Ubuntu Security Notice USN-260-1 – Chris Moore discovered a buffer overflow in a particular class of lexicographical scanners generated by flex. This could be exploited to execute arbitrary code by processing specially crafted user-defined input to an application that uses a flex scanner for parsing.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/44428/USN-260-1.txt
Source: https://packetstormsecurity.com/files/44428/Ubuntu-Security-Notice-260-1.html