Description
A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | xserver | < 21.1.16, 22.0.0 – < 24.1.6 | 21.1.16 |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | — | — |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 8.2 Advanced Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Telecommunications Update Service | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9.2 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | xorg-server | 2:21.1.16-1 | — |
| Debian 14 | xwayland | 2:24.1.6-1 | — |
| Debian 13 | xorg-server | 2:21.1.16-1 | — |
| Debian 13 | xwayland | 2:24.1.6-1 | — |
| Debian 12 | xorg-server | 2:21.1.7-3+deb12u9 | DSA-5872-1 |
| Debian 12 | xwayland | No fix yet | — |
| Debian 11 | xorg-server | 2:1.20.11-1+deb11u15 | DLA-4072-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | xorg-server | 2:21.1.16-1ubuntu1 | — |
| Ubuntu 24.04 LTS | xorg-server | 2:21.1.12-1ubuntu1.2 | USN-7299-1 |
| Ubuntu 24.04 LTS | xwayland | 2:23.2.6-1ubuntu0.4 | USN-7299-1 |
| Ubuntu 22.04 LTS | xorg-server | 2:21.1.4-2ubuntu1.7~22.04.13 | USN-7299-1 |
| Ubuntu 22.04 LTS | xwayland | 2:22.1.1-1ubuntu0.17 | USN-7299-1 |
| Ubuntu 20.04 LTS | xorg-server | 2:1.20.13-1ubuntu1~20.04.19 | USN-7299-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | xorg-server | 2:1.19.6-1ubuntu4.15+esm12 | USN-7299-4, USN-7299-2 |
| Ubuntu Pro 18.04 LTS | xorg-server-hwe-18.04 | 2:1.20.8-2ubuntu2.2~18.04.11+esm4 | USN-7299-4, USN-7299-2 |
| Ubuntu Pro 16.04 LTS | xorg-server | 2:1.18.4-0ubuntu0.12+esm17 | USN-7299-4, USN-7299-2 |
| Ubuntu Pro 16.04 LTS | xorg-server-hwe-16.04 | 2:1.19.6-1ubuntu4.1~16.04.6+esm9 | USN-7299-4, USN-7299-2 |
| Ubuntu Pro 14.04 LTS | xorg-server | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | xorg-x11-server-Xwayland +1 | 24.1.5-3.el10_0 | RHSA-2025:7458 |
| RHEL 9 | tigervnc +6 | 1.14.1-1.el9_5.1 | RHSA-2025:2500 |
| RHEL 9 | xorg-x11-server +8 | 1.20.11-28.el9_6 | RHSA-2025:7163 |
| RHEL 9 | xorg-x11-server-Xwayland +1 | 23.2.7-3.el9_6 | RHSA-2025:7165 |
| RHEL 8 | tigervnc +6 | 1.13.1-15.el8_10 | RHSA-2025:2502 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | tigervnc +6 | 1.13.1-8.el9_4.5 | RHSA-2025:2875 |
| RHEL 9.2 EUS | tigervnc +6 | 1.12.0-14.el9_2.10 | RHSA-2025:2874 |
| RHEL 9.0 E4S | tigervnc +6 | 1.11.0-22.el9_0.13 | RHSA-2025:2873 |
| RHEL 8.8 EUS | tigervnc +6 | 1.12.0-15.el8_8.12 | RHSA-2025:2862 |
| RHEL 8.6 TUS | tigervnc +6 | 1.12.0-6.el8_6.13 | RHSA-2025:2880 |
| RHEL 8.6 E4S | tigervnc +6 | 1.12.0-6.el8_6.13 | RHSA-2025:2880 |
| RHEL 8.6 AUS | tigervnc +6 | 1.12.0-6.el8_6.13 | RHSA-2025:2880 |
| RHEL 8.4 TUS | tigervnc +6 | 1.11.0-8.el8_4.12 | RHSA-2025:2865 |
| RHEL 8.4 E4S | tigervnc +6 | 1.11.0-8.el8_4.12 | RHSA-2025:2865 |
| RHEL 8.4 AUS | tigervnc +6 | 1.11.0-8.el8_4.12 | RHSA-2025:2865 |
| RHEL 8.2 AUS | tigervnc +6 | 1.9.0-15.el8_2.13 | RHSA-2025:2866 |
| RHEL 7 ELS | tigervnc +6 | 1.8.0-36.el7_9 | RHSA-2025:2861 |
| RHEL 7 ELS | xorg-x11-server +9 | 1.20.4-30.el7_9 | RHSA-2025:2879 |
| RHEL 6 ELS | tigervnc +3 | 1.1.0-25.el6_10 | RHSA-2025:3976 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | tigervnc +6 | 1.14.1-1.el9_5.1 | ALSA-2025:2500 |
| AlmaLinux 9 | xorg-x11-server-Xdmx +7 | 1.20.11-28.el9_6 | ALSA-2025:7163 |
| AlmaLinux 9 | xorg-x11-server-Xwayland +1 | 23.2.7-3.el9_6 | ALSA-2025:7165 |
| AlmaLinux 8 | tigervnc +6 | 1.13.1-15.el8_10 | ALSA-2025:2502 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | xorg-x11-server-Xwayland | 24.1.5-3.el10_0 | RLSA-2025:7458 |
| Rocky Linux 9 | tigervnc | 1.14.1-1.el9_5.1 | RLSA-2025:2500 |
| Rocky Linux 9 | xorg-x11-server | 1.20.11-28.el9_6 | RLSA-2025:7163 |
| Rocky Linux 9 | xorg-x11-server-Xwayland | 23.2.7-3.el9_6 | RLSA-2025:7165 |
| Rocky Linux 8 | tigervnc | 1.13.1-15.el8_10 | RLSA-2025:2502 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | xorg-x11-server | 1.20.3-150200.22.5.102.1 | SUSE-SU-2025:0733-1, SUSE-SU-2025:0730-1 |
