Xen 3.1 through 4.x, when running 64-bit hosts on Intel CPUs, does not
clear the NT flag when using an IRET after a SYSENTER instruction,
which allows PV guest users to cause a denial of service (hypervisor
crash) by triggering a #GP fault, which is not properly handled by
another IRET instruction.
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] 20130418 Xen Security Advisory 44 (CVE-2013-1917) - Xen PV DoS vulnerability with SYSENTER
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