oss-security - Re: CVE request: Linux kernel mbcache lock contention denial of service.

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Date: Thu, 25 Aug 2016 13:50:49 -0400 (EDT)
From: cve-assign@...re.org
To: wmealing@...hat.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: CVE request: Linux kernel mbcache lock contention denial of service.

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> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=be0726d33cb8f411945884664924bed3cb8c70ee
> https://lwn.net/Articles/668718/
> https://bugzilla.kernel.org/show_bug.cgi?id=107301
> https://bugzilla.redhat.com/show_bug.cgi?id=1360968
> 
> 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 reimplementation of the code, no
> single diff
> 
> Soft lockup information is in both the bugzilla.kernel.org and
> referred to in the LWN article. This would affect containers running
> with ext4 as it shares the same mbcache between all containers/host.
> 
> This did not affect Red Hat Enterprise Linux versions 5,6 or 7, so I
> can't validate the claim that it does affect other newer kernels.
> This may be worthwhile tracking for others who are affected by this
> flaw.
> 
> For those following along at home, this seemed to be fixed in:
> 
> git tag --contains be0726d33cb8f411945884664924bed3cb8c70ee
> v4.6

Use CVE-2015-8952.

- -- 
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
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  http://cve.mitre.org/cve/request_id.html ]
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