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Date: Mon, 14 Dec 2015 16:36:03 -0500 (EST)
From: cve-assign@...re.org
To: ppandit@...hat.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com, luodalongde@...il.com, kraxel@...hat.com
Subject: Re: CVE request Qemu: usb: infinite loop in ehci_advance_state results in DoS

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

> 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
> isochronous transfer descriptor list(iTD) and an infinite loop unfolds if
> there is a closed loop in this list.
> 
> A privileges user inside guest could use this flaw to consume excessive CPU
> cycles & resources on the host.
> 
> https://lists.gnu.org/archive/html/qemu-devel/2015-12/msg02124.html

>> Make ehci_process_itd return an error in case we didn't do any actual
>> iso transfer because we've found no active transaction.  That'll avoid
>> ehci happily run in circles forever if the guest builds a loop out of
>> idts.

Use CVE-2015-8558.

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, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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