A security issue affects the following Ubuntu releases:
Ubuntu 9.10
This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.
The problem can be corrected by upgrading your system to the following package versions:
Ubuntu 9.10: qemu-kvm 0.11.0-0ubuntu6.3
After a standard system upgrade you need to restart any QEMU guests to effect the necessary changes.
Details follow:
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.