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Bug 1376731 - (CVE-2016-7421) CVE-2016-7421 Qemu: scsi: pvscsi: infinite loop when processing IO requests
CVE-2016-7421 Qemu: scsi: pvscsi: infinite loop when processing IO requests
Status: CLOSED WONTFIX
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20160907,reported=2...
: Security
Depends On: 1376733
Blocks: 1326713
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Reported: 2016-09-16 05:26 EDT by Prasad J Pandit
Modified: 2018-01-16 05:25 EST (History)
39 users (show)

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Last Closed: 2018-01-16 05:25:21 EST
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Description Prasad J Pandit 2016-09-16 05:26:27 EDT 
Quick Emulator(Qemu) built with the VMWARE PVSCSI paravirtual SCSI bus
emulation support is vulnerable to an infinite loop issue.
It could occur while processing SCSI IO requests.

A privileged user inside guest could use this flaw to crash the Qemu process
resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg03609.html

Reference:
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  -> http://www.openwall.com/lists/oss-security/2016/09/16/3
Comment 1 Prasad J Pandit 2016-09-16 05:28:04 EDT 
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1376733]
Comment 2 Prasad J Pandit 2016-09-16 05:39:52 EDT 
Acknowledgements:

Name: Li Qiang, Victor V (360.cn Inc.)
Comment 3 Cole Robinson 2016-10-15 19:49:43 EDT 
commit d251157ac1928191af851d199a9ff255d330bec9
Author: Prasad J Pandit <pjp@fedoraproject.org>
Date:   Wed Sep 14 15:09:12 2016 +0530

    scsi: pvscsi: limit process IO loop to ring size
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