kernel security update

kernel: 2.6.18-308.8.2.el5 - xen x8664: check address on trap handlers or guest callbacks Paolo Bonzini 813430 813431 CVE-2012-0217 - xen x8664: Do not execute sysret with a non-canonical return address Paolo Bonzini 813430 813431 CVE-2012-0217 - xen x86: prevent hv boot on AMD CPUs with Erratum...