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Vulnerability · Published Feb 25, 2025 · Assigned by redhat

CVE-2025-26594X.org: xwayland: use-after-free of the root cursor

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. The root cursor is referenced in the X server as a global variable. If a client frees the root cursor, the internal reference points to freed memory and causes a use-after-free.

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-2025-26594
Alpine:v3.22xorg-server21.1.16-r0ALPINE-CVE-2025-26594
Alpine:v3.23xorg-server21.1.16-r0ALPINE-CVE-2025-26594
Alpine:v3.24xorg-server21.1.16-r0ALPINE-CVE-2025-26594
Alpine:v3.21xwayland24.1.6-r0ALPINE-CVE-2025-26594
Alpine:v3.22xwayland24.1.6-r0ALPINE-CVE-2025-26594
Alpine:v3.23xwayland24.1.6-r0ALPINE-CVE-2025-26594
Alpine:v3.24xwayland24.1.6-r0ALPINE-CVE-2025-26594
Debian:12xorg-server2:21.1.7-3+deb12u9DSA-5872-1
Debian:12xorg-server2:21.1.7-3+deb12u9DEBIAN-CVE-2025-26594
Debian:13xorg-server2:21.1.16-1DEBIAN-CVE-2025-26594
Debian:14xorg-server2:21.1.16-1DEBIAN-CVE-2025-26594
Debian:12xwaylandno fix listedDEBIAN-CVE-2025-26594
Debian:13xwayland2:24.1.6-1DEBIAN-CVE-2025-26594
Debian:14xwayland2:24.1.6-1DEBIAN-CVE-2025-26594
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-2025-26594
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-2025-26594
Ubuntu:24.04:LTSxorg-server2:21.1.12-1ubuntu1.2USN-7299-1
Ubuntu:25.10xorg-server2:21.1.16-1ubuntu1UBUNTU-CVE-2025-26594
Ubuntu:22.04:LTSxwayland2:22.1.1-1ubuntu0.17UBUNTU-CVE-2025-26594
Ubuntu:22.04:LTSxwayland2:22.1.1-1ubuntu0.17USN-7299-1
Ubuntu:24.04:LTSxwayland2:23.2.6-1ubuntu0.4UBUNTU-CVE-2025-26594
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