CVE-2018-7550 Qemu: i386: multiboot OOB access while loading kernel image

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

  Hello,

Quick Emulator(QEMU) built with the PC System Emulator with multiboot feature 
support is vulnerable to an OOB r/w memory access issue. It could occur while 
loading a kernel image during a guest boot if multiboot head addresses 
mh_load_end_addr was greater than mh_bss_end_addr.

A user/process could use this flaw to potentially achieve arbitrary code 
execution on a host.

Upstream patch:
---------------
  -> https://lists.nongnu.org/archive/html/qemu-devel/2018-03/msg01885.html

This issue was reported by Cyrille Chatras of Orange.com.

CVE-2018-7550 assigned via -> https://cveform.mitre.org/

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