Description
A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | xorg-x11-server | before xorg-x11-server 1.20.9 | — |
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 | 2:1.20.9-1 | — |
| Debian 13 | xorg-server | 2:1.20.9-1 | — |
| Debian 12 | xorg-server | 2:1.20.9-1 | — |
| Debian 10 | xorg-server | 2:1.20.4-1+deb10u1 | DSA-4758-1 |
| Debian 9 | xorg-server | 2:1.19.2-1+deb9u6 | DLA-2359-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | xorg-server | 2:1.20.8-2ubuntu2.3 | USN-4488-1 |
| Ubuntu 18.04 LTS | xorg-server | 2:1.19.6-1ubuntu4.5 | USN-4488-1 |
| Ubuntu 18.04 LTS | xorg-server-hwe-18.04 | 2:1.20.8-2ubuntu2.2~18.04.2 | USN-4488-1 |
| Ubuntu 16.04 LTS | xorg-server | 2:1.18.4-0ubuntu0.9 | USN-4488-1 |
| Ubuntu 16.04 LTS | xorg-server-hwe-16.04 | 2:1.19.6-1ubuntu4.1~16.04.3 | USN-4488-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | xorg-server | 2:1.15.1-0ubuntu2.11+esm2 | USN-4488-2 |
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 | xorg-x11-server +9 | 1.20.4-12.el7_9 | RHSA-2020:4910 |
| RHEL 6 | xorg-x11-server +8 | 1.17.4-18.el6_10 | RHSA-2020:4953 |
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 | xorg-x11-server | 1.20.3-22.5.1 | SUSE-SU-2020:2240-1 |
| SLES 15 SP1 | xorg-x11-server | 1.20.3-14.5.1 | SUSE-SU-2020:2241-1 |
| SLES 15 | xorg-x11-server | 1.19.6-8.16.1 | SUSE-SU-2020:2326-1 |
| SLES 12 SP5 | xorg-x11-server | 1.19.6-10.8.1 | SUSE-SU-2020:2242-1 |
| SLES 12 SP4 | xorg-x11-server | 1.19.6-4.8.1 | SUSE-SU-2020:2325-1 |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | xorg-x11-server | 7.6_1.18.3-76.26.1 | SUSE-SU-2020:2331-1 |
| SLES 12 SP2 | xorg-x11-server | 7.6_1.18.3-76.26.1 | SUSE-SU-2020:2331-1 |
| SLES for SAP 15 | xorg-x11-server | 1.19.6-8.16.1 | SUSE-SU-2020:2326-1 |
| SLES for SAP 12 SP5 | xorg-x11-server | 1.19.6-10.8.1 | SUSE-SU-2020:2242-1 |
| SLES for SAP 12 SP4 | xorg-x11-server | 1.19.6-4.8.1 | SUSE-SU-2020:2325-1 |
| SLES for SAP 12 SP3 | xorg-x11-server | 7.6_1.18.3-76.26.1 | SUSE-SU-2020:2331-1 |
| SLES for SAP 12 SP2 | xorg-x11-server | 7.6_1.18.3-76.26.1 | SUSE-SU-2020:2331-1 |
| SLE HPC 15 | xorg-x11-server | 1.19.6-8.16.1 | SUSE-SU-2020:2326-1 |
| SUSE OpenStack Cloud Crowbar 9 | xorg-x11-server | 1.19.6-4.8.1 | SUSE-SU-2020:2325-1 |
| SUSE OpenStack Cloud Crowbar 8 | xorg-x11-server | 7.6_1.18.3-76.26.1 | SUSE-SU-2020:2331-1 |
| SUSE OpenStack Cloud 9 | xorg-x11-server | 1.19.6-4.8.1 | SUSE-SU-2020:2325-1 |
| SUSE OpenStack Cloud 8 | xorg-x11-server | 7.6_1.18.3-76.26.1 | SUSE-SU-2020:2331-1 |
| SUSE OpenStack Cloud 7 | xorg-x11-server | 7.6_1.18.3-76.26.1 | SUSE-SU-2020:2331-1 |
| SUSE HPE Helion OpenStack 8 | xorg-x11-server | 7.6_1.18.3-76.26.1 | SUSE-SU-2020:2331-1 |
| SUSE Enterprise Storage 5 | xorg-x11-server | 7.6_1.18.3-76.26.1 | SUSE-SU-2020:2331-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xorg-x11-server | 1.20.13-1.2 | openSUSE-SU-2024:11525-1 |
| openSUSE Leap 15.2 | xorg-x11-server | 1.20.3-lp152.8.3.1 | openSUSE-SU-2020:1302-1 |
| openSUSE Leap 15.1 | xorg-x11-server | 1.20.3-lp151.4.3.1 | openSUSE-SU-2020:1279-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xorg-server | 1.20.9-r0 | — |
| Alpine v3.23 | xorg-server | 1.20.9-r0 | — |
| Alpine v3.22 | xorg-server | 1.20.9-r0 | — |
| Alpine v3.21 | xorg-server | 1.20.9-r0 | — |
| Alpine v3.20 | xorg-server | 1.20.9-r0 | — |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xorg-server | 1.20.9-r0 | — |
| Alpine v3.18 | xorg-server | 1.20.9-r0 | — |
| Alpine v3.17 | xorg-server | 1.20.9-r0 | — |
| Alpine v3.16 | xorg-server | 1.20.9-r0 | — |
| Alpine v3.15 | xorg-server | 1.20.9-r0 | — |
| Alpine v3.14 | xorg-server | 1.20.9-r0 | — |
| Alpine v3.13 | xorg-server | 1.20.9-r0 | — |
| Alpine v3.12 | xorg-server | 1.20.9-r0 | — |
| Alpine v3.11 | xorg-server | 1.20.6-r2 | — |
| Alpine v3.10 | xorg-server | 1.20.5-r2 | — |
| Alpine v3.9 | xorg-server | 1.20.3-r2 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | xorg-x11-server-Xdmx +8 | 1.20.4-12.amzn2.0.1 | ALAS2-2020-1571 |
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 | xorg-x11-server-Xdmx +8 | 1.20.4-12.el7_9 | ELSA-2020-4910 |
Advisories 21
- 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-2020:4910 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2020:4953 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-4488-2 xorg-server vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4488-1 xorg-server, xorg-server-hwe-16.04, xorg-server-hwe-18.04 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4758-1 xorg-server - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2359-1 xorg-server - 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
- SUSE-SU-2020:2331-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1302-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11525-1 xorg-x11-server-1.20.13-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2240-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2242-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2241-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2325-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2326-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1279-1 Security update for xorg-x11-server 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
- ALAS2-2020-1571 Important: xorg-x11-server security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 8, 2020
- ELSA-2020-4910 Important: xorg-x11-server security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 6, 2020