Ubuntu Security Notice USN-804-1 – Tavis Ormandy and Yorick Koster discovered that PulseAudio did not safely re-execute itself. A local attacker could exploit this to gain root privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/79332/USN-804-1.txt
Source: https://packetstormsecurity.com/files/79332/Ubuntu-Security-Notice-804-1.html