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USN-1339-1: QEMU vulnerability

23 January 2012

A remote attacker could cause QEMU to crash.



  • qemu-kvm - Machine emulator and virtualizer


Nicolae Mogoreanu discovered that QEMU did not properly verify legacy mode
packets in the e1000 network driver. A remote attacker could exploit this
to cause a denial of service or possibly execute code with the privileges
of the user invoking the program.

When using QEMU with libvirt or virtualization management software based on
libvirt such as Eucalyptus and OpenStack, QEMU guests are individually
isolated by an AppArmor profile by default in Ubuntu.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 11.10
Ubuntu 11.04
Ubuntu 10.10
Ubuntu 10.04

After a standard system update you need to restart running virtual machines
which use the e1000 network driver to make all the necessary changes.