==========================================================Ubuntu Security Notice USN-280-1 May 04, 2006
A security issue affects the following Ubuntu releases:
The problem can be corrected by upgrading the affected package to
version 6.8.2-10.2 (for Ubuntu 5.04) or 6.8.2-77.1 (for Ubuntu 5.10).
After a standard system upgrade you need to restart X.org by
restarting your session to effect the necessary changes.
The Render extension of the X.org server incorrectly calculated the
size of a memory buffer, which led to a buffer overflow. A local
attacker could exploit this to crash the X server or even execute
arbitrary code with root privileges.