Description
A use-after-free in present_clear_window_notifies() in the X.org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by malicious X clients to crash or potentially execute code in the X server context.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| X.org | xorg-x11-server | < 21.1.25 | 21.1.25 |
| x.org | xwayland | < 24.1.14 | 24.1.14 |
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 | 2:21.1.25-1 | — |
| Debian 14 | xwayland | 2:24.1.14-1 | — |
| Debian 13 | xwayland +1 | No fix yet | — |
| Debian 12 | xwayland +1 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | xwayland +1 | No fix yet | — |
| Ubuntu 26.04 LTS | xwayland +1 | No fix yet | — |
| Ubuntu 24.04 LTS | xwayland +1 | No fix yet | — |
| Ubuntu 22.04 LTS | xwayland +1 | No fix yet | — |
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 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | xorg-x11-server | 21.1.15-150700.5.25.1 | SUSE-SU-2026:4646-1 |
| SLES 15 SP7 | xwayland | 24.1.5-150700.3.25.1 | SUSE-SU-2026:4835-1 |
| SLES 15 SP6 | xorg-x11-server | 21.1.11-150600.5.34.1 | SUSE-SU-2026:4647-1 |
| SLES 15 SP5 | xorg-x11-server | 21.1.4-150500.7.55.1 | SUSE-SU-2026:4645-1 |
| SLES 15 SP4 | xorg-x11-server | 1.20.3-150400.38.77.1 | SUSE-SU-2026:4663-1 |
| SLES 12 SP5 | xorg-x11-server | 1.19.6-10.108.1 | SUSE-SU-2026:4636-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | xwayland | 24.1.6-160000.7.1 | SUSE-SU-2026:24230-1 |
| SLES for SAP 15 SP6 | xorg-x11-server | 21.1.11-150600.5.34.1 | SUSE-SU-2026:4647-1 |
| SLES for SAP 15 SP5 | xorg-x11-server | 21.1.4-150500.7.55.1 | SUSE-SU-2026:4645-1 |
| SLES for SAP 15 SP4 | xorg-x11-server | 1.20.3-150400.38.77.1 | SUSE-SU-2026:4663-1 |
| SLES 16.0 | xwayland | 24.1.6-160000.7.1 | SUSE-SU-2026:24230-1 |
| SLE HPC 15 SP5 | xorg-x11-server | 21.1.4-150500.7.55.1 | SUSE-SU-2026:4645-1 |
| SLE HPC 15 SP4 | xorg-x11-server | 1.20.3-150400.38.77.1 | SUSE-SU-2026:4663-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xorg-x11-server | 21.1.24-2.1 | openSUSE-SU-2026:12104-1 |
| openSUSE Tumbleweed | xwayland | 24.1.13-2.1 | openSUSE-SU-2026:12105-1 |
| openSUSE Leap 16.0 | xwayland | 24.1.6-160000.7.1 | openSUSE-SU-2026:22085-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xorg-server | 21.1.25-r0 | — |
| Alpine v3.24 | xwayland | 24.1.14-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | tigervnc +6 | 1.14.1-3.amzn2023.0.7 | ALAS2023-2026-3262 |
| Amazon Linux 2023 | xorg-x11-server-Xorg +6 | 21.1.13-5.amzn2023.0.12 | ALAS2023-2026-3260 |
| Amazon Linux 2023 | xorg-x11-server-Xwayland +1 | 24.1.3-1.amzn2023.0.7 | ALAS2023-2026-3261 |
| Amazon Linux 2 | tigervnc +6 | 1.8.0-24.amzn2.0.11 | ALAS2-2026-4013 |
| Amazon Linux 2 | xorg-x11-server-Xdmx +8 | 1.20.4-22.amzn2.0.14 | ALAS2-2026-4014 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | wayland +1 | No fix yet | — |
| Azure Linux 3 | xorg-x11-server-Xwayland | 24.1.14-1 | — |
Advisories 16
- WID-SEC-2026-3787 X.Org X11 und Xwayland: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- ALAS2-2026-4014 Important: xorg-x11-server security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- ALAS2023-2026-3260 Important: xorg-x11-server security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- ALAS2023-2026-3261 Important: xorg-x11-server-Xwayland security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- ALAS2023-2026-3262 Important: tigervnc security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- ALAS2-2026-4013 Important: tigervnc security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- SUSE-SU-2026:4835-1 Security update for xwayland SUSE / openSUSE Security Updates · Oct 22, 2026
- SUSE-SU-2026:24230-1 Security update for xwayland SUSE / openSUSE Security Updates · Oct 21, 2026
- openSUSE-SU-2026:22085-1 Security update for xwayland SUSE / openSUSE Security Updates · Oct 19, 2026
- SUSE-SU-2026:4647-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Oct 14, 2026
- SUSE-SU-2026:4663-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Oct 14, 2026
- SUSE-SU-2026:4645-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Oct 14, 2026
- SUSE-SU-2026:4646-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Oct 14, 2026
- SUSE-SU-2026:4636-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Oct 13, 2026
- openSUSE-SU-2026:12104-1 xorg-x11-server-21.1.24-2.1 on GA media SUSE / openSUSE Security Updates · Oct 11, 2026
- openSUSE-SU-2026:12105-1 xwayland-24.1.13-2.1 on GA media SUSE / openSUSE Security Updates · Oct 11, 2026