# CVE-2025-26600: Xorg: xwayland: use-after-free in playreleasedevents()

Status: published. Published: 2025-02-25. Updated: 2026-11-04.

A use-after-free flaw was found in X.Org and Xwayland. When a device is removed while still frozen, the events queued for that device remain while the device is freed. Replaying the events will cause a use-after-free.

## Remediation

- workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. (source: CNA: redhat)

## Affected products and versions

-  /  (xserver): ≥ 0; < 21.1.16 (affected, semver); ≥ 22.0.0; < 24.1.6 (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (xorg-x11-server-Xwayland): ≥ 0:24.1.5-3.el10_0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 Extended Lifecycle Support  - EXTENSION (tigervnc): ≥ 0:1.1.0-25.el6_10; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support (tigervnc): ≥ 0:1.8.0-36.el7_9; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support (xorg-x11-server): ≥ 0:1.20.4-30.el7_9; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (tigervnc): ≥ 0:1.13.1-15.el8_10; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.2 Advanced Update Support (tigervnc): ≥ 0:1.9.0-15.el8_2.13; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (tigervnc): ≥ 0:1.11.0-8.el8_4.12; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Telecommunications Update Service (tigervnc): ≥ 0:1.11.0-8.el8_4.12; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions (tigervnc): ≥ 0:1.11.0-8.el8_4.12; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (tigervnc): ≥ 0:1.12.0-6.el8_6.13; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Telecommunications Update Service (tigervnc): ≥ 0:1.12.0-6.el8_6.13; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions (tigervnc): ≥ 0:1.12.0-6.el8_6.13; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Extended Update Support (tigervnc): ≥ 0:1.12.0-15.el8_8.12; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (tigervnc): ≥ 0:1.14.1-1.el9_5.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (xorg-x11-server): ≥ 0:1.20.11-28.el9_6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (xorg-x11-server-Xwayland): ≥ 0:23.2.7-3.el9_6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions (tigervnc): ≥ 0:1.11.0-22.el9_0.13; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.2 Extended Update Support (tigervnc): ≥ 0:1.12.0-14.el9_2.10; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support (tigervnc): ≥ 0:1.13.1-8.el9_4.5; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (xorg-x11-server): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (xorg-x11-server): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (xorg-x11-server-Xwayland): Version range not reported. Source: CNA: redhat

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:tigervnc:tigervnc:-:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  },
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "21.1.16",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "24.1.6",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  },
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "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
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]
```

## Severity and prioritization

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: redhat

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: NVD: nvd@nist.gov

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.39% as of 2026-11-04; percentile 33.68%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-416

## Exploit evidence

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

## References

- https://access.redhat.com/errata/RHSA-2025:2500 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:2502 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:2861 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:2862 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:2865 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:2866 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:2873 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:2874 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:2875 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:2879 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:2880 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:3976 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:7163 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:7165 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2025:7458 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2025-26600 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2345252 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://security.netapp.com/advisory/ntap-20250516-0005/ (ADP: CVE)

- https://lists.debian.org/debian-lts-announce/2025/02/msg00036.html (ADP: CVE)

- https://access.redhat.com/errata/RHSA-2025:2500 (secalert@redhat.com; Third Party Advisory)

- https://access.redhat.com/errata/RHSA-2025:2502 (secalert@redhat.com; Third Party Advisory)

- https://access.redhat.com/errata/RHSA-2025:2861 (secalert@redhat.com; Third Party Advisory)

- https://access.redhat.com/errata/RHSA-2025:2862 (secalert@redhat.com; Third Party Advisory)

- https://access.redhat.com/errata/RHSA-2025:2865 (secalert@redhat.com; Third Party Advisory)

- https://access.redhat.com/errata/RHSA-2025:2866 (secalert@redhat.com; Third Party Advisory)

- https://access.redhat.com/errata/RHSA-2025:2873 (secalert@redhat.com; Third Party Advisory)

- https://access.redhat.com/errata/RHSA-2025:2874 (secalert@redhat.com; Third Party Advisory)

- https://access.redhat.com/errata/RHSA-2025:2875 (secalert@redhat.com; Third Party Advisory)

- https://access.redhat.com/errata/RHSA-2025:2879 (secalert@redhat.com; Third Party Advisory)

- https://access.redhat.com/errata/RHSA-2025:2880 (secalert@redhat.com; Third Party Advisory)

- https://access.redhat.com/errata/RHSA-2025:3976 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:7163 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:7165 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2025:7458 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2025-26600 (secalert@redhat.com; Third Party Advisory)

- https://bugzilla.redhat.com/show_bug.cgi?id=2345252 (secalert@redhat.com; Issue Tracking)

- https://lists.debian.org/debian-lts-announce/2025/02/msg00036.html (af854a3a-2127-422b-91ae-364da2661108)

- https://security.netapp.com/advisory/ntap-20250516-0005/ (af854a3a-2127-422b-91ae-364da2661108)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2025-26600; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-26600; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-26600; retrieved 2026-11-04; source updated Not reported

Revision: 46025bc913c3a7849640a878e08fed2a3827ffce1a5e5a702e5e4fa552ecf681

Canonical: https://y2.dev/cve/CVE-2025-26600

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