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Date: Mon, 16 May 2016 17:30:16 +0530 (IST)
From: P J P <>
To: oss security list <>
cc: Radim Krcmar <>, Paolo Bonzini <>,
        Salvatore Bonaccorso <>
Subject: CVE-2016-3713 Linux kernel: kvm: OOB r/w access issue with MSR


Linux kernel built with the Kernel-based Virtual Machine(CONFIG_KVM) with 
variable Memory Type Range Registers(MTRR) support is vulnerable to an 
out-of-bounds r/w access issue. It could occur while accessing processor's 
MTRRs via ioctl(2) calls.

A privileged user inside guest could use this flaw to manipulate host kernel's 
memory bytes leading to information disclosure OR potentially crashing the 
kernel resulting in DoS.

'CVE-2016-3713' has been assigned to this issue by Red Hat Inc. A proposed 
patch is attached herein to fix this issue.


This issue was reported by Mr David Matlack of Google Inc.

Thank you.
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
View attachment "KVM-MTRR-remove-MSR-0x2f8.patch" of type "text/plain" (1644 bytes)

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