Description
A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| x.org | libX11 | < 1.8.14 | 1.8.14 |
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 | libx11 | 2:1.8.14-1 | — |
| Debian 13 | libx11 | No fix yet | — |
| Debian 12 | libx11 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libx11 | No fix yet | — |
| Ubuntu 26.04 LTS | libx11 | 2:1.8.13-1ubuntu0.1 | USN-8913-1 |
| Ubuntu 24.04 LTS | libx11 | 2:1.8.7-1ubuntu0.1 | USN-8913-1 |
| Ubuntu 22.04 LTS | libx11 | 2:1.7.5-1ubuntu0.4 | USN-8913-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libx11 | 2:1.6.9-2ubuntu1.6+esm1 | USN-8913-1 |
| Ubuntu Pro 18.04 LTS | libx11 | 2:1.6.4-3ubuntu0.4+esm3 | USN-8913-1 |
| Ubuntu Pro 16.04 LTS | libx11 | 2:1.6.3-1ubuntu2.2+esm5 | USN-8913-1 |
| Ubuntu Pro 14.04 LTS | libx11 | 2:1.6.2-1ubuntu2.1+esm6 | USN-8913-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | libX11 +3 | 1.8.10-1.el10_2.1 | RHSA-2026:98564, RHSA-2026:91366 |
| RHEL 9 | libX11 +3 | 1.8.12-1.el9_8.1 | RHSA-2026:98461, RHSA-2026:91365 |
| RHEL 8 | libX11 +3 | 1.6.8-10.el8_10 | RHSA-2026:89730 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | libX11 +3 | 1.8.10-1.el10_0.1 | RHSA-2026:95499 |
| RHEL 9.6 EUS | libX11 +3 | 1.7.0-11.el9_6.1 | RHSA-2026:95498 |
| RHEL 9.4 E4S | libX11 +3 | 1.7.0-9.el9_4.1 | RHSA-2026:95497 |
| RHEL 9.2 E4S | libX11 +3 | 1.7.0-8.el9_2.1 | RHSA-2026:95496 |
| RHEL 8.8 TUS | libX11 +3 | 1.6.8-6.el8_8.1 | RHSA-2026:99565 |
| RHEL 8.8 E4S | libX11 +3 | 1.6.8-6.el8_8.1 | RHSA-2026:99565 |
| RHEL 8.6 EUS Long Life | libX11 +3 | 1.6.8-5.el8_6.1 | RHSA-2026:99566 |
| RHEL 8.6 AUS | libX11 +3 | 1.6.8-5.el8_6.1 | RHSA-2026:99566 |
| RHEL 7 ELS | libX11 +2 | 1.6.7-5.el7_9.1 | RHSA-2026:99754 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | libX11 +3 | 1.8.10-1.el10_2.1 | ALSA-2026:91366 |
| AlmaLinux 9 | libX11 +3 | 1.8.12-1.el9_8.1 | ALSA-2026:91365 |
| AlmaLinux 8 | libX11 +3 | 1.6.8-10.el8_10 | ALSA-2026:89730 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | libX11 | 1.8.10-1.el10_2.1 | RLSA-2026:98564, RLSA-2026:91366 |
| Rocky Linux 10 | libX11-xcb +2 | 1.8.13-1.el10_3.1 | RLSA-2026:98564 |
| Rocky Linux 9 | libX11 | 1.8.12-1.el9_8.1 | RLSA-2026:98461, RLSA-2026:91365 |
| Rocky Linux 8 | libX11 | 1.6.8-10.el8_10 | RLSA-2026:89730 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libX11 | 1.8.10-150700.4.8.1 | SUSE-SU-2026:4502-1 |
| SLES 15 SP6 | libX11 | 1.8.7-150600.3.11.1 | SUSE-SU-2026:4501-1 |
| SLES 15 SP5 | libX11 | 1.6.5-150000.3.41.1 | SUSE-SU-2026:4500-1 |
| SLES 15 SP4 | libX11 | 1.6.5-150000.3.41.1 | SUSE-SU-2026:4500-1 |
| SLES 12 SP5 | libX11 | 1.6.2-12.41.1 | SUSE-SU-2026:4410-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libX11 | 1.8.10-160000.4.1 | SUSE-SU-2026:23899-1 |
| SLES for SAP 15 SP6 | libX11 | 1.8.7-150600.3.11.1 | SUSE-SU-2026:4501-1 |
| SLES for SAP 15 SP5 | libX11 | 1.6.5-150000.3.41.1 | SUSE-SU-2026:4500-1 |
| SLES for SAP 15 SP4 | libX11 | 1.6.5-150000.3.41.1 | SUSE-SU-2026:4500-1 |
| SLES 16.0 | libX11 | 1.8.10-160000.4.1 | SUSE-SU-2026:23899-1 |
| SLE Micro 6.2 | libX11 | 1.8.10-160000.4.1 | SUSE-SU-2026:23885-1 |
| SLE Micro 6.1 | libX11 | 1.8.7-slfo.1.1_4.1 | SUSE-SU-2026:24552-1 |
| SLE Micro 6.0 | libX11 | 1.8.7-159998.1.1 | SUSE-SU-2026:24472-1, SUSE-SU-2026:24365-1 |
| SLE Micro 5.5 | libX11 | 1.6.5-150000.3.41.1 | SUSE-SU-2026:4500-1 |
| SLE Micro 5.4 | libX11 | 1.6.5-150000.3.41.1 | SUSE-SU-2026:4500-1 |
| SLE Micro 5.3 | libX11 | 1.6.5-150000.3.41.1 | SUSE-SU-2026:4500-1 |
| SLE HPC 15 SP5 | libX11 | 1.6.5-150000.3.41.1 | SUSE-SU-2026:4500-1 |
| SLE HPC 15 SP4 | libX11 | 1.6.5-150000.3.41.1 | SUSE-SU-2026:4500-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libX11 | 1.8.13-2.1 | openSUSE-SU-2026:11833-1 |
