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

[P J P <ppandit () redhat com>]

  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

Attachment: KVM-MTRR-remove-MSR-0x2f8.patch
Description: