Description
A flaw was found in the XFIXES extension. The XFixesSetClientDisconnectMode handler does not validate the request length, allowing a client to read unintended memory from previous requests.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| X.Org | xwayland | < 24.1.7 | 24.1.7 |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
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 | 2:21.1.16-1.2 | — |
| Debian 14 | xwayland | 2:24.1.8-1 | — |
| Debian 13 | xorg-server | 2:21.1.16-1.2 | — |
| Debian 13 | xwayland | No fix yet | — |
| Debian 12 | xorg-server | 2:21.1.7-3+deb12u10 | DSA-5947-1 |
| Debian 12 | xwayland | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | xorg-server | 2:21.1.18-1ubuntu1 | — |
| Ubuntu 26.04 LTS | xwayland | 2:24.1.6-1ubuntu1 | — |
| Ubuntu 25.10 | xorg-server | 2:21.1.18-1ubuntu1 | — |
| Ubuntu 25.10 | xwayland | 2:24.1.6-1ubuntu1 | — |
| Ubuntu 24.04 LTS | xorg-server | 2:21.1.12-1ubuntu1.4 | USN-7573-1 |
| Ubuntu 24.04 LTS | xwayland | 2:23.2.6-1ubuntu0.6 | USN-7573-1 |
| Ubuntu 22.04 LTS | xorg-server | 2:21.1.4-2ubuntu1.7~22.04.15 | USN-7573-1 |
| Ubuntu 22.04 LTS | xwayland | 2:22.1.1-1ubuntu0.19 | USN-7573-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | xorg-server | No fix yet | — |
| Ubuntu Pro 18.04 LTS | xorg-server +1 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | xorg-server +1 | No fix yet | — |
| 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 | 24.1.5-4.el10_0 | RHSA-2025:9304 |
| RHEL 9 | xorg-x11-server +8 | 1.20.11-31.el9_6 | RHSA-2025:9303 |
| RHEL 9 | xorg-x11-server-Xwayland +1 | 23.2.7-4.el9_6 | RHSA-2025:9303 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | xorg-x11-server-Xwayland | 22.1.9-6.el9_4 | RHSA-2025:10258 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | xorg-x11-server-Xwayland +1 | 24.1.5-4.el10_0 | ALSA-2025:9304 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | xorg-x11-server-Xwayland | 24.1.5-4.el10_0 | RLSA-2025:9304 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | xorg-x11-server | 21.1.15-150700.5.3.1 | SUSE-SU-2025:01981-1 |
| SLES 15 SP7 | xwayland | 24.1.5-150700.3.3.1 | SUSE-SU-2025:01975-1 |
| SLES 15 SP6 | xorg-x11-server | 21.1.11-150600.5.12.1 | SUSE-SU-2025:01980-1 |
| SLES 15 SP6 | xwayland | 24.1.1-150600.5.12.1 | SUSE-SU-2025:01974-1 |
| SLES 15 SP5 | xorg-x11-server | 21.1.4-150500.7.35.1 | SUSE-SU-2025:01979-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | xorg-x11-server | 21.1.4-150500.7.35.1 | SUSE-SU-2025:01979-1 |
| SLE HPC 15 SP5 | xorg-x11-server | 21.1.4-150500.7.35.1 | SUSE-SU-2025:01979-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xorg-x11-server | 21.1.15-6.1 | openSUSE-SU-2025:15310-1 |
| openSUSE Tumbleweed | xwayland | 24.1.8-1.1 | openSUSE-SU-2025:15311-1 |
| openSUSE Leap 15.6 | xorg-x11-server | 21.1.11-150600.5.12.1 | SUSE-SU-2025:01980-1 |
| openSUSE Leap 15.6 | xwayland | 24.1.1-150600.5.12.1 | SUSE-SU-2025:01974-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xorg-server | 21.1.17-r0 | — |
| Alpine v3.24 | xwayland | 24.1.7-r0 | — |
| Alpine v3.23 | xorg-server | 21.1.17-r0 | — |
| Alpine v3.23 | xwayland | 24.1.7-r0 | — |
| Alpine v3.22 | xorg-server | 21.1.17-r0 | — |
| Alpine v3.22 | xwayland | 24.1.7-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | tigervnc +6 | 1.14.1-3.amzn2023.0.2 | ALAS2023-2025-1060 |
| Amazon Linux 2023 | xorg-x11-server-Xorg +6 | 21.1.13-5.amzn2023.0.6 | ALAS2023-2025-1061 |
| Amazon Linux 2023 | xorg-x11-server-Xwayland +1 | 24.1.3-1.amzn2023.0.2 | ALAS2023-2025-1062 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | xorg-x11-server-Xwayland | 24.1.6-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | xorg-x11-server-Xwayland +1 | 24.1.5-4.el10_0 | ELSA-2025-9304 |
Advisories 19
- ALSA-2025:9304 Important: xorg-x11-server-Xwayland security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2025-1352 X.Org X11 und Xwayland: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 25, 2026
- RHSA-2025:9303 Red Hat Security Advisory: xorg-x11-server and xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2025:9304 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2025:10258 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- USN-7573-1 xorg-server, xwayland vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2025:15310-1 xorg-x11-server-21.1.15-6.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15311-1 xwayland-24.1.8-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5947-1 xorg-server - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:01981-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:01979-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:01974-1 Security update for xwayland SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:01980-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:01975-1 Security update for xwayland SUSE / openSUSE Security Updates · Feb 4, 2026
- RLSA-2025:9304 Important: xorg-x11-server-Xwayland security update Rocky Linux Security Advisories · Oct 8, 2025
- ALAS2023-2025-1060 Moderate: tigervnc security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 10, 2025
- ALAS2023-2025-1061 Moderate: xorg-x11-server security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 10, 2025
- ALAS2023-2025-1062 Moderate: xorg-x11-server-Xwayland security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 10, 2025
- ELSA-2025-9304 Important: xorg-x11-server-Xwayland security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 26, 2025
References
- RHSA-2025:10258 vendor-advisory
- RHSA-2025:9303 vendor-advisory
- RHSA-2025:9304 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2025-49177 vdb-entry
- RHBZ#2369955 issue-tracking
- https://gitlab.freedesktop.org/xorg/xserver/-/commit/ab02fb96b1c701c3bb47617d965522c34befa6af
- https://www.x.org/wiki/Development/Security/