Xen 3.4, 4.0, and 4.1, when the guest OS has not registered a handler for a syscall or sysenter instruction, does not properly clear a flag for exception injection when injecting a General Protection Fault, which allows local PV guest OS users to cause a denial of service (guest crash) by later triggering an exception that would normally be handled within Xen.
http://lists.xen.org/archives/html/xen-announce/2012-06/msg00003.html
http://secunia.com/advisories/55082
Published: 2012-12-03
Base Score: 1.9
Vector: CVSS2#AV:L/AC:M/Au:N/C:N/I:N/A:P
Severity: Low