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Date: Mon, 18 Apr 2016 17:44:21 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: dushaobo@....cn
Subject: Qemu: usb: Infinite loop vulnerability in usb_ehci using siTD
 process

   Hello,

Qemu emulator built with the USB EHCI emulation support is vulnerable to an 
infinite loop issue. It occurs during communication between host controller 
interface(EHCI) and a respective device driver. These two communicate via a 
split isochronous transfer descriptor list(siTD) and an infinite loop unfolds 
if there is a closed loop in this list.

A privileges used inside guest could use this flaw to consume excessive CPU 
cycles & resources on the host.

This issue is similar to CVE-2015-8558, but using siTD instead of iTD.

Upstream patch:
---------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg02691.html

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1325129

This issue are discovered by Du Shaobo of Qihoo 360 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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