oss-security - CVE request Qemu: ide: ahci null pointer dereference when using FIS CLB engines

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Date: Fri, 29 Jan 2016 12:06:55 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: zuozhi.fzz@...baba-inc.com
Subject: CVE request Qemu: ide: ahci null pointer dereference when using FIS
 CLB engines

   Hello,

Qemu emulator built with an IDE AHCI emulation support is vulnerable to a null 
pointer dereference flaw. It occurs while unmapping the Frame Information 
Structure(FIS) & Command List Block(CLB) entries.

A privileged user inside guest could use this flaw to crash the Qemu process 
instance resulting in DoS.

Upstream patch:
---------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg05742.html

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1302057

This issue was discovered by Mr Zuozhi Fzz of Alibaba Inc.

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

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