Ubuntu Security Notice 641-1 – It was discovered that there were multiple ways to leak memory during the IKE negotiation when handling certain packets. If a remote attacker sent repeated malicious requests, the “racoon” key exchange server could allocate large amounts of memory, possibly leading to a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/69765/USN-641-1.txt
Source: https://packetstormsecurity.com/files/69765/Ubuntu-Security-Notice-641-1.html