| SLES 15 SP6 | xwayland | 24.1.1-150600.5.9.1 | SUSE-SU-2025:0729-1 |
| SLES 15 SP5 | xorg-x11-server | 21.1.4-150500.7.32.1 | SUSE-SU-2025:0731-1 |
| SLES 15 SP4 | xorg-x11-server | 1.20.3-150400.38.54.1 | SUSE-SU-2025:0732-1 |
| SLES 15 SP3 | xorg-x11-server | 1.20.3-150200.22.5.102.1 | SUSE-SU-2025:0733-1 |
| SLES 12 SP5 | xorg-x11-server | 1.19.6-10.80.1 | SUSE-SU-2025:0734-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | xorg-x11-server | 21.1.4-150500.7.32.1 | SUSE-SU-2025:0731-1 |
| SLES for SAP 15 SP4 | xorg-x11-server | 1.20.3-150400.38.54.1 | SUSE-SU-2025:0732-1 |
| SLES for SAP 15 SP3 | xorg-x11-server | 1.20.3-150200.22.5.102.1 | SUSE-SU-2025:0733-1 |
| SLE HPC 15 SP5 | xorg-x11-server | 21.1.4-150500.7.32.1 | SUSE-SU-2025:0731-1 |
| SLE HPC 15 SP4 | xorg-x11-server | 1.20.3-150400.38.54.1 | SUSE-SU-2025:0732-1 |
| SLE HPC 15 SP3 | xorg-x11-server | 1.20.3-150200.22.5.102.1 | SUSE-SU-2025:0733-1 |
| SUSE Manager Server 4.3 | xorg-x11-server | 1.20.3-150400.38.54.1 | SUSE-SU-2025:0732-1 |
| SUSE Manager Proxy 4.3 | xorg-x11-server | 1.20.3-150400.38.54.1 | SUSE-SU-2025:0732-1 |
| SUSE Enterprise Storage 7.1 | xorg-x11-server | 1.20.3-150200.22.5.102.1 | SUSE-SU-2025:0733-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xorg-x11-server | 21.1.15-2.1 | openSUSE-SU-2025:14841-1 |
| openSUSE Tumbleweed | xwayland | 24.1.5-2.1 | openSUSE-SU-2025:14842-1 |
| openSUSE Leap 15.6 | xorg-x11-server | 21.1.11-150600.5.6.1 | SUSE-SU-2025:0730-1 |
| openSUSE Leap 15.6 | xwayland | 24.1.1-150600.5.9.1 | SUSE-SU-2025:0729-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | xorg-x11-server-Xorg +6 | 21.1.13-5.amzn2023.0.3 | ALAS2023-2025-892 |
| Amazon Linux 2023 | xorg-x11-server-Xwayland +1 | 24.1.3-1.amzn2023.0.1 | ALAS2023-2025-895 |
| Amazon Linux 2 | xorg-x11-server-Xdmx +8 | 1.20.4-22.amzn2.0.8 | ALAS2-2025-2791 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | xorg-x11-server | No fix yet | — |
| Azure Linux 3 | xorg-x11-server-Xwayland | 24.1.6-1 | — |
| Azure Linux 2 (CBL-Mariner) | xorg-x11-server | 1.20.10-15 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | xorg-x11-server-Xwayland +1 | 24.1.5-4.el10_0 | ELSA-2025-7458 |
| Oracle Linux 9 | tigervnc +6 | 1.14.1-1.el9_5.1 | ELSA-2025-2500 |
| Oracle Linux 9 | xorg-x11-server-Xdmx +7 | 1.20.11-28.el9_6 | ELSA-2025-7163 |
| Oracle Linux 9 | xorg-x11-server-Xwayland +1 | 23.2.7-3.el9_6 | ELSA-2025-7165 |
| Oracle Linux 8 | tigervnc +6 | 1.13.1-15.el8_10 | ELSA-2025-2502 |
| Oracle Linux 7 | tigervnc +6 | 1.8.0-33.0.5.el7_9 | ELSA-2025-2861 |
| Oracle Linux 7 | xorg-x11-server-Xdmx +8 | 1.20.4-29.0.1.el7_9 | ELSA-2025-2879 |
Advisories 48
- ALSA-2025:2500 Important: tigervnc security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:7163 Moderate: xorg-x11-server security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:7165 Moderate: xorg-x11-server-Xwayland security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:2502 Important: tigervnc security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2025-0435 X.Org X11: Mehrere Schwachstellen ermöglichen nicht näher spezifizierte Auswirkungen, möglicherweise Codeausführung BSI CERT-Bund (WID) · Sep 21, 2026
- RHSA-2025:7458 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:7163 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:7165 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:3976 Red Hat Security Advisory: tigervnc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:2879 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:2880 Red Hat Security Advisory: tigervnc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:2875 Red Hat Security Advisory: tigervnc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:2873 Red Hat Security Advisory: tigervnc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:2874 Red Hat Security Advisory: tigervnc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:2866 