The emulation of the instructions HLT, LGDT, LIDT, and LMSW fails to
perform supervisor mode permission checks.
Malicious HVM guest user mode code may be able to crash the guest or
escalate its own privilege to guest kernel mode.
Red Hat would like to thank the Xen for reporting this issue.
This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.
Created xen tracking bugs for this issue:
Affects: fedora-all [bug 1145737]