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Bug 1360968 - (CVE-2015-8952) CVE-2015-8952 kernel: mbcache code subject to softlockup DOS in cache management
CVE-2015-8952 kernel: mbcache code subject to softlockup DOS in cache management
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20160822,reported=2...
: Security
Depends On: 1368919
Blocks: 1352636
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Reported: 2016-07-28 01:10 EDT by Wade Mealing
Modified: 2018-08-28 18:07 EDT (History)
20 users (show)

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A design flaw was found in the file extended attribute handling of the Linux kernel's handling of cached attributes. Too many entries in the cache cause a soft lockup while attempting to iterate the cache and access relevant locks.
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Description Wade Mealing 2016-07-28 01:10:20 EDT 
A design flaw was found in the file extended attribute handling of the linux kernels handling of cached attributes.  Too many entries in the cache cause a soft lockup while attempting to iterate the cache and access relevant locks.

Upstream has replaced the mbcache code with an updated version which was not a patch but a clear-cut reimplentation of the code.

Upstream discussion:
https://lwn.net/Articles/668718/

Bugzilla kernel submission:
https://bugzilla.kernel.org/show_bug.cgi?id=107301

Probable fix:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=be0726d33cb8f411945884664924bed3cb8c70ee
Comment 2 Wade Mealing 2016-07-28 02:27:34 EDT 
Acknowledgements:

Red Hat would like to thank Laurent Guerby for bringing this to our attention.
Comment 3 Wade Mealing 2016-08-17 23:09:32 EDT 
Statement:

This issue does not affect any shiping version of Red Hat Enterprise Linux.
Comment 4 Prasad J Pandit 2016-08-22 02:35:33 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1368919]
Comment 6 Andrej Nemec 2016-08-26 04:00:13 EDT 
CVE assignment:

http://seclists.org/oss-sec/2016/q3/378
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