Ubuntu has released security updates to address multiple vulnerabilities affecting Ubuntu 15.04, 14.10, 14.04 LTS, and 12.04 LTS. These updates address vulnerabilities that could allow an attacker to take control of the affected system.
Users and administrators are encouraged to review Ubuntu Security Notices released and apply the necessary updates.
For more information please visit: USN-2629-1, USN-2630-1, USN-2631-1, USN-2632-1, USN-2633-1,USN-2634-1,USN-2635-1,USN-2636-1 ,USN-2637-1 and USN-2638-1