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             Xen Security Advisory CVE-2011-1166 / XSA-1
  Host crash due to failure to correctly validate PV kernel execution state

ISSUE DESCRIPTION
=================

Cannot specify user mode execution without specifying user-mode
pagetables.  Failure to validate this allows a malicious or buggy
64 bit PV guest to crash the host.

nb: predates vulnerability handling process and therefore no formal
announcement
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