Description
Integer underflow in the xTrapezoidValid macro in render/picture.h in X.Org allows context-dependent attackers to cause a denial of service (crash) via a negative bottom value.
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 | 2:1.14.2.901-1 | — |
| Debian 13 | xorg-server | 2:1.14.2.901-1 | — |
| Debian 12 | xorg-server | 2:1.14.2.901-1 | — |
| Debian 7 | xorg-server | 2:1.12.4-6+deb7u2 | DSA-2822-1 |
| Debian 6.0 | xorg-server | 2:1.7.7-18 | DSA-2822-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | xorg-server | 2:1.15.1-0ubuntu2.7 | USN-2500-1 |
| Ubuntu 14.04 LTS | xorg-server-lts-utopic | 2:1.16.0-1ubuntu1.2~trusty2 | USN-2500-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | xorg-x11-server +8 | 1.13.0-23.1.el6_5 | RHSA-2013:1868 |
| RHEL 5 | xorg-x11-server +7 | 1.1.1-48.101.el5_10.2 | RHSA-2013:1868 |
Advisories 3
- RHSA-2013:1868 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-2500-1 xorg-server, xorg-server-lts-trusty, xorg-server-lts-utopic vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-2822-1 xorg-server - integer underflow Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1197921
- [xorg-devel] 20131002 [PATCH] exa: only draw valid trapezoids mailing-list
- https://bugs.freedesktop.org/show_bug.cgi?id=67484
- [oss-security] 20131204 Re: CVE Request: xorg-server and pixman mailing-list
- GLSA-201701-64 vendor-advisory
- DSA-2822 vendor-advisory
- USN-2500-1 vendor-advisory
- GLSA-201710-30 vendor-advisory
- RHSA-2013:1868 vendor-advisory
- [oss-security] 20131203 CVE Request: xorg-server and pixman mailing-list
- openSUSE-SU-2013:1965 vendor-advisory