Description
In X.Org Server (aka xserver and xorg-server) before 1.19.4, an attacker authenticated to an X server with the X shared memory extension enabled can cause aborts of the X server or replace shared memory segments of other X clients in the same session.
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 |
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 |
Show 2 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 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xorg-x11-server | 1.20.13-1.2 | openSUSE-SU-2024:11525-1 |
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 4
- 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
- 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-2017:3047-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://cgit.freedesktop.org/xorg/xserver/commit/?id=b95f25af141d33a65f6f821ea9c003f66a01e1f1
- GLSA-201710-30 vendor-advisory
- [oss-security] 20171004 Fwd: X server fixes for CVE-2017-13721 & CVE-2017-13723 mailing-list
- 101238 vdb-entry
- DSA-4000 vendor-advisory
- [xorg-announce] 20171004 [ANNOUNCE] xorg-server 1.19.4 mailing-list