Bug 1355654 (CVE-2016-6198) - CVE-2016-6198 kernel: vfs: missing detection of hardlinks in vfs_rename() on overlayfs
Summary: CVE-2016-6198 kernel: vfs: missing detection of hardlinks in vfs_rename() on ...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-6198
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: Red Hat1258556 Red Hat1341795 1355655
Blocks: Embargoed1355693
TreeView+ depends on / blocked
 
Reported: 2016-07-12 07:30 UTC by Martin Prpič
Modified: 2021-10-21 00:54 UTC (History)
27 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found that the vfs_rename() function did not detect hard links on overlayfs. A local, unprivileged user could use the rename syscall on overlayfs on top of xfs to crash the system.
Clone Of:
Environment:
Last Closed: 2021-10-21 00:54:18 UTC

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2016:2574 0 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2016-11-03 12:06:10 UTC
Red Hat Product Errata RHSA-2016:2584 0 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2016-11-03 12:08:49 UTC

Description Martin Prpič 2016-07-12 07:30:51 UTC 
It was found that the vfs_rename() function did not detect hard links on overlayfs. A local, unprivileged user could use the rename syscall on overlayfs on top of xfs to crash the system.

Upstream patches:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54d5ca871e72f2bb172ec9323497f01cd5091ec7
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9409e22acdfc9153f88d9b1ed2bd2a5b34d2d3ca

CVE assignment:

http://seclists.org/oss-sec/2016/q3/42
Comment 1 Martin Prpič 2016-07-12 07:31:30 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1355655]
Comment 2 Martin Prpič 2016-07-12 14:01:30 UTC 
Acknowledgments:

Name: CAI Qian (Red Hat)
Comment 3 Wade Mealing 2016-07-22 07:14:27 UTC 
Statement: 

This issue is not present in the Linux kernel packages as shipped with Red Hat Enterprise Linux versions 5 and 6.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. Future Linux kernel updates for the respective releases may address this issue.
Comment 8 errata-xmlrpc 2016-11-03 17:07:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html
Comment 9 errata-xmlrpc 2016-11-03 19:55:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2584 https://rhn.redhat.com/errata/RHSA-2016-2584.html
Comment 10 errata-xmlrpc 2016-11-03 21:37:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html
Comment 11 errata-xmlrpc 2016-11-03 21:44:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2584 https://rhn.redhat.com/errata/RHSA-2016-2584.html
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