Bug 1376731 (CVE-2016-7421) - CVE-2016-7421 Qemu: scsi: pvscsi: infinite loop when processing IO requests
Summary: CVE-2016-7421 Qemu: scsi: pvscsi: infinite loop when processing IO requests
Alias: CVE-2016-7421
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1376733
Blocks: 1326713
TreeView+ depends on / blocked
Reported: 2016-09-16 09:26 UTC by Prasad J Pandit
Modified: 2021-02-17 03:20 UTC (History)
39 users (show)

Fixed In Version:
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Last Closed: 2018-01-16 10:25:21 UTC

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Description Prasad J Pandit 2016-09-16 09:26:27 UTC
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

  -> http://www.openwall.com/lists/oss-security/2016/09/16/3

Comment 1 Prasad J Pandit 2016-09-16 09:28:04 UTC
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1376733]

Comment 2 Prasad J Pandit 2016-09-16 09:39:52 UTC

Name: Li Qiang, Victor V (360.cn Inc.)

Comment 3 Cole Robinson 2016-10-15 23:49:43 UTC
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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