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Debian Security Advisory DSA-3633-1                   security@debian.org
https://www.debian.org/security/                       Moritz Muehlenhoff
July 27, 2016                         https://www.debian.org/security/faq
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Package        : xen
CVE ID         : CVE-2015-8338 CVE-2016-4480 CVE-2016-4962 CVE-2016-5242 
                 CVE-2016-6258

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

CVE-2015-8338

    Julien Grall discovered that Xen on ARM was susceptible to denial
    of service via long running memory operations.

CVE-2016-4480

    Jan Beulich discovered that incorrect page table handling could
    result in privilege escalation inside a Xen guest instance.

CVE-2016-4962

    Wei Liu discovered multiple cases of missing input sanitising in
    libxl which could result in denial of service.

CVE-2016-5242

    Aaron Cornelius discovered that incorrect resource handling on
    ARM systems could result in denial of service.

CVE-2016-6258

    Jeremie Boutoille discovered that incorrect pagetable handling in
    PV instances could result in guest to host privilege escalation.

For the stable distribution (jessie), these problems have been fixed in
version 4.4.1-9+deb8u6.

For the unstable distribution (sid), these problems will be fixed soon.

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: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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