The xen_failsafe_callback function in Xen for the Linux kernel 2.6.23
and other versions, when running a 32-bit PVOPS guest, allows local
users to cause a denial of service (guest crash) by triggering an iret
fault, leading to use of an incorrect stack pointer and stack
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MLIST:[oss-security] 20130116 Xen Security Advisory 40 (CVE-2013-0190) - Linux stack corruption in xen_failsafe_callback for 32bit PVOPS guests.
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