Ubuntu Security Notice USN-341-1 – An integer overflow has been discovered in X.org’s font handling library. By using a specially crafted font file, this could be exploited to crash the X server or execute arbitrary code with root privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/49806/USN-341-1.txt
Source: https://packetstormsecurity.com/files/49806/Ubuntu-Security-Notice-341-1.html