CVE-2016-2391: Null Pointer Dereference
First published: Thu Feb 04 2016(Updated: )
Qemu emulator built with the USB OHCI emulation support is vulnerable to a null pointer dereference issue. It could occur when OHCI transitions to a OHCI_USB_OPERATIONAL state, leading to creation of multiple eof timers. A privileged user inside guest could use this flaw to crash the Qemu process on the host, resulting in DoS. Upstream patch: --------------- -> <a href="https://lists.gnu.org/archive/html/qemu-devel/2016-02/msg03471.html">https://lists.gnu.org/archive/html/qemu-devel/2016-02/msg03471.html</a> Reference: ---------- -> <a href="http://www.openwall.com/lists/oss-security/2016/02/16/2">http://www.openwall.com/lists/oss-security/2016/02/16/2</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU KVM | <=2.5.1.1 | |
| Ubuntu | =12.04 | |
| Ubuntu | =14.04 | |
| Ubuntu | =15.10 | |
| Ubuntu | =16.04 | |
| Debian | =8.0 |
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Reference Links
- http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=fa1298c2d623522eda7b4f1f721fcb935abb7360
- http://www.openwall.com/lists/oss-security/2016/02/16/2
- http://www.securityfocus.com/bid/83263
- http://www.ubuntu.com/usn/USN-2974-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1304794
- https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
- https://lists.gnu.org/archive/html/qemu-devel/2016-02/msg03374.html
- https://lists.gnu.org/archive/html/qemu-devel/2016-02/msg03471.html
- https://access.redhat.com/support/policy/updates/errata/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1308882
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1308881
- http://seclists.org/oss-sec/2016/q1/349
Frequently Asked Questions
What is the severity of CVE-2016-2391?
CVE-2016-2391 is considered a high-severity vulnerability due to its impact on system stability.
How do I fix CVE-2016-2391?
To fix CVE-2016-2391, update QEMU to the latest version or apply the relevant patches provided by your operating system vendor.
What type of vulnerability is CVE-2016-2391?
CVE-2016-2391 is a null pointer dereference vulnerability affecting QEMU's USB OHCI emulation.
Who is affected by CVE-2016-2391?
CVE-2016-2391 affects privileged users operating within guest environments on systems running vulnerable versions of QEMU.
What are the potential impacts of CVE-2016-2391?
The potential impact of CVE-2016-2391 includes crashing the QEMU process, leading to Denial of Service (DoS) conditions for VMs.
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- version/debian/8.0