Xen 3.0.3 through 4.1.x (possibly 126.96.36.199), 4.2.x (possibly 4.2.3),
and 4.3.x (possibly 4.3.1) does not properly prevent access to
hypercalls, which allows local guest users to gain privileges via a
crafted application running in ring 1 or 2.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[oss-security] 20131126 Xen Security Advisory 76 (CVE-2013-4554) - Hypercalls exposed to privilege rings 1 and 2 of HVM guests
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