Description
Local attackers with a X connection able to provide PCX fonts to the X
server xorg-server before 21.2.24 and xwayland before 24.1.13 could
cause a heap buffer overflow via SetFont due to missing glyph boundary checks.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| X.Org | xorg-server | < 21.1.24 | 21.1.24 |
| X.Org | xwayland | < 24.1.13 | 24.1.13 |
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 | 2:21.1.24-1 | — |
| Debian 14 | xwayland | 2:24.1.13-1 | — |
| Debian 13 | xorg-server | 2:21.1.16-1.3+deb13u4 | — |
| Debian 13 | xwayland | 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 25.10 | 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 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | xorg-x11-server-Xwayland +1 | 24.1.9-4.el10_2.3 | RHSA-2026:38489 |
| RHEL 9 | xorg-x11-server +8 | 1.20.11-34.el9_8.3 | RHSA-2026:38486 |
| RHEL 9 | xorg-x11-server-Xwayland +1 | 24.1.9-4.el9_8.3 | RHSA-2026:38490 |
| RHEL 8 | xorg-x11-server +8 | 1.20.11-28.el8_10.3 | RHSA-2026:38487 |
| RHEL 8 | xorg-x11-server-Xwayland | 21.1.3-20.el8_10.3 | RHSA-2026:38488 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | xorg-x11-server-Xwayland +1 | 24.1.5-6.el10_0.2 | RHSA-2026:50100 |
| RHEL 9.6 EUS | xorg-x11-server +8 | 1.20.11-34.el9_6.1 | RHSA-2026:49608 |
| RHEL 9.6 EUS | xorg-x11-server-Xwayland +1 | 23.2.7-6.el9_6.3 | RHSA-2026:50718 |
| RHEL 9.4 E4S | xorg-x11-server +6 | 1.20.11-29.el9_4.1 | RHSA-2026:49516 |
| RHEL 9.4 E4S | xorg-x11-server-Xwayland | 22.1.9-8.el9_4.3 | RHSA-2026:52398 |
| RHEL 9.2 E4S | xorg-x11-server +6 | 1.20.11-21.el9_2.1 | RHSA-2026:49515 |
| RHEL 9.2 E4S | xorg-x11-server-Xwayland | 21.1.3-10.el9_2.2 | RHSA-2026:52397 |
| RHEL 8.8 TUS | xorg-x11-server +6 | 1.20.11-19.el8_8.1 | RHSA-2026:50116 |
| RHEL 8.8 TUS | xorg-x11-server-Xwayland | 21.1.3-13.el8_8.2 | RHSA-2026:52392 |
| RHEL 8.8 E4S | xorg-x11-server +6 | 1.20.11-19.el8_8.1 | RHSA-2026:50116 |
| RHEL 8.8 E4S | xorg-x11-server-Xwayland | 21.1.3-13.el8_8.2 | RHSA-2026:52392 |
| RHEL 8.6 EUS Long Life | xorg-x11-server +6 | 1.20.11-8.el8_6.1 | RHSA-2026:49605 |
| RHEL 8.6 EUS Long Life | xorg-x11-server-Xwayland | 21.1.3-2.el8_6.8 | RHSA-2026:53450 |
| RHEL 8.6 AUS | xorg-x11-server +6 | 1.20.11-8.el8_6.1 | RHSA-2026:49605 |
| RHEL 8.6 AUS | xorg-x11-server-Xwayland | 21.1.3-2.el8_6.8 | RHSA-2026:53450 |
| RHEL 8.4 EUS Long Life | xorg-x11-server +7 | 1.20.10-5.el8_4.1 | RHSA-2026:49606 |
| RHEL 8.4 AUS | xorg-x11-server +7 | 1.20.10-5.el8_4.1 | RHSA-2026:49606 |
| RHEL 7 ELS | xorg-x11-server +9 | 1.20.4-36.el7_9 | RHSA-2026:50117 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | xorg-x11-server-Xwayland +1 | 24.1.9-4.el10_2.3 | ALSA-2026:38489 |
| AlmaLinux 9 | xorg-x11-server-Xdmx +7 | 1.20.11-34.el9_8.3 | ALSA-2026:38486 |
| AlmaLinux 9 | xorg-x11-server-Xwayland +1 | 24.1.9-4.el9_8.3 | ALSA-2026:38490 |
| AlmaLinux 8 | xorg-x11-server-Xdmx +7 | 1.20.11-28.el8_10.3 | ALSA-2026:38487 |
| AlmaLinux 8 | xorg-x11-server-Xwayland | 21.1.3-20.el8_10.3 | ALSA-2026:38488 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | xorg-x11-server-Xwayland | 24.1.9-4.el10_2.3 | RLSA-2026:38489 |
| Rocky Linux 9 | xorg-x11-server | 1.20.11-34.el9_8.3 | RLSA-2026:38486 |
| Rocky Linux 9 | xorg-x11-server-Xwayland | 24.1.9-4.el9_8.3 | RLSA-2026:38490 |
| Rocky Linux 8 | xorg-x11-server | 1.20.11-28.el8_10.3 | RLSA-2026:38487 |
