CVE-2016-2543: Null Pointer Dereference
First published: Wed Feb 24 2016(Updated: )
A null dereference vulnerability was found in the Linux kernel. Function snd_seq_ioctl_remove_events() calls snd_seq_fifo_clear() unconditionally even if there is no FIFO assigned, and this leads to an Oops due to NULL dereference. The fix is just to add a proper NULL check. Upstream patch: <a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=030e2c78d3a91dd0d27fef37e91950dde333eba1">http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=030e2c78d3a91dd0d27fef37e91950dde333eba1</a> External references: <a href="https://lkml.org/lkml/2016/1/12/215">https://lkml.org/lkml/2016/1/12/215</a> CVE-ID request and assignment: <a href="http://seclists.org/oss-sec/2016/q1/133">http://seclists.org/oss-sec/2016/q1/133</a> <a href="http://seclists.org/oss-sec/2016/q1/410">http://seclists.org/oss-sec/2016/q1/410</a>
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <=4.4 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=030e2c78d3a91dd0d27fef37e91950dde333eba1
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html
- http://www.debian.org/security/2016/dsa-3503
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.1
- http://www.openwall.com/lists/oss-security/2016/01/19/1
- http://www.securityfocus.com/bid/83377
- http://www.securitytracker.com/id/1035304
- http://www.ubuntu.com/usn/USN-2929-1
- http://www.ubuntu.com/usn/USN-2929-2
- http://www.ubuntu.com/usn/USN-2930-1
- http://www.ubuntu.com/usn/USN-2930-2
- http://www.ubuntu.com/usn/USN-2930-3
- http://www.ubuntu.com/usn/USN-2931-1
- http://www.ubuntu.com/usn/USN-2932-1
- http://www.ubuntu.com/usn/USN-2967-1
- http://www.ubuntu.com/usn/USN-2967-2
- https://bugzilla.redhat.com/show_bug.cgi?id=1311554
- https://github.com/torvalds/linux/commit/030e2c78d3a91dd0d27fef37e91950dde333eba1
- https://launchpad.net/bugs/cve/CVE-2016-2543
- https://lkml.org/lkml/2016/1/12/215
- http://seclists.org/oss-sec/2016/q1/133
- http://seclists.org/oss-sec/2016/q1/410
- https://access.redhat.com/support/policy/updates/errata/
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=030e2c78d3a91dd0d27fef37e91950dde333eba1
- https://security-tracker.debian.org/tracker/CVE-2016-2543
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2543
- https://nvd.nist.gov/vuln/detail/CVE-2016-2543
- https://ubuntu.com/security/CVE-2016-2543
Frequently Asked Questions
What is CVE-2016-2543?
CVE-2016-2543 is a vulnerability in the Linux kernel that allows local users to cause a denial of service (NULL pointer dereference and OOPS) via a crafted ioctl call.
How does CVE-2016-2543 affect the Linux kernel?
CVE-2016-2543 affects the snd_seq_ioctl_remove_events function in sound/core/seq/seq_clientmgr.c in the Linux kernel before version 4.4.1.
What is the severity of CVE-2016-2543?
CVE-2016-2543 has a severity level of low.
How can I fix CVE-2016-2543?
To fix CVE-2016-2543, update your Linux kernel to version 4.4.1 or higher.
Where can I find more information about CVE-2016-2543?
You can find more information about CVE-2016-2543 at the following references: [Reference 1](http://www.openwall.com/lists/oss-security/2016/01/19/1), [Reference 2](http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=030e2c78d3a91dd0d27fef37e91950dde333eba1), [Reference 3](http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.1).
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