CVE-2013-1981: Canonical Ubuntu Linux

Medium severity, CVSS 6.8. EPSS: 1.4% chance of exploitation in the next 30 days.

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.

Affected products

• Canonical Ubuntu Linux: version 10.04 only; version 12.04 only; version 12.10 only; version 13.04 only
• X LIBX11: up to and including 1.5.99.901; version 1.5.0 only

Published 2013-06-15. Last modified 2026-06-16.