Some vulnerabilities have been reported in Xen, which can be exploited by malicious, local users to cause a DoS (Denial of Service).
The vulnerabilities are caused due to the backend drivers leaking references to kernel threads, which can be exploited out of a guest virtual machine to e.g. prevent a proper virtual machine shutdown and stop the "xm" commands from working correctly.
Solution: Fixed in the Mercurial repository.
Provided and/or discovered by: Disclosed in a Mercurial commit.
Original Advisory: http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/59f097ef181b
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Subject: Xen Backend Drivers Kernel Thread Leak Denial of Service Vulnerabilities