CVE-2016-2549: Input Validation
First published: Wed Feb 24 2016(Updated: )
Function hrtimer_cancel() waits for the completion from the callback, thus it must not be called inside the callback itself. This was already a problem in the past with ALSA hrtimer driver, and the early commit [fcfdebe70759: ALSA: hrtimer - Fix lock-up] tried to address it. Upstream patch: <a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2ba1fe7a06d3624f9a7586d672b55f08f7c670f3">http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2ba1fe7a06d3624f9a7586d672b55f08f7c670f3</a> Original report: <a href="http://marc.info/?l=linux-kernel&m=145271261602328">http://marc.info/?l=linux-kernel&m=145271261602328</a> <a href="http://marc.info/?l=linux-kernel&m=145288522219596">http://marc.info/?l=linux-kernel&m=145288522219596</a> <a href="http://marc.info/?t=145269725600010&r=1&w=2">http://marc.info/?t=145269725600010&r=1&w=2</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=2ba1fe7a06d3624f9a7586d672b55f08f7c670f3
- 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/83382
- 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=1311570
- https://github.com/torvalds/linux/commit/2ba1fe7a06d3624f9a7586d672b55f08f7c670f3
- https://launchpad.net/bugs/cve/CVE-2016-2549
- http://marc.info/?l=linux-kernel&m=145271261602328
- http://marc.info/?l=linux-kernel&m=145288522219596
- http://marc.info/?t=145269725600010&r=1&w=2
- http://seclists.org/oss-sec/2016/q1/133
- http://seclists.org/oss-sec/2016/q1/410
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1311573
- https://access.redhat.com/support/policy/updates/errata/
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2ba1fe7a06d3624f9a7586d672b55f08f7c670f3
- https://security-tracker.debian.org/tracker/CVE-2016-2549
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2549
- https://nvd.nist.gov/vuln/detail/CVE-2016-2549
- https://ubuntu.com/security/CVE-2016-2549
Frequently Asked Questions
What is the severity of CVE-2016-2549?
The severity of CVE-2016-2549 is low.
How does CVE-2016-2549 impact Linux kernel before version 4.4.1?
CVE-2016-2549 allows local users to cause a denial of service (deadlock) through a crafted ioctl call.
How can I fix CVE-2016-2549 on Ubuntu Linux?
To fix CVE-2016-2549 on Ubuntu, you need to update to Linux kernel version 3.2.0-102.142 or later.
Where can I find more information about CVE-2016-2549?
More information about CVE-2016-2549 can be found in the references: [link](http://www.openwall.com/lists/oss-security/2016/01/19/1), [link](http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2ba1fe7a06d3624f9a7586d672b55f08f7c670f3), [link](http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.1).
What is the affected software for CVE-2016-2549?
The affected software for CVE-2016-2549 includes Ubuntu Linux with kernel versions 3.2.0-102.142 to 4.4.1.
- collector/nvd-index
- agent/type
- agent/remedy
- collector/launchpad-cve
- source/Launchpad
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2016-2549
- agent/author
- agent/weakness
- agent/severity
- collector/mitre-cve
- source/MITRE
- collector/usn-cve
- source/Ubuntu
- agent/references
- agent/first-publish-date
- agent/description
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup
- agent/last-modified-date
- agent/tags
- agent/softwarecombine
- agent/event
- collector/security-tracker-debian
- source/Debian
- agent/trending
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/4.4
- package-manager/debian