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Date: Tue, 6 Nov 2012 19:30:40 +0100
From: Petr Matousek <>
Subject: CVE-2012-4461 -- kernel: kvm: invalid opcode oops on SET_SREGS with
 OSXSAVE bit set

A flaw has been found in the way Linux kernel's KVM subsystem handled
vcpu->arch.cr4 X86_CR4_OSXSAVE bit set upon guest enter. On hosts
without the XSAVE feature and using qemu userspace an unprivileged
local user could use this flaw to crash the system.


Red Hat would like to thank Jon Howell for reporting this issue.

Proposed upstream fix:


Petr Matousek / Red Hat Security Response Team

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