Ubuntu: Security Notice USN-2636-1 for Xen DoS Vulnerabilities

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 4.0.1-5.7.

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.

Further information about...