Ubuntu Security Notice 863-1 – It was discovered that QEMU did not properly setup the virtio networking features available to its guests. A remote attacker could exploit this to crash QEMU guests which use virtio networking on Linux kernels earlier than 2.6.26.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/83417/USN-863-1.txt
Source: https://packetstormsecurity.com/files/83417/Ubuntu-Security-Notice-863-1.html