The x86_emulate function in arch/x86/x86_emulate/x86_emulate.c in Xen
4.4.x and earlier does not properly check supervisor mode permissions,
which allows local HVM users to cause a denial of service (guest
crash) or gain guest kernel mode privileges via vectors involving an
(1) HLT, (2) LGDT, (3) LIDT, or (4) LMSW instruction.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
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disclosed, or updated in CVE.
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