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Date: Thu, 29 Oct 2009 11:18:01 +0800
From: Eugene Teo <>
CC: "Steven M. Christey" <>
Subject: CVE request: kvm: check cpl before emulating debug register access

Quote from the upstream commit:
"Debug registers may only be accessed from cpl 0.  Unfortunately, vmx 
will code to emulate the instruction even though it was issued from 
guest userspace, possibly leading to an unexpected trap later."

Introduced in v2.6.30-rc1; Fixed in v2.6.32-rc1.

Thanks, Eugene
Eugene Teo / Red Hat Security Response Team

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