Ubuntu Security Notice USN-187-1 – A Denial of Service vulnerability was detected in the stack segment fault handler. A local attacker could exploit this by causing stack fault exceptions under special circumstances (scheduling), which lead to a kernel crash. Vasiliy Averin discovered a Denial of Service vulnerability in the tiocgdev ioctl call and in the routing_ioctl function. By calling fget() and fput() in special ways, a local attacker could exploit this to destroy file descriptor structures and crash the kernel.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/40256/USN-187-1.txt
Source: https://packetstormsecurity.com/files/40256/Ubuntu-Security-Notice-187-1.html