oss-security - CVE request Qemu: i386: leakage of stack memory to guest in kvmvapic.c

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Message-ID: <alpine.LFD.2.20.1604132336250.29012@wniryva>
Date: Wed, 13 Apr 2016 23:38:26 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Donghai Zdh <donghai.zdh@...baba-inc.com>
Subject: CVE request Qemu: i386: leakage of stack memory to guest in
 kvmvapic.c

   Hello,

Qemu emulator built with the Task Priority Register(TPR) optimizations for 
32-bit Windows guests, is vulnerable to a information leakage issue. It could 
occur while accessing Task Priority Register(TPR).

A privileged user/process inside guest could use this issue to leak host 
memory bytes.

Upstream patch:
---------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg01118.html

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1313686

This issue was discovered by Donghai Zdh 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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