CVE-2016-2547: Race Condition
First published: Wed Feb 24 2016(Updated: )
A slave timer instance might be still accessible in a racy way while operating the master instance as it lacks of locking. Since the master operation is mostly protected with timer->lock, we should cope with it while changing the slave instance, too. Upstream patch: <a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b5a663aa426f4884c71cd8580adae73f33570f0d">http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b5a663aa426f4884c71cd8580adae73f33570f0d</a> External references: <a href="http://marc.info/?l=linux-kernel&m=145269654327048">http://marc.info/?l=linux-kernel&m=145269654327048</a> <a href="https://gist.githubusercontent.com/dvyukov/e833610757b098956b50/raw/d819cd13b466e4adbe3dd825ee481e4512e77633/gistfile1.txt">https://gist.githubusercontent.com/dvyukov/e833610757b098956b50/raw/d819cd13b466e4adbe3dd825ee481e4512e77633/gistfile1.txt</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=b5a663aa426f4884c71cd8580adae73f33570f0d
- 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/83378
- http://www.securitytracker.com/id/1035298
- 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=1311566
- https://github.com/torvalds/linux/commit/b5a663aa426f4884c71cd8580adae73f33570f0d
- https://launchpad.net/bugs/cve/CVE-2016-2547
- http://marc.info/?l=linux-kernel&m=145269654327048
- https://gist.githubusercontent.com/dvyukov/e833610757b098956b50/raw/d819cd13b466e4adbe3dd825ee481e4512e77633/gistfile1.txt
- 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://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1311568
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b5a663aa426f4884c71cd8580adae73f33570f0d
- https://security-tracker.debian.org/tracker/CVE-2016-2547
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2547
- https://nvd.nist.gov/vuln/detail/CVE-2016-2547
- https://ubuntu.com/security/CVE-2016-2547
Frequently Asked Questions
What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2016-2547.
What is the severity level of CVE-2016-2547?
The severity level of CVE-2016-2547 is medium with a value of 4.
What software versions are affected by CVE-2016-2547?
The affected software versions are Linux kernel versions before 4.4.1.
How can this vulnerability be exploited?
This vulnerability can be exploited by local users through a crafted ioctl call, which can lead to a denial of service, race condition, use-after-free, and system crash.
Is there a fix available for CVE-2016-2547?
Yes, a fix is available in Linux kernel version 4.4.1 and later.
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