Description
In X.Org Server (aka xserver and xorg-server) before 1.19.4, a local attacker authenticated to the X server could overflow a global buffer, causing crashes of the X server or potentially other problems by injecting large or malformed XKB related atoms and accessing them via xkbcomp.
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 | 2:1.19.4-1 | — |
| Debian 13 | xorg-server | 2:1.19.4-1 | — |
| Debian 12 | xorg-server | 2:1.19.4-1 | — |
| Debian 9 | xorg-server | 2:1.19.2-1+deb9u2 | DSA-4000-1 |
| Debian 8 | xorg-server | 2:1.16.4-1+deb8u2 | DSA-4000-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | xorg-server | 2:1.12.4-6+deb7u8 | DLA-1186-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | xorg-server | 2:1.18.4-0ubuntu0.6 | USN-3453-1 |
| Ubuntu 16.04 LTS | xorg-server-hwe-16.04 | 2:1.19.3-1ubuntu1~16.04.3 | USN-3453-1 |
| Ubuntu 14.04 LTS | xorg-server | 2:1.15.1-0ubuntu2.10 | USN-3453-1 |
| Ubuntu 14.04 LTS | xorg-server-lts-xenial | 2:1.18.3-1ubuntu2.3~trusty3 | USN-3453-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | xorg-x11-server | 7.6_1.18.3-76.15.2 | SUSE-SU-2017:3047-1 |
| SLES 12 SP2 | xorg-x11-server | 7.6_1.18.3-76.15.2 | SUSE-SU-2017:3047-1 |
| SLES 11 SP4 | xorg-x11-server | 7.4-27.122.16.1 | SUSE-SU-2017:3025-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | xorg-x11-server | 7.6_1.18.3-76.15.2 | SUSE-SU-2017:3047-1 |
| SLES for SAP 12 SP2 | xorg-x11-server | 7.6_1.18.3-76.15.2 | SUSE-SU-2017:3047-1 |
| SLES for SAP 11 SP4 | xorg-x11-server | 7.4-27.122.16.1 | SUSE-SU-2017:3025-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.23 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.22 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.21 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.20 | xorg-server | 1.19.5-r0 | — |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.18 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.17 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.16 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.15 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.14 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.13 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.12 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.11 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.10 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.9 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.8 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.7 | xorg-server | 1.19.5-r0 | — |
| Alpine v3.6 | xorg-server | 1.19.5-r0 | — |
Advisories 5
- USN-3453-1 xorg-server, xorg-server-hwe-16.04, xorg-server-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4000-1 xorg-server - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1186-1 xorg-server - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:3025-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:3047-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 101253 vdb-entry
- https://cgit.freedesktop.org/xorg/xserver/commit/?id=94f11ca5cf011ef123bd222cabeaef6f424d76ac
- [debian-lts-announce] 20171122 [SECURITY] [DLA 1186-1] xorg-server security update mailing-list
- GLSA-201710-30 vendor-advisory
- [oss-security] 20171004 Fwd: X server fixes for CVE-2017-13721 & CVE-2017-13723 mailing-list
- DSA-4000 vendor-advisory
- [xorg-announce] 20171004 [ANNOUNCE] xorg-server 1.19.4 mailing-list