CVE-2017-13672 Qemu: vga: OOB read access during display update

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

  Hello,

Quick emulator(Qemu) built with the VGA display emulator support is vulnerable 
to an out-of-bounds read access issue. It could occur while reading VGA memory 
to update graphics display.

A privileged user/process inside guest could use this flaw to crash the Qemu 
process on the host resulting in DoS situation.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2017-08/msg04684.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1486560

This issue was reported by David Buchanan.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
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