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:

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Debian Security Advisory DSA-2632-1                This email address is being protected from spambots. You need JavaScript enabled to view it.
http://www.debian.org/security/                           Dann Frazier
February 25, 2013                   http://www.debian.org/security/faq
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Package        : linux-2.6
Vulnerability  : privilege escalation/denial of service
Problem type   : local
Debian-specific: no
CVE Id(s)      : CVE-2013-0231 CVE-2013-0871

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:

                                             Debian 6.0 (squeeze)
     user-mode-linux                         2.6.32-1um-4+48squeeze1

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

Thanks to Micah Anderson for proof reading this text.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

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