xen - several

Multiple vulnerabilities have been discovered in the Xen hypervisor.
The Common Vulnerabilities and Exposures project identifies the following
problems:

• CVE-2012-4544
  Insufficient validation of kernel or ramdisk sizes in the Xen PV
  domain builder could result in denial of service.
• CVE-2012-5511
  Several HVM control operations performed insufficient validation of
  input, which could result in denial of service through resource
  exhaustion.
• CVE-2012-5634
  Incorrect interrupt handling when using VT-d hardware could result
  in denial of service.
• CVE-2013-0153
  Insufficient restriction of interrupt access could result in denial
  of service.

For the stable distribution (squeeze), these problems have been fixed in
version 4.0.1-5.8.

For the testing distribution (wheezy), these problems have been fixed in
version 4.1.4-2.

For the unstable distribution (sid), these problems have been fixed in
version 4.1.4-2.

We recommend that you upgrade your xen packages.