Red Hat Security Advisory: tigervnc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:2865 Red Hat Security Advisory: tigervnc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:2862 Red Hat Security Advisory: tigervnc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:2861 Red Hat Security Advisory: tigervnc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:2502 Red Hat Security Advisory: tigervnc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:2500 Red Hat Security Advisory: tigervnc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- USN-7299-2 xorg-server, xorg-server-hwe-16.04, xorg-server-hwe-18.04 vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-7299-4 xorg-server, xorg-server-hwe-16.04, xorg-server-hwe-18.04 regression Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-7299-1 xorg-server, xwayland vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5872-1 xorg-server - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4072-1 xorg-server - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:0732-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0734-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0731-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0730-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14841-1 xorg-x11-server-21.1.15-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14842-1 xwayland-24.1.5-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0729-1 Security update for xwayland SUSE / openSUSE Security Updates · Feb 4, 2026
- RLSA-2025:7458 Important: xorg-x11-server-Xwayland security update Rocky Linux Security Advisories · Oct 8, 2025
- RLSA-2025:7165 Moderate: xorg-x11-server-Xwayland security update Rocky Linux Security Advisories · Oct 7, 2025
- RLSA-2025:7163 Moderate: xorg-x11-server security update Rocky Linux Security Advisories · Oct 4, 2025
- ELSA-2025-7458 Important: xorg-x11-server-Xwayland security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 7, 2025
- ELSA-2025-7165 Moderate: xorg-x11-server-Xwayland security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 16, 2025
- ELSA-2025-7163 Moderate: xorg-x11-server security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 16, 2025
- RLSA-2025:2500 Important: tigervnc security update Rocky Linux Security Advisories · May 7, 2025
- RLSA-2025:2502 Important: tigervnc security update Rocky Linux Security Advisories · May 7, 2025
- SUSE-SU-2025:0733-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2025-2879 Important: xorg-x11-server security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 7, 2025
- ELSA-2025-2861 Important: tigervnc security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 31, 2025
- ALAS2023-2025-895 Important: xorg-x11-server-Xwayland security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Mar 26, 2025
- ALAS2023-2025-892 Important: xorg-x11-server security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Mar 26, 2025
- ALAS2-2025-2791 Important: xorg-x11-server security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Mar 25, 2025
- ELSA-2025-2500 Important: tigervnc security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Mar 10, 2025
- ELSA-2025-2502 Important: tigervnc security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 10, 2025
References
- RHSA-2025:2500 vendor-advisory
- RHSA-2025:2502 vendor-advisory
- RHSA-2025:2861 vendor-advisory
- RHSA-2025:2862 vendor-advisory
- RHSA-2025:2865 vendor-advisory
- RHSA-2025:2866 vendor-advisory
- RHSA-2025:2873 vendor-advisory
- RHSA-2025:2874 vendor-advisory
- RHSA-2025:2875 vendor-advisory
- RHSA-2025:2879 vendor-advisory
- RHSA-2025:2880 vendor-advisory
- RHSA-2025:3976 vendor-advisory
- RHSA-2025:7163 vendor-advisory
- RHSA-2025:7165 vendor-advisory
- RHSA-2025:7458 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2025-26596 vdb-entry
- RHBZ#2345256 issue-tracking