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Bug 1367814 - (CVE-2015-8953) CVE-2015-8953 kernel: overlayfs: Double dentry reference leak in copy-up failure
CVE-2015-8953 kernel: overlayfs: Double dentry reference leak in copy-up failure
Status: CLOSED WONTFIX
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20160823,repor...
: Security
Depends On: 1370467
Blocks: 1367816
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Reported: 2016-08-17 10:29 EDT by Adam Mariš
Modified: 2016-11-04 14:43 EDT (History)
25 users (show)

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Doc Text:
A flaw was found in the Linux kernel's implementation of overlayfs. An attacker can leak file resources in the system by opening a large file with write permissions on a overlay filesystem that is insufficient to deal with the size of the write. When unmounting the underlying device, the system is unable to free an inode and this will consume resources. Repeating this for all available inodes and memory will create a denial of service situation.
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Last Closed: 2016-11-04 14:43:44 EDT
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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Description Adam Mariš 2016-08-17 10:29:28 EDT 
A flaw was found in the Linux kernels implementation of overlayfs.  An attacker can leak a file resources in the system by opening a large file with write permissions on a overlay filesystem that is insufficient to deal with the size of the write.

When unmounting the underlying device, the system is unable to free an inode and this will consume resources.  Repeating this for all available inodes and memory will create a denial of service situation.

Product bug:

https://bugzilla.redhat.com/show_bug.cgi?id=1261073

Upstream patch:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ab79efab0a0ba01a74df782eb7fa44b044dae8b5
Comment 2 Andrej Nemec 2016-08-26 04:19:16 EDT 
CVE assignment:

http://seclists.org/oss-sec/2016/q3/377
Comment 3 Andrej Nemec 2016-08-26 08:22:27 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1370467]
Comment 4 Wade Mealing 2016-10-03 22:49:32 EDT 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 as the code with the flaw is not present in the products listed.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux  7 and MRG-2. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
Comment 5 Wade Mealing 2016-10-03 22:53:40 EDT 
Acknowledgements:

Name: CAI Qian (Red Hat Engineering)
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