oss-security - CVE-2016-3713 Linux kernel: kvm: OOB r/w access issue with MSR 0x2F8

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Message-ID: <alpine.LFD.2.20.1605161718050.4904@wniryva>
Date: Mon, 16 May 2016 17:30:16 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Radim Krcmar <rkrcmar@...hat.com>, Paolo Bonzini <pbonzini@...hat.com>,
        Salvatore Bonaccorso <carnil@...ian.org>
Subject: CVE-2016-3713 Linux kernel: kvm: OOB r/w access issue with MSR
 0x2F8

   Hello,

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.

Reference:
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1332139

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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