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

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Debian Security Advisory DSA-2636-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
http://www.debian.org/security/                        Moritz Muehlenhoff
March 01, 2013                         http://www.debian.org/security/faq
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Package        : xen
Vulnerability  : several
Problem type   : remote
Debian-specific: no
CVE ID         : CVE-2012-4544 CVE-2012-5511 CVE-2012-5634 CVE-2013-0153
Debian Bug     : 

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 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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