A privileged attacker within a QEMU guest could cause QEMU to crash.
Nelson Elhage discoverd that QEMU did not properly validate certain virtqueue requests from the guest. An attacker could exploit this to cause a denial of service of the guest or possibly execute code with the privileges of the user invoking the program. (CVE-2011-2212)
6 July 2011
A security issue affects these releases of Ubuntu and its derivatives:
A privileged attacker within a QEMU guest could cause QEMU to crash.
Nelson Elhage discoverd that QEMU did not properly validate certain virtqueue requests from the guest. An attacker could exploit this to cause a denial of service of the guest or possibly execute code with the privileges of the user invoking the program. (CVE-2011-2212)
Stefan Hajnoczi discovered that QEMU did not properly perform integer comparisons when performing virtqueue input validation. An attacker could exploit this to cause a denial of service of the guest or possibly execute code with the privileges of the user invoking the program. (CVE-2011-2512)
When using QEMU with libvirt or virtualization management software based on libvirt such as Eucalyptus and OpenStack, QEMU guests are individually isolated by an AppArmor profile by default in Ubuntu.
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 restart running virtual machines to make all the necessary changes.