Description
Multiple integer overflows in X.org libX11 1.5.99.901 (1.6 RC1) and earlier allow X servers to trigger allocation of insufficient memory and a buffer overflow via vectors related to the (1) XQueryFont, (2) _XF86BigfontQueryFont, (3) XListFontsWithInfo, (4) XGetMotionEvents, (5) XListHosts, (6) XGetModifierMapping, (7) XGetPointerMapping, (8) XGetKeyboardMapping, (9) XGetWindowProperty, (10) XGetImage, (11) LoadColornameDB, (12) XrmGetFileDatabase, (13) _XimParseStringFile, or (14) TransFileName functions.
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 | libx11 | 2:1.5.0-1+deb7u1 | — |
| Debian 13 | libx11 | 2:1.5.0-1+deb7u1 | — |
| Debian 12 | libx11 | 2:1.5.0-1+deb7u1 | — |
| Debian 7 | libx11 | 2:1.5.0-1+deb7u1 | DSA-2693-1 |
| Debian 6.0 | libx11 | 2:1.3.3-4+squeeze1 | DSA-2693-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | libX11 +2 | 1.6.0-2.2.el6 | RHSA-2014:1436 |
| RHEL 6 | libXcursor +1 | 1.1.14-2.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libXext +1 | 1.3.2-2.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libXfixes +1 | 5.0.1-2.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libXi +1 | 1.7.2-2.2.el6 | RHSA-2014:1436 |
| RHEL 6 | libXp +1 | 1.0.2-2.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libXrandr +1 | 1.4.1-2.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libXrender +1 | 0.9.8-2.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libXres +1 | 1.0.7-2.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libXt +1 | 1.1.4-6.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libXtst +1 | 1.2.2-2.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libXv +1 | 1.0.9-2.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libXvMC +1 | 1.0.8-2.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libXxf86dga +1 | 1.1.4-2.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libXxf86vm +3 | 1.1.3-2.1.el6 | RHSA-2014:1436 |
| RHEL 6 | libdmx +1 | 1.1.3-3.el6 | RHSA-2014:1436 |
| RHEL 6 | libxcb +3 | 1.9.1-2.el6 | RHSA-2014:1436 |
| RHEL 6 | xcb-proto | 1.8-3.el6 | RHSA-2014:1436 |
| RHEL 6 | xkeyboard-config +1 | 2.11-1.el6 | RHSA-2014:1436 |
| RHEL 6 | xorg-x11-proto-devel | 7.7-9.el6 | RHSA-2014:1436 |
| RHEL 6 | xorg-x11-xtrans-devel | 1.3.4-1.el6 | RHSA-2014:1436 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libX11 | 1.6.4-2.1 | openSUSE-SU-2024:10395-1 |
Advisories 3
- RHSA-2014:1436 Red Hat Security Advisory: X11 client libraries security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DSA-2693-1 libx11 - several Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10395-1 libX11-6-1.6.4-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 60120 vdb-entry
- FEDORA-2013-9079 vendor-advisory
- USN-1854-1 vendor-advisory
- [oss-security] 20130523 Fwd: [ANNOUNCE] X.Org Security Advisory: Protocol handling issues in X Window System client libraries mailing-list
- http://www.x.org/wiki/Development/Security/Advisory-2013-05-23
- DSA-2693 vendor-advisory