CVE-2016-7422: Null Pointer Dereference
First published: Fri Sep 16 2016(Updated: )
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: ------------- -> <a href="https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg03546.html">https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg03546.html</a> Reference: ---------- -> <a href="http://www.openwall.com/lists/oss-security/2016/09/16/4">http://www.openwall.com/lists/oss-security/2016/09/16/4</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU KVM | <=2.7.1 | |
| openSUSE | =42.2 | |
| redhat openstack | =6.0 | |
| redhat openstack | =7.0 | |
| redhat openstack | =8 | |
| redhat openstack | =9 | |
| redhat openstack | =10 | |
| redhat openstack | =11 | |
| Red Hat Enterprise Virtualization | =4.0 | |
| Red Hat Enterprise Linux | =7.0 |
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Reference Links
- http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=973e7170dddefb491a48df5cba33b2ae151013a0
- http://lists.opensuse.org/opensuse-updates/2016-12/msg00140.html
- http://www.openwall.com/lists/oss-security/2016/09/16/10
- http://www.openwall.com/lists/oss-security/2016/09/16/4
- http://www.securityfocus.com/bid/92996
- https://access.redhat.com/errata/RHSA-2017:2392
- https://access.redhat.com/errata/RHSA-2017:2408
- https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg03546.html
- https://security.gentoo.org/glsa/201609-01
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1376756
- https://bugzilla.redhat.com/show_bug.cgi?id=1376755
Frequently Asked Questions
What is the severity of CVE-2016-7422?
CVE-2016-7422 is classified as a denial of service (DoS) vulnerability due to a null pointer dereference flaw.
How do I fix CVE-2016-7422?
To fix CVE-2016-7422, update QEMU to a version higher than 2.7.1 that includes the relevant patches.
Which software versions are affected by CVE-2016-7422?
CVE-2016-7422 affects QEMU versions up to 2.7.1 and specific versions of Red Hat OpenStack and openSUSE.
Who can exploit CVE-2016-7422?
A privileged user inside the guest environment can exploit CVE-2016-7422 to crash the QEMU instance on the host.
What impact does CVE-2016-7422 have on systems?
The impact of CVE-2016-7422 is a potential denial of service, as it can cause the QEMU instance to crash.
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