Integer overflow in the virtio_net_handle_mac function in hw/net/virtio-net.c in QEMU 2.0 and earlier allows local guest users to execute arbitrary code via a MAC addresses table update request, which triggers a heap-based buffer overflow.
article.gmane.org/gmane.comp.emulators.qemu/266768
secunia.com/advisories/57878
secunia.com/advisories/58191
thread.gmane.org/gmane.comp.emulators.qemu/266713
www.debian.org/security/2014/dsa-2909
www.debian.org/security/2014/dsa-2910
www.ubuntu.com/usn/USN-2182-1
bugzilla.redhat.com/show_bug.cgi?id=1078846