Improper Supervisor Mode Permissions in Xen x86_emulate Function

CVE-2014-7155 · MEDIUM Severity

AV:A/AC:L/AU:N/C:P/I:P/A:P

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.

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