linux-2.6 - several vulnerabilities

Several vulnerabilities have been discovered in the Linux kernel that may lead
to a denial of service or privilege escalation. The Common Vulnerabilities and
Exposures project identifies the following problems:

• CVE-2013-0231
  Jan Beulich provided a fix for an issue in the Xen PCI backend drivers.
  Users of guests on a system using passed-through PCI devices can create
  a denial of service of the host system due to the use of non-ratelimited
  kernel log messages.
• CVE-2013-0871
  Suleiman Souhlal and Salman Qazi of Google, with help from Aaron Durbin
  and Michael Davidson of Google, discovered an issue in the
  ptrace subsystem. Due to a race condition with PTRACE_SETREGS, local users
  can cause kernel stack corruption and execution of arbitrary code.

For the stable distribution (squeeze), this problem has been fixed in version
2.6.32-48squeeze1.

The following matrix lists additional source packages that were rebuilt for
compatibility with or to take advantage of this update:

We recommend that you upgrade your linux-2.6 and user-mode-linux packages.