I rate this critical some people got owned by this bug. Patches to follow.
Created attachment 91683 [details, diff] patch against xen-sources-2.6.16.18.patch ebuild
Created attachment 91684 [details, diff] files/xen-sources-2.6.16.18-CVE-2006-2451.patch patch taken from http://lists.xensource.com/archives/html/xen-devel/2006-07/msg00425.html
Duping against the main bug; this is fixed in 2.6.16.24 to which xen-sources should be updated instead. *** This bug has been marked as a duplicate of 139475 ***