Guests using the QXL graphics driver could be caused to hang or crash.
It was discovered that the QXL graphics driver incorrectly handled terminated connections. An attacker that could connect to a guest using SPICE and the QXL graphics driver could cause the guest to hang or crash, resulting in a denial of service.
5 February 2013
A security issue affects these releases of Ubuntu and its derivatives:
Guests using the QXL graphics driver could be caused to hang or crash.
It was discovered that the QXL graphics driver incorrectly handled terminated connections. An attacker that could connect to a guest using SPICE and the QXL graphics driver could cause the guest to hang or crash, resulting in a denial of service.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make all the necessary changes.
Vulmon