Description
Use-after-free vulnerability in the doImageText function in dix/dixfonts.c in the xorg-server module before 1.14.4 in X.Org X11 allows remote authenticated users to cause a denial of service (daemon crash) or possibly execute arbitrary code via a crafted ImageText request that triggers memory-allocation failure.
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 | 2:1.14.3-4 | — |
| Debian 13 | xorg-server | 2:1.14.3-4 | — |
| Debian 12 | xorg-server | 2:1.14.3-4 | — |
| Debian 7 | xorg-server | 2:1.12.4-6+deb7u1 | DSA-2784-1 |
| Debian 6.0 | xorg-server | 2:1.7.7-17 | DSA-2784-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | xorg-x11-server +8 | 1.13.0-11.1.el6_4.2 | RHSA-2013:1426 |
| RHEL 5 | xorg-x11-server +7 | 1.1.1-48.101.el5_10.1 | RHSA-2013:1426 |
Advisories 2
- RHSA-2013:1426 Red Hat Security Advisory: xorg-x11-server security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-2784-1 xorg-server - use-after-free Debian Security (DSA / DLA) · Mar 9, 2026
References
- openSUSE-SU-2013:1610 vendor-advisory
- RHSA-2013:1426 vendor-advisory
- openSUSE-SU-2013:1614 vendor-advisory
- DSA-2784 vendor-advisory
- USN-1990-1 vendor-advisory
- 62892 vdb-entry
- [oss-security] 20131008 Fwd: X.Org security advisory: CVE-2013-4396: Use after free in Xserver handling of ImageText requests mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=1014561
- [xorg-announce] 20131008 X.Org security advisory: CVE-2013-4396: Use after free in Xserver handling of ImageText requests mailing-list