CVE-2016-6197

Description

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.

Category

5.5
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.04%
Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory oracle.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html vendor advisory
http://www.ubuntu.com/usn/USN-3070-1 vendor advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1355650 issue tracking
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=11f3710417d026ea2f4fcf362d866342c5274185 issue tracking patch
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html third party advisory
http://rhn.redhat.com/errata/RHSA-2016-1847.html vendor advisory
http://www.securityfocus.com/bid/91709 vdb entry
http://rhn.redhat.com/errata/RHSA-2016-1875.html vendor advisory
http://www.ubuntu.com/usn/USN-3070-3 vendor advisory
http://www.securitytracker.com/id/1036273 vdb entry
http://www.ubuntu.com/usn/USN-3070-2 vendor advisory
https://github.com/torvalds/linux/commit/11f3710417d026ea2f4fcf362d866342c5274185 issue tracking patch
http://www.openwall.com/lists/oss-security/2016/07/11/8 third party advisory mailing list
http://www.ubuntu.com/usn/USN-3070-4 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2016-6197?
CVE-2016-6197 has been scored as a medium severity vulnerability.
How to fix CVE-2016-6197?
To fix CVE-2016-6197, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-6197 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2016-6197 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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