Use-after-free vulnerability in the virtio-pci implementation in Qemu 1.4.0 through 1.6.0 allows local users to cause a denial of service (daemon crash) by "hot-unplugging" a virtio device.
https://bugzilla.redhat.com/show_bug.cgi?id=1012633
http://www.ubuntu.com/usn/USN-2092-1
http://www.openwall.com/lists/oss-security/2013/09/26/5
http://secunia.com/advisories/55015
http://lists.nongnu.org/archive/html/qemu-devel/2013-09/msg03347.html