CVE-2016-6197: Input Validation
First published: Tue Jul 12 2016(Updated: )
fs/overlayfs/dir.c in the OverlayFS filesystem implementation in the Linux kernel before 4.6 does not properly verify the upper dentry before proceeding with unlink and rename system-call processing, which allows local users to cause a denial of service (system crash) via a rename system call that specifies a self-hardlink.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Oracle Linux | =6 | |
| Linux Linux kernel | <=4.5.7 | |
| Oracle VM Server | =3.4 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=11f3710417d026ea2f4fcf362d866342c5274185
- http://rhn.redhat.com/errata/RHSA-2016-1847.html
- http://rhn.redhat.com/errata/RHSA-2016-1875.html
- http://www.openwall.com/lists/oss-security/2016/07/11/8
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://www.securityfocus.com/bid/91709
- http://www.securitytracker.com/id/1036273
- http://www.ubuntu.com/usn/USN-3070-1
- http://www.ubuntu.com/usn/USN-3070-2
- http://www.ubuntu.com/usn/USN-3070-3
- http://www.ubuntu.com/usn/USN-3070-4
- https://bugzilla.redhat.com/show_bug.cgi?id=1355650
- https://github.com/torvalds/linux/commit/11f3710417d026ea2f4fcf362d866342c5274185
- https://launchpad.net/bugs/cve/CVE-2016-6197
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=11f3710417d026ea2f4fcf362d866342c5274185
- http://seclists.org/oss-sec/2016/q3/42
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1355651
- https://git.kernel.org/linus/11f3710417d026ea2f4fcf362d866342c5274185
- https://security-tracker.debian.org/tracker/CVE-2016-6197
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6197
- https://nvd.nist.gov/vuln/detail/CVE-2016-6197
- https://ubuntu.com/security/CVE-2016-6197
Frequently Asked Questions
What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2016-6197.
What is the severity of CVE-2016-6197?
The severity of CVE-2016-6197 is medium.
Which Linux kernel versions are affected by CVE-2016-6197?
Linux kernel versions before 4.6 are affected by CVE-2016-6197.
How can local users exploit CVE-2016-6197?
Local users can exploit CVE-2016-6197 by using a rename system call that triggers a denial of service, causing a system crash.
Is there a fix available for CVE-2016-6197?
Yes, a fix for CVE-2016-6197 is available in Linux kernel version 4.6 and later.
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