Public vulnerability disclosure
CVE-2025-26601
Xorg: xwayland: use-after-free in syncinittrigger()
publishedCWE-416
A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, changing the trigger values as requested, and eventually, SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not adding the new sync object, possibly causing a use-after-free when the alarm eventually triggers.
Technical severity7.8 highCVSS 3.1 · CNA: redhat
Published2025-02-25Source updated 2026-11-04
Collected2026-11-042 attributed sources
Fixes and workarounds
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: redhatAffected products and versions
| Product | Versions | Authority |
|---|---|---|
xserver
https://gitlab.freedesktop.org/xorg/xserver/ |
≥ 0; < 21.1.16 (affected, semver) ≥ 22.0.0; < 24.1.6 (affected, semver) Other versions: unaffected |
CNA: redhat |
| Red Hat Enterprise Linux 10 Red Hat xorg-x11-server-Xwayland
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:24.1.5-3.el10_0; < * (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; < * (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; < * (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/ |
≥ 0:1.20.4-30.el7_9; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8 Red Hat tigervnc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.13.1-15.el8_10; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.2 Advanced Update Support Red Hat tigervnc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.9.0-15.el8_2.13; < * (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_4.12; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.4 Telecommunications Update Service Red Hat tigervnc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.11.0-8.el8_4.12; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions Red Hat tigervnc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.11.0-8.el8_4.12; < * (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_6.13; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.6 Telecommunications Update Service Red Hat tigervnc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.12.0-6.el8_6.13; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions Red Hat tigervnc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.12.0-6.el8_6.13; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.8 Extended Update Support Red Hat tigervnc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.12.0-15.el8_8.12; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9 Red Hat tigervnc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.14.1-1.el9_5.1; < * (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/ |
≥ 0:1.20.11-28.el9_6; < * (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/ |
≥ 0:23.2.7-3.el9_6; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Red Hat tigervnc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.11.0-22.el9_0.13; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.2 Extended Update Support Red Hat tigervnc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.12.0-14.el9_2.10; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.4 Extended Update Support Red Hat tigervnc
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.13.1-8.el9_4.5; < * (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 8 Red Hat xorg-x11-server
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat Enterprise Linux 8 Red Hat xorg-x11-server-Xwayland
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| 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 |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://access.redhat.com/errata/RHSA-2025:2500CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:2502CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:2861CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:2862CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:2865CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:2866CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:2873CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:2874CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:2875CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:2879CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:2880CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:3976CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:7163CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:7165CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2025:7458CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2025-26601CNA: redhat · vdb-entry, x_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2345251CNA: redhat · issue-tracking, x_refsource_REDHAT
- https://security.netapp.com/advisory/ntap-20250516-0004/ADP: CVE
- https://lists.debian.org/debian-lts-announce/2025/02/msg00036.htmlADP: CVE
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