Description
An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as system availability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The X11 Project | libX11 | 1.6.12 | — |
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 | 2:1.6.12-1 | — |
| Debian 13 | libx11 | 2:1.6.12-1 | — |
| Debian 12 | libx11 | 2:1.6.12-1 | — |
| Debian 9 | libx11 | 2:1.6.4-3+deb9u3 | DLA-2361-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libx11 | 2:1.6.9-2ubuntu1.1 | USN-4487-1 |
| Ubuntu 18.04 LTS | libx11 | 2:1.6.4-3ubuntu0.3 | USN-4487-1 |
| Ubuntu 16.04 LTS | libx11 | 2:1.6.3-1ubuntu2.2 | USN-4487-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | libx11 | 2:1.6.2-1ubuntu2.1+esm1 | USN-4487-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | egl-wayland | 1.1.5-3.el8 | RHSA-2021:1804 |
| RHEL 8 | libX11 +3 | 1.6.8-4.el8 | RHSA-2021:1804 |
| RHEL 8 | libdrm +1 | 2.4.103-1.el8 | RHSA-2021:1804 |
| RHEL 8 | libglvnd +6 | 1:1.3.2-1.el8 | RHSA-2021:1804 |
| RHEL 8 | libinput +2 | 1.16.3-1.el8 | RHSA-2021:1804 |
| RHEL 8 | libwacom +2 | 1.6-2.el8 | RHSA-2021:1804 |
| RHEL 8 | mesa +15 | 20.3.3-2.el8 | RHSA-2021:1804 |
| RHEL 8 | xorg-x11-drivers | 7.7-30.el8 | RHSA-2021:1804 |
| RHEL 8 | xorg-x11-server +9 | 1.20.10-1.el8 | RHSA-2021:1804 |
| RHEL 7 | libX11 +2 | 1.6.7-3.el7_9 | RHSA-2020:4908 |
| RHEL 6 | libX11 +2 | 1.6.4-4.el6_10 | RHSA-2020:4946 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | libglvnd +6 | 1:1.3.2-1.el8 | ALSA-2021:1804 |
| AlmaLinux 8 | libinput-devel | 1.16.3-1.el8 | ALSA-2021:1804 |
| AlmaLinux 8 | libwacom-devel | 1.6-2.el8 | ALSA-2021:1804 |
| AlmaLinux 8 | mesa-libgbm-devel +1 | 20.3.3-2.el8 | ALSA-2021:1804 |
| AlmaLinux 8 | xorg-x11-drivers | 7.7-30.el8 | ALSA-2021:1804 |
| AlmaLinux 8 | xorg-x11-server-devel +1 | 1.20.10-1.el8 | ALSA-2021:1804 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | egl-wayland | 1.1.5-3.el8 | RLSA-2021:1804 |
| Rocky Linux 8 | libX11 | 1.6.8-4.el8 | RLSA-2021:1804 |
| Rocky Linux 8 | libdrm | 2.4.103-1.el8 | RLSA-2021:1804 |
| Rocky Linux 8 | libglvnd | 1:1.3.2-1.el8 | RLSA-2021:1804 |
| Rocky Linux 8 | libinput | 1.16.3-1.el8 | RLSA-2021:1804 |
| Rocky Linux 8 | libwacom | 1.6-2.el8 | RLSA-2021:1804 |
| Rocky Linux 8 | mesa | 20.3.3-2.el8 | RLSA-2021:1804 |
| Rocky Linux 8 | xorg-x11-drivers | 7.7-30.el8 | RLSA-2021:1804 |
| Rocky Linux 8 | xorg-x11-server | 1.20.10-1.el8 | RLSA-2021:1804 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | libX11 | 1.6.5-3.12.1 | SUSE-SU-2020:2474-1 |
| SLES 15 SP1 | libX11 | 1.6.5-3.12.1 | SUSE-SU-2020:2474-1 |
| SLES 15 | libX11 | 1.6.5-3.12.1 | SUSE-SU-2020:2474-2 |
| SLES 12 SP5 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-1 |
| SLES 12 SP4 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
| SLES 12 SP2 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
| SLES for SAP 15 | libX11 | 1.6.5-3.12.1 | SUSE-SU-2020:2474-2 |
| SLES for SAP 12 SP5 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-1 |
| SLES for SAP 12 SP4 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
| SLES for SAP 12 SP3 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
| SLES for SAP 12 SP2 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
| SLE HPC 15 | libX11 | 1.6.5-3.12.1 | SUSE-SU-2020:2474-2 |
| SUSE OpenStack Cloud Crowbar 9 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
| SUSE OpenStack Cloud Crowbar 8 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
| SUSE OpenStack Cloud 9 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
| SUSE OpenStack Cloud 8 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
| SUSE OpenStack Cloud 7 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
| SUSE HPE Helion OpenStack 8 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
