Secunia Security Advisory – Red Hat has issued an update for xen. This fixes a weakness, which can be exploited by malicious people to bypass certain security restrictions.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/81796/sa36908.txt
Source: https://packetstormsecurity.com/files/81796/Secunia-Security-Advisory-36908.html