| openSUSE Leap 16.0 | libX11 | 1.8.10-160000.4.1 | openSUSE-SU-2026:21908-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libx11 | 1.8.14-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libX11 +3 | 1.8.10-2.amzn2023.0.2 | ALAS2023-2026-3179 |
| Amazon Linux 2 | libX11 +2 | 1.6.7-3.amzn2.0.6 | ALAS2-2026-3977 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libX11 | 1.8.14-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | libX11 +3 | 1.8.10-1.el10_2.1 | ELSA-2026-91366 |
| Oracle Linux 9 | libX11 +3 | 1.8.12-1.el9_8.1 | ELSA-2026-91365 |
| Oracle Linux 8 | libX11 +3 | 1.6.8-10.el8_10 | ELSA-2026-89730 |
Advisories 38
- RHSA-2026:99754 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99566 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99565 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:98564 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:98461 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:95497 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:95499 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:95496 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:95498 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:91365 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:91366 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:89730 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RLSA-2026:98564 Important: libX11 security update Rocky Linux Security Advisories · Nov 13, 2026
- WID-SEC-2026-3503 X.Org X11: Schwachstelle ermöglicht Codeausführung BSI CERT-Bund (WID) · Nov 12, 2026
- RLSA-2026:98461 Important: libX11 security update Rocky Linux Security Advisories · Nov 12, 2026
- SUSE-SU-2026:24552-1 Security update for libX11 SUSE / openSUSE Security Updates · Nov 7, 2026
- SUSE-SU-2026:24472-1 Security update for libX11 SUSE / openSUSE Security Updates · Nov 4, 2026
- RLSA-2026:91365 Important: libX11 security update Rocky Linux Security Advisories · Oct 30, 2026
- RLSA-2026:91366 Important: libX11 security update Rocky Linux Security Advisories · Oct 30, 2026
- ALSA-2026:91365 Important: libX11 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:91366 Important: libX11 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:89730 Important: libX11 security update AlmaLinux Security Advisories · Oct 29, 2026
- ELSA-2026-91365 Important: libX11 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 29, 2026
- SUSE-SU-2026:24365-1 Security update for libX11 SUSE / openSUSE Security Updates · Oct 27, 2026
- RLSA-2026:89730 Important: libX11 security update Rocky Linux Security Advisories · Oct 27, 2026
- ELSA-2026-91366 Important: libX11 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Oct 27, 2026
- ELSA-2026-89730 Important: libX11 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 26, 2026
- USN-8913-1 libx11 vulnerabilities Ubuntu Security Notices (USN) · Oct 12, 2026
- ALAS2-2026-3977 Important: libX11 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 12, 2026
- ALAS2023-2026-3179 Important: libX11 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 12, 2026
- SUSE-SU-2026:4500-1 Security update for libX11 SUSE / openSUSE Security Updates · Oct 6, 2026
- SUSE-SU-2026:4501-1 Security update for libX11 SUSE / openSUSE Security Updates · Oct 6, 2026
- SUSE-SU-2026:4502-1 Security update for libX11 SUSE / openSUSE Security Updates · Oct 6, 2026
- SUSE-SU-2026:4410-1 Security update for libX11 SUSE / openSUSE Security Updates · Oct 2, 2026
- SUSE-SU-2026:23899-1 Security update for libX11 SUSE / openSUSE Security Updates · Sep 30, 2026
- SUSE-SU-2026:23885-1 Security update for libX11 SUSE / openSUSE Security Updates · Sep 30, 2026
- openSUSE-SU-2026:21908-1 Security update for libX11 SUSE / openSUSE Security Updates · Sep 25, 2026
- openSUSE-SU-2026:11833-1 libX11-6-1.8.13-2.1 on GA media SUSE / openSUSE Security Updates · Sep 22, 2026