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Date: Mon, 18 Apr 2016 11:45:05 -0400 (EDT)
From: cve-assign@...re.org
To: ppandit@...hat.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com, dushaobo@....cn
Subject: Re: Qemu: usb: Infinite loop vulnerability in usb_ehci using siTD process

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> 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 privileged user 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.
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1325129
> https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg02691.html

Use CVE-2016-4037.

This is not yet available at
http://git.qemu.org/?p=qemu.git;a=history;f=hw/usb/hcd-ehci.c but
that may be an expected place for a later update.

- -- 
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
[ A PGP key is available for encrypted communications at
  http://cve.mitre.org/cve/request_id.html ]
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