CVE-2016-2545: Race Condition
First published: Wed Feb 24 2016(Updated: )
ALSA timer instance object has a couple of linked lists and they are unlinked unconditionally at snd_timer_stop(). Meanwhile snd_timer_interrupt() unlinks it, but it calls list_del() which leaves the element list itself unchanged. This ends up with unlinking twice, and it was caught by syzkaller fuzzer. Upstream patch: <a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ee8413b01045c74340aa13ad5bdf905de32be736">http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ee8413b01045c74340aa13ad5bdf905de32be736</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 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ee8413b01045c74340aa13ad5bdf905de32be736
- 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/83381
- http://www.securitytracker.com/id/1035296
- 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=1311560
- https://github.com/torvalds/linux/commit/ee8413b01045c74340aa13ad5bdf905de32be736
- https://launchpad.net/bugs/cve/CVE-2016-2545
- 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=ee8413b01045c74340aa13ad5bdf905de32be736
- https://security-tracker.debian.org/tracker/CVE-2016-2545
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2545
- https://nvd.nist.gov/vuln/detail/CVE-2016-2545
- https://ubuntu.com/security/CVE-2016-2545
Frequently Asked Questions
What is the severity of CVE-2016-2545?
The severity of CVE-2016-2545 is low.
How does CVE-2016-2545 affect Linux kernel?
CVE-2016-2545 affects the snd_timer_interrupt function in sound/core/timer.c in the Linux kernel before version 4.4.1.
What is the impact of CVE-2016-2545?
The impact of CVE-2016-2545 is a denial of service (race condition and system crash) caused by a crafted ioctl call.
How can I fix CVE-2016-2545?
To fix CVE-2016-2545, update the Linux kernel to version 4.4.1 or later.
Where can I find more information about CVE-2016-2545?
You can find more information about CVE-2016-2545 on the following references: [1] [2] [3]
- collector/nvd-index
- agent/type
- collector/launchpad-cve
- source/Launchpad
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2016-2545
- agent/author
- agent/severity
- agent/weakness
- collector/mitre-cve
- source/MITRE
- collector/usn-cve
- source/Ubuntu
- agent/remedy
- agent/references
- agent/tags
- agent/first-publish-date
- agent/description
- agent/event
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup
- agent/last-modified-date
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- agent/trending
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/4.4
- package-manager/debian