| Rocky Linux 8 | xorg-x11-server-Xwayland | 21.1.3-20.el8_10.3 | RLSA-2026:38488 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | xorg-x11-server | 21.1.15-150700.5.22.1 | SUSE-SU-2026:2788-1 |
| SLES 15 SP7 | xwayland | 24.1.5-150700.3.22.1 | SUSE-SU-2026:2787-1 |
| SLES 15 SP6 | xorg-x11-server | 21.1.11-150600.5.31.1 | SUSE-SU-2026:2786-1 |
| SLES 15 SP5 | xorg-x11-server | 21.1.4-150500.7.52.1 | SUSE-SU-2026:2791-1 |
| SLES 15 SP4 | xorg-x11-server | 1.20.3-150400.38.74.1 | SUSE-SU-2026:2789-1 |
| SLES 12 SP5 | xorg-x11-server | 1.19.6-10.105.1 | SUSE-SU-2026:2792-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | xwayland | 24.1.6-160000.6.1 | SUSE-SU-2026:22617-1 |
| SLES for SAP 15 SP6 | xorg-x11-server | 21.1.11-150600.5.31.1 | SUSE-SU-2026:2786-1 |
| SLES for SAP 15 SP5 | xorg-x11-server | 21.1.4-150500.7.52.1 | SUSE-SU-2026:2791-1 |
| SLES for SAP 15 SP4 | xorg-x11-server | 1.20.3-150400.38.74.1 | SUSE-SU-2026:2789-1 |
| SLES 16.0 | xwayland | 24.1.6-160000.6.1 | SUSE-SU-2026:22617-1 |
| SLE HPC 15 SP5 | xorg-x11-server | 21.1.4-150500.7.52.1 | SUSE-SU-2026:2791-1 |
| SLE HPC 15 SP4 | xorg-x11-server | 1.20.3-150400.38.74.1 | SUSE-SU-2026:2789-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xorg-x11-server | 21.1.21-8.1 | openSUSE-SU-2026:11244-1 |
| openSUSE Tumbleweed | xwayland | 24.1.12-1.1 | openSUSE-SU-2026:11227-1 |
| openSUSE Leap 16.0 | xorg-x11-server | 21.1.15-160000.6.1 | openSUSE-SU-2026:21273-1 |
| openSUSE Leap 16.0 | xwayland | 24.1.6-160000.6.1 | openSUSE-SU-2026:21283-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xorg-server | 21.1.24-r0 | — |
| Alpine v3.24 | xwayland | 24.1.13-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | xorg-x11-server-Xorg +6 | 21.1.13-5.amzn2023.0.11 | ALAS2023-2026-1943 |
| Amazon Linux 2023 | xorg-x11-server-Xwayland +1 | 24.1.3-1.amzn2023.0.6 | ALAS2023-2026-1944 |
| Amazon Linux 2 | xorg-x11-server-Xdmx +8 | 1.20.4-22.amzn2.0.13 | ALAS2-2026-3806 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | xorg-x11-server | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | xorg-x11-server-Xwayland +1 | 24.1.9-4.el10_2.3 | ELSA-2026-38489 |
| Oracle Linux 9 | xorg-x11-server-Xdmx +7 | 1.20.11-34.el9_8.3 | ELSA-2026-38486 |
| Oracle Linux 9 | xorg-x11-server-Xwayland +1 | 24.1.9-4.el9_8.3 | ELSA-2026-38490 |
| Oracle Linux 8 | xorg-x11-server-Xdmx +7 | 1.20.11-28.el8_10.3 | ELSA-2026-38487 |
| Oracle Linux 8 | xorg-x11-server-Xwayland | 21.1.3-20.el8_10.3 | ELSA-2026-38488 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | xorg-server | 21.1.24-r0 | — |
Advisories 48
- ALSA-2026:38490 Important: xorg-x11-server-Xwayland security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:38486 Important: xorg-x11-server security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:38489 Important: xorg-x11-server-Xwayland security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:38487 Important: xorg-x11-server security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:38488 Important: xorg-x11-server-Xwayland security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-2240 X.Org X11 und Xwayland: Mehrere Schwachstellen ermöglichen Codeausführung und DoS BSI CERT-Bund (WID) · Oct 21, 2026
- ELSA-2026-38489 Important: xorg-x11-server-Xwayland security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Sep 1, 2026
- ELSA-2026-38490 Important: xorg-x11-server-Xwayland security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 1, 2026
