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Date: Wed, 25 Nov 2009 16:03:33 +0800
From: Eugene Teo <>
CC: "Steven M. Christey" <>
Subject: CVE request: kernel: KVM: x86 emulator: limit instructions to 15

Quoting from the patch: "While we are never normally passed an 
instruction that exceeds 15 bytes, smp games can cause us to attempt to 
interpret one, which will cause large latencies in non-preempt hosts.";a=commitdiff;h=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88

I understand that a malicious guest can cause long scheduling latencies 
in the host, resulting in a denial of service, but I have not 
investigated this further to determine if it has more severe consequences.

Thanks, Eugene
Eugene Teo / Red Hat Security Response Team

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