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Bug 593956 (CVE-2016-7422) - <app-emulation/qemu-2.7.0-r3: virtio: null pointer dereference in virtqueu_map_desc (CVE-2016-7422)
Summary: <app-emulation/qemu-2.7.0-r3: virtio: null pointer dereference in virtqueu_ma...
Alias: CVE-2016-7422
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal minor (vote)
Assignee: Gentoo Security
Whiteboard: B3 [glsa cve]
Depends on: CVE-2016-7157
  Show dependency tree
Reported: 2016-09-16 10:38 UTC by Agostino Sarubbo
Modified: 2016-09-26 00:40 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description Agostino Sarubbo gentoo-dev 2016-09-16 10:38:32 UTC
From ${URL} :

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.

Upstream fix:

@maintainer(s): after the bump, in case we need to stabilize the package, please let us know if it is ready for the stabilization or not.
Comment 1 Matthias Maier gentoo-dev 2016-09-18 04:37:23 UTC
commit b50850bf14489740441b408a2d45f6e64d724f7d
Author: Matthias Maier <>
Date:   Sat Sep 17 23:02:53 2016 -0500

    app-emulation/qemu: security fixes, ebuild maintenance
    bug 593956: CVE-2016-7422
    bug 593950: CVE-2016-7421
    bug 590230: missing use depend opengl? ( media-libs/mesa[...,gbm] )
    bug 575326: update to readme.gentoo-r1 eclass
    Package-Manager: portage-2.2.28
Comment 2 Yury German Gentoo Infrastructure gentoo-dev 2016-09-25 23:13:45 UTC
Arches and Maintainer(s), Thank you for your work.
Added to an existing GLSA Request.

Maintainer(s), please drop the vulnerable version(s) - Cleanup Bug #593038
Comment 3 GLSAMaker/CVETool Bot gentoo-dev 2016-09-26 00:40:02 UTC
This issue was resolved and addressed in
 GLSA 201609-01 at
by GLSA coordinator Yury German (BlueKnight).