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Xen mov_to_rr RID Local Security Bypass Vulnerability

References:

• [Xen-ia64-devel] PATCH: check r2 value for VTi mov rr[r3]=r2 (XenSource)
  
• Changelog for xen-3.1-testing (XenSource)
  
• XenSource Homepage (XenSource)
  
• RHSA-2008:0154-15 kernel security and bug fix update (Red Hat)