Secunia Security Advisory - OpenVZ has issued an update for the kernel. This fixes two vulnerabilities, which can be exploited by malicious, local users in a guest virtual machine to gain escalated privileges and by malicious people to cause a DoS (Denial of Service).
c3bd672bab9218c466b2db8bc5c1450fd11b5613ee9c6fdf101f4d60a2c6c8e5