Mandriva Linux Security Advisory 2009-257 – Qemu 0.9.1 and earlier does not perform range checks for block device read or write requests, which allows guest host users with root privileges to access arbitrary memory and escape the virtual machine. The updated packages have been patched to prevent this.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/81846/MDVSA-2009-257.txt
Source: https://packetstormsecurity.com/files/81846/Mandriva-Linux-Security-Advisory-2009-257.html