Ubuntu Security Notice 863-1 - It was discovered that QEMU did not properly setup the virtio networking features available to its guests. A remote attacker could exploit this to crash QEMU guests which use virtio networking on Linux kernels earlier than 2.6.26.
d718ab3b40e66576dfc8b22a4d3385387c8f8dcc007a154a5dddd7e6974ca042