.18; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9 Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:24.1.9-4.el9_8.2; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9 Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-34.el9_8.2; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9 Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.15.0-7.el9_8.2; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-21.el9_2; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:21.1.3-10.el9_2.1; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.0-14.el9_2.15; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-29.el9_4; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:22.1.9-8.el9_4.1; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.13.1-8.el9_4.10; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.20.11-34.el9_6; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat `xorg-x11-server-Xwayland` https://access.redhat.com/downloads/content/package-browser/	≥ 0:23.2.7-6.el9_6.1; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat `tigervnc` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.14.1-11.el9_6; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 6 Red Hat `xorg-x11-server` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unknown	ADP: redhat-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (1)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "21.1.23",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "24.1.12",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 7.8 high	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`	CNA: redhat
3.1 / 7.8 high	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`	ADP: redhat-SADP
3.1 / 7.8 high	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`	NVD: [email protected]
3.1 / 7.8 high	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`	NVD: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://access.redhat.com/errata/RHSA-2026:26562CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26566CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26590CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26610CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26709CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28923CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29844CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36083CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36085CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36086CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36087CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36632CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36633CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36634CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36768CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36791CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36792CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36798CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:38502CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:38810CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46377CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46382CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46385CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46392CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46456CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46460CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46473CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:49519CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-50257CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2485382CNA: redhat · issue-tracking, x_refsource_REDHAT
https://gitlab.freedesktop.org/xorg/xserver/-/commit/f5abfb61994471023d8c6470428c8e30c411cc0bCNA: redhat
https://lists.x.org/archives/xorg-announce/2026-June/003702.htmlCNA: redhat
https://redhat.atlassian.net/browse/PSIRTSUPT-16950CNA: redhat
https://access.redhat.com/security/cve/CVE-2026-50257ADP: redhat-SADP · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2485382ADP: redhat-SADP · issue-tracking, x_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50257.jsonADP: redhat-SADP · x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:49519ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46473ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36083ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36798ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26566ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28923ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26709ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26562ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46382ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36792ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46460ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36791ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:38810ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46385ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36768ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:38502ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46377ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36086ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36633ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46456ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36087ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36632ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:46392ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36085ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36634ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29844ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26610ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26590ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26562[email protected]
https://access.redhat.com/errata/RHSA-2026:26566[email protected]
https://access.redhat.com/errata/RHSA-2026:26590[email protected]
https://access.redhat.com/errata/RHSA-2026:26610[email protected]
https://access.redhat.com/errata/RHSA-2026:26709[email protected]
https://access.redhat.com/errata/RHSA-2026:28923[email protected]
https://access.redhat.com/errata/RHSA-2026:29844[email protected]
https://access.redhat.com/errata/RHSA-2026:36083[email protected]
https://access.redhat.com/errata/RHSA-2026:36085[email protected]
https://access.redhat.com/errata/RHSA-2026:36086[email protected]
https://access.redhat.com/errata/RHSA-2026:36087[email protected]
https://access.redhat.com/errata/RHSA-2026:36632[email protected]
https://access.redhat.com/errata/RHSA-2026:36633[email protected]
https://access.redhat.com/errata/RHSA-2026:36634[email protected]
https://access.redhat.com/errata/RHSA-2026:36768[email protected]
https://access.redhat.com/errata/RHSA-2026:36791[email protected]
https://access.redhat.com/errata/RHSA-2026:36792[email protected]
https://access.redhat.com/errata/RHSA-2026:36798[email protected]
https://access.redhat.com/errata/RHSA-2026:38502[email protected]
https://access.redhat.com/errata/RHSA-2026:38810[email protected]
https://access.redhat.com/errata/RHSA-2026:46377[email protected]
https://access.redhat.com/errata/RHSA-2026:46382[email protected]
https://access.redhat.com/errata/RHSA-2026:46385[email protected]
https://access.redhat.com/errata/RHSA-2026:46392[email protected]
https://access.redhat.com/errata/RHSA-2026:46456[email protected]
https://access.redhat.com/errata/RHSA-2026:46460[email protected]
https://access.redhat.com/errata/RHSA-2026:46473[email protected]
https://access.redhat.com/errata/RHSA-2026:49519[email protected]
https://access.redhat.com/security/cve/CVE-2026-50257[email protected] · Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2485382[email protected] · Issue Tracking, Third Party Advisory
https://gitlab.freedesktop.org/xorg/xserver/-/commit/f5abfb61994471023d8c6470428c8e30c411cc0b[email protected] · Patch
https://lists.x.org/archives/xorg-announce/2026-June/003702.html[email protected] · Mailing List, Third Party Advisory
https://redhat.atlassian.net/browse/PSIRTSUPT-16950[email protected] · Permissions Required
https://access.redhat.com/errata/RHSA-2026:265620b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:265660b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:265900b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:266100b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:267090b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:289230b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:298440b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:360830b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:360850b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:360860b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:360870b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:366320b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:366330b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:366340b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:367680b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:367910b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:367920b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:367980b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:385020b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:388100b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:463770b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:463820b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:463850b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:463920b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:464560b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:464600b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:464730b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:495190b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/security/cve/CVE-2026-502570b0ca135-0b70-47e7-9f44-1890c2a1c46c · Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=24853820b0ca135-0b70-47e7-9f44-1890c2a1c46c · Issue Tracking, Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50257.json0b0ca135-0b70-47e7-9f44-1890c2a1c46c

For agents and automation

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