Ubuntu Security Notice USN-694-1 – It was discovered that libvirt did not mark certain operations as read-only. A local attacker may be able to perform privileged actions such as migrating virtual machines, adjusting autostart flags, or accessing privileged data in the virtual machine memory and disks.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/73174/USN-694-1.txt
Source: https://packetstormsecurity.com/files/73174/Ubuntu-Security-Notice-694-1.html