USN-1522-1: QEMU vulnerability

2 August 2012

qemu-kvm vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.04 LTS


QEMU could be made to overwrite files as the administrator, or expose sensitive information.

Software Description

  • qemu-kvm - Machine emulator and virtualizer


It was discovered that QEMU incorrectly handled temporary files when creating a snapshot. A local attacker could use this flaw to possibly overwrite files with root privilege, or obtain sensitive information from the guest.

Update instructions

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

Ubuntu 12.04 LTS
qemu-kvm - 1.0+noroms-0ubuntu14.1
Ubuntu 11.10
qemu-kvm - 0.14.1+noroms-0ubuntu6.4
Ubuntu 11.04
qemu-kvm - 0.14.0+noroms-0ubuntu4.6
Ubuntu 10.04 LTS
qemu-kvm - 0.12.3+noroms-0ubuntu9.19

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.