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Date: Mon, 14 Dec 2015 12:16:50 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Qinghao Tang <luodalongde@...il.com>
Subject: CVE-2015-7549 Qemu: pci: msi-x: null pointer dereference issue

   Hello,

Qemu emulator built with the PCI MSI-X support is vulnerable to null pointer 
dereference issue. It occurs when the controller attempts to write to the 
pending bit array(PBA) memory region. Because the MSI-X MMIO support did not 
define the .write method.

A privileges used inside guest could use this flaw to crash the Qemu process 
resulting in DoS issue.

Upstream fix:
-------------
   -> http://git.qemu.org/?p=qemu.git;a=commit;h=43b11a91dd861a946b231b89b754285

CVE-2015-7549 has been assigned to this issue by Red Hat Inc.

This issue was reported by Qinghao Tang of QIHU 360 Marvel Team.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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