Multiple vulnerabilities have been found in Xen, allowing attackers
on a Xen Virtual Machine to execute arbitrary code, cause Denial of
Service, or gain access to data on the host.
Multiple vulnerabilities have been discovered in Xen. Please review the
CVE identifiers referenced below for details.
Impact
Guest domains could possibly gain privileges, execute arbitrary code, or
cause a Denial of Service on the host domain (Dom0). Additionally, guest
domains could gain information about other virtual machines running on
the same host or read arbitrary files on the host.
Workaround
The CVEs listed below do not currently have fixes, but only apply to Xen
setups which have “tmem” specified on the hypervisor command line.
TMEM is not currently supported for use in production systems, and
administrators using tmem should disable it.
Relevant CVEs:
* CVE-2012-2497
* CVE-2012-6030
* CVE-2012-6031
* CVE-2012-6032
* CVE-2012-6033
* CVE-2012-6034
* CVE-2012-6035
* CVE-2012-6036
Resolution
All Xen users should upgrade to the latest version:
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.