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TITLE:
Xen "hypervisor_callback()" Denial of Service

SECUNIA ADVISORY ID:
SA35093

VERIFY ADVISORY:
http://secunia.com/advisories/35093/

DESCRIPTION:
A vulnerability has been reported in Xen, which can be exploited by
malicious, local users to cause a DoS (Denial of Service).

The vulnerability is caused due to an error within the
"hypervisor_callback()" function in arch/i386/kernel/entry-xen.S,
which can be exploited out of a 32bit x86 guest system to cause a
kernel oops and potentially crash the guest system.

SOLUTION:
Fixed in the Mercurial repository.

PROVIDED AND/OR DISCOVERED BY:
Jan Beulich

ORIGINAL ADVISORY:
http://lists.xensource.com/archives/html/xen-devel/2009-05/msg00561.html

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