The (1) XENMEM_decrease_reservation, (2) XENMEM_populate_physmap, and
(3) XENMEM_exchange hypercalls in Xen 4.2 and earlier allow local
guest administrators to cause a denial of service (long loop and hang)
via a crafted extent_order value.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[Xen-announce] 20121203 Xen Security Advisory 31 (CVE-2012-5515) - Several memory hypercall operations allow invalid extent order values
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