| SUSE Enterprise Storage 5 | libX11 | 1.6.2-12.15.1 | SUSE-SU-2020:2475-2 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libX11 | 1.7.2-1.2 | openSUSE-SU-2024:10918-1 |
| openSUSE Leap 15.2 | libX11 | 1.6.5-lp152.5.9.1 | openSUSE-SU-2020:1370-1 |
| openSUSE Leap 15.1 | libX11 | 1.6.5-lp151.4.9.1 | openSUSE-SU-2020:1368-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libx11 | 1.6.12-r0 | — |
| Alpine v3.23 | libx11 | 1.6.12-r0 | — |
| Alpine v3.22 | libx11 | 1.6.12-r0 | — |
| Alpine v3.21 | libx11 | 1.6.12-r0 | — |
| Alpine v3.20 | libx11 | 1.6.12-r0 | — |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libx11 | 1.6.12-r0 | — |
| Alpine v3.18 | libx11 | 1.6.12-r0 | — |
| Alpine v3.17 | libx11 | 1.6.12-r0 | — |
| Alpine v3.16 | libx11 | 1.6.12-r0 | — |
| Alpine v3.15 | libx11 | 1.6.12-r0 | — |
| Alpine v3.14 | libx11 | 1.6.12-r0 | — |
| Alpine v3.13 | libx11 | 1.6.12-r0 | — |
| Alpine v3.12 | libx11 | 1.6.12-r0 | — |
| Alpine v3.11 | libx11 | 1.6.12-r0 | — |
| Alpine v3.10 | libx11 | 1.6.12-r0 | — |
| Alpine v3.9 | libx11 | 1.6.12-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | libX11 +2 | 1.6.7-3.amzn2 | ALAS2-2020-1567 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | egl-wayland | 1.1.5-3.el8 | ELSA-2021-1804 |
| Oracle Linux 8 | libX11 +3 | 1.6.8-4.el8 | ELSA-2021-1804 |
| Oracle Linux 8 | libdrm +1 | 2.4.103-1.el8 | ELSA-2021-1804 |
| Oracle Linux 8 | libglvnd +6 | 1:1.3.2-1.el8 | ELSA-2021-1804 |
| Oracle Linux 8 | libinput +2 | 1.16.3-1.el8 | ELSA-2021-1804 |
| Oracle Linux 8 | libwacom +2 | 1.6-2.el8 | ELSA-2021-1804 |
| Oracle Linux 8 | mesa-libGL +14 | 20.3.3-2.el8 | ELSA-2021-1804 |
| Oracle Linux 8 | xorg-x11-drivers | 7.7-30.el8 | ELSA-2021-1804 |
| Oracle Linux 8 | xorg-x11-server-Xdmx +8 | 1.20.10-1.el8 | ELSA-2021-1804 |
| Oracle Linux 7 | libX11 +2 | 1.6.7-3.el7_9 | ELSA-2020-4908 |
Advisories 18
- ALSA-2021:1804 Moderate: userspace graphics, xorg-x11, and mesa security, bug fix, and enhancement update AlmaLinux Security Advisories · Nov 5, 2026
- RHSA-2021:1804 Red Hat Security Advisory: userspace graphics, xorg-x11, and mesa security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2020:4908 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2020:4946 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4487-2 libx11 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4487-1 libx11 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-2361-1 libx11 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:1804 Moderate: userspace graphics, xorg-x11, and mesa security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:10918-1 libX11-6-1.7.2-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2474-2 Security update for libX11 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1370-1 Security update for libX11 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2475-2 Security update for libX11 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2475-1 Security update for libX11 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2474-1 Security update for libX11 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1368-1 Security update for libX11 SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2021-1804 Moderate: userspace graphics, xorg-x11, and mesa security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 25, 2021
- ALAS2-2020-1567 Important: libX11 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 8, 2020
- ELSA-2020-4908 Important: libX11 security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 6, 2020
References
- https://github.com/Ruia-ruia/Exploits/blob/master/DFX11details.txt
- https://github.com/Ruia-ruia/Exploits/blob/master/x11doublefree.sh
- https://lists.x.org/archives/xorg-announce/2020-August/003056.html
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14363
- USN-4487-2 vendor-advisory
- FEDORA-2020-cf0afbd27e vendor-advisory