Several security issues were fixed in QEMU.
Michael S. Tsirkin discovered that QEMU incorrectly handled vmxnet3 devices. A local guest could possibly use this issue to cause a denial of service, or possibly execute arbitrary code on the host. This issue only applied to Ubuntu 13.10 and Ubuntu 14.04 LTS. (CVE-2013-4544)
28 April 2014
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in QEMU.
Michael S. Tsirkin discovered that QEMU incorrectly handled vmxnet3 devices. A local guest could possibly use this issue to cause a denial of service, or possibly execute arbitrary code on the host. This issue only applied to Ubuntu 13.10 and Ubuntu 14.04 LTS. (CVE-2013-4544)
Michael S. Tsirkin discovered that QEMU incorrectly handled virtio-net MAC addresses. A local guest could possibly use this issue to cause a denial of service, or possibly execute arbitrary code on the host. (CVE-2014-0150)
Benoît Canet discovered that QEMU incorrectly handled SMART self-tests. A local guest could possibly use this issue to cause a denial of service, or possibly execute arbitrary code on the host. (CVE-2014-2894)
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.