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Vulnerability · Published Feb 25, 2025 · Assigned by redhat

CVE-2025-26601Xorg: xwayland: use-after-free in syncinittrigger()

High 7.8

In plain English

A high-severity use-after-free in xserver. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.4%top 66.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8tigervnc1.13.1-15.el8_10ALSA-2025:2502
AlmaLinux:9tigervnc1.14.1-1.el9_5.1ALSA-2025:2500
AlmaLinux:8tigervnc-icons1.13.1-15.el8_10ALSA-2025:2502
AlmaLinux:9tigervnc-icons1.14.1-1.el9_5.1ALSA-2025:2500
AlmaLinux:8tigervnc-license1.13.1-15.el8_10ALSA-2025:2502
AlmaLinux:9tigervnc-license1.14.1-1.el9_5.1ALSA-2025:2500
AlmaLinux:8tigervnc-selinux1.13.1-15.el8_10ALSA-2025:2502
AlmaLinux:9tigervnc-selinux1.14.1-1.el9_5.1ALSA-2025:2500
AlmaLinux:8tigervnc-server1.13.1-15.el8_10ALSA-2025:2502
AlmaLinux:9tigervnc-server1.14.1-1.el9_5.1ALSA-2025:2500
AlmaLinux:8tigervnc-server-minimal1.13.1-15.el8_10ALSA-2025:2502
AlmaLinux:9tigervnc-server-minimal1.14.1-1.el9_5.1ALSA-2025:2500
AlmaLinux:8tigervnc-server-module1.13.1-15.el8_10ALSA-2025:2502
AlmaLinux:9tigervnc-server-module1.14.1-1.el9_5.1ALSA-2025:2500
AlmaLinux:9xorg-x11-server-Xdmx1.20.11-28.el9_6ALSA-2025:7163
AlmaLinux:9xorg-x11-server-Xephyr1.20.11-28.el9_6ALSA-2025:7163
AlmaLinux:9xorg-x11-server-Xnest1.20.11-28.el9_6ALSA-2025:7163
AlmaLinux:9xorg-x11-server-Xorg1.20.11-28.el9_6ALSA-2025:7163
AlmaLinux:9xorg-x11-server-Xvfb1.20.11-28.el9_6ALSA-2025:7163
AlmaLinux:9xorg-x11-server-Xwayland23.2.7-3.el9_6ALSA-2025:7165
AlmaLinux:9xorg-x11-server-Xwayland-devel23.2.7-3.el9_6ALSA-2025:7165
AlmaLinux:9xorg-x11-server-common1.20.11-28.el9_6ALSA-2025:7163
AlmaLinux:9xorg-x11-server-devel1.20.11-28.el9_6ALSA-2025:7163
AlmaLinux:9xorg-x11-server-source1.20.11-28.el9_6ALSA-2025:7163
Alpine:v3.21xorg-server21.1.16-r0ALPINE-CVE-2025-26601
Alpine:v3.22xorg-server21.1.16-r0ALPINE-CVE-2025-26601
Alpine:v3.23xorg-server21.1.16-r0ALPINE-CVE-2025-26601
Alpine:v3.24xorg-server21.1.16-r0ALPINE-CVE-2025-26601
Alpine:v3.21xwayland24.1.6-r0ALPINE-CVE-2025-26601
Alpine:v3.22xwayland24.1.6-r0ALPINE-CVE-2025-26601
Alpine:v3.23xwayland24.1.6-r0ALPINE-CVE-2025-26601
Alpine:v3.24xwayland24.1.6-r0ALPINE-CVE-2025-26601
Debian:12xorg-server2:21.1.7-3+deb12u9DSA-5872-1
Debian:12xorg-server2:21.1.7-3+deb12u9DEBIAN-CVE-2025-26601
Debian:13xorg-server2:21.1.16-1DEBIAN-CVE-2025-26601
Debian:14xorg-server2:21.1.16-1DEBIAN-CVE-2025-26601
Debian:12xwaylandno fix listedDEBIAN-CVE-2025-26601
Debian:13xwayland2:24.1.6-1DEBIAN-CVE-2025-26601
Debian:14xwayland2:24.1.6-1DEBIAN-CVE-2025-26601
Rocky Linux:8tigervnc0:1.13.1-15.el8_10RLSA-2025:2502
Rocky Linux:9tigervnc0:1.14.1-1.el9_5.1RLSA-2025:2500
Rocky Linux:9xorg-x11-server0:1.20.11-28.el9_6RLSA-2025:7163
Rocky Linux:10xorg-x11-server-Xwayland0:24.1.5-3.el10_0RLSA-2025:7458
Rocky Linux:9xorg-x11-server-Xwayland0:23.2.7-3.el9_6RLSA-2025:7165
Ubuntu:22.04:LTSxorg-server2:21.1.4-2ubuntu1.7~22.04.13UBUNTU-CVE-2025-26601
Ubuntu:22.04:LTSxorg-server2:21.1.4-2ubuntu1.7~22.04.13USN-7299-1
Ubuntu:24.04:LTSxorg-server2:21.1.12-1ubuntu1.2UBUNTU-CVE-2025-26601
Ubuntu:24.04:LTSxorg-server2:21.1.12-1ubuntu1.2USN-7299-1
Ubuntu:25.10xorg-server2:21.1.16-1ubuntu1UBUNTU-CVE-2025-26601
Ubuntu:22.04:LTSxwayland2:22.1.1-1ubuntu0.17UBUNTU-CVE-2025-26601
Ubuntu:22.04:LTSxwayland2:22.1.1-1ubuntu0.17USN-7299-1
Ubuntu:24.04:LTSxwayland2:23.2.6-1ubuntu0.4UBUNTU-CVE-2025-26601
Ubuntu:24.04:LTSxwayland2:23.2.6-1ubuntu0.4USN-7299-1

Affected products (as reported)

VendorProductVersions
xserver 0 – before 21.1.1622.0.0 – before 24.1.6
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references

Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References