- ELSA-2026-38487 Important: xorg-x11-server security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 1, 2026
- RHSA-2026:53450 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:52398 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:52397 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:52392 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:50718 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:50117 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:50116 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:50100 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:49608 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:49606 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:49605 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:49516 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:49515 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:38490 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:38488 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:38489 Red Hat Security Advisory: xorg-x11-server-Xwayland security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:38487 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2026:38486 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- ALAS2-2026-3806 Important: xorg-x11-server security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 20, 2026
- ALAS2023-2026-1943 Important: xorg-x11-server security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 20, 2026
- ALAS2023-2026-1944 Important: xorg-x11-server-Xwayland security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 20, 2026
- SUSE-SU-2026:22617-1 Security update for xwayland SUSE / openSUSE Security Updates · Jul 17, 2026
- RLSA-2026:38489 Important: xorg-x11-server-Xwayland security update Rocky Linux Security Advisories · Jul 14, 2026
- RLSA-2026:38486 Important: xorg-x11-server security update Rocky Linux Security Advisories · Jul 14, 2026
- RLSA-2026:38490 Important: xorg-x11-server-Xwayland security update Rocky Linux Security Advisories · Jul 14, 2026
- RLSA-2026:38487 Important: xorg-x11-server security update Rocky Linux Security Advisories · Jul 14, 2026
- RLSA-2026:38488 Important: xorg-x11-server-Xwayland security update Rocky Linux Security Advisories · Jul 14, 2026
- openSUSE-SU-2026:21283-1 Security update for xwayland SUSE / openSUSE Security Updates · Jul 13, 2026
- ELSA-2026-38488 Important: xorg-x11-server-Xwayland security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 13, 2026
- ELSA-2026-38486 Important: xorg-x11-server security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 13, 2026
- openSUSE-SU-2026:21273-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Jul 11, 2026
- openSUSE-SU-2026:11244-1 xorg-x11-server-21.1.21-8.1 on GA media SUSE / openSUSE Security Updates · Jul 10, 2026
- openSUSE-SU-2026:11227-1 xwayland-24.1.12-1.1 on GA media SUSE / openSUSE Security Updates · Jul 9, 2026
- SUSE-SU-2026:2786-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Jul 9, 2026
- SUSE-SU-2026:2787-1 Security update for xwayland SUSE / openSUSE Security Updates · Jul 9, 2026
- SUSE-SU-2026:2788-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Jul 9, 2026
- SUSE-SU-2026:2789-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Jul 9, 2026
- SUSE-SU-2026:2791-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Jul 9, 2026
- SUSE-SU-2026:2792-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Jul 9, 2026