X.Org: Heap overflow in pixmap allocation

Background

X.Org is X.Org Foundation’s Public Implementation of the X Window System.

Description

X.Org is missing an integer overflow check during pixmap memory allocation.

Impact

An X.Org user could exploit this issue to make the X server execute arbitrary code with elevated privileges.

Workaround

There is no known workaround at this time.

Resolution

All X.org users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=x11-base/xorg-x11-6.8.2-r3"