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Date: Fri, 16 Sep 2016 13:24:32 -0400 (EDT)
From: cve-assign@...re.org
To: ppandit@...hat.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com, luodalongde@...il.com, zhenhaohong@...il.com
Subject: Re: CVE request Qemu: virtio: null pointer dereference in virtqueu_map_desc

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> Quick emulator(Qemu) built with the virtio framework is vulnerable to a null
> pointer dereference flaw. It could occur if the guest was to set the I/O
> descriptor buffer length to a large value.
> 
> A privileged user inside guest could use this flaw to crash the Qemu instance
> on the host resulting in DoS.
> 
> https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg03546.html
> https://bugzilla.redhat.com/show_bug.cgi?id=1376755

>> virtio back end uses set of buffers to facilitate I/O operations.
>> If its size is too large, 'cpu_physical_memory_map' could return
>> a null address. This would result in a null dereference
>> while un-mapping descriptors. Add check to avoid it.

Use CVE-2016-7422.

This is not yet available at
http://git.qemu.org/?p=qemu.git;a=history;f=hw/virtio/virtio.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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