Bug 1267261 - (CVE-2015-8324) CVE-2015-8324 kernel: Null pointer dereference when mounting ext4
CVE-2015-8324 kernel: Null pointer dereference when mounting ext4
Status: CLOSED ERRATA
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=20151123,reported=2...
: Security
Depends On: 1266862
Blocks: 1267262
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Reported: 2015-09-29 09:31 EDT by Adam Mariš
Modified: 2016-05-11 03:20 EDT (History)
25 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A NULL pointer dereference flaw was found in the way the Linux kernel's ext4 file system driver handled certain corrupted file system images. An attacker with physical access to the system could use this flaw to crash the system.
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Last Closed: 2015-11-24 05:22:42 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Adam Mariš 2015-09-29 09:31:54 EDT
It was reported that there are some exit points in ext4_fill_super which result in destruction of workqueue which is not yet initialized, leading to kernel NULL pointer dereference.

Oops report can be found in product bug:

https://bugzilla.redhat.com/show_bug.cgi?id=1266862

CVE request:

http://seclists.org/oss-sec/2015/q4/357

CVE assignment:

http://seclists.org/oss-sec/2015/q4/360

Upstream fix (only part of the commit is related):

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=744692dc059845b2a3022119871846e74d4f6e11
Comment 3 Vladis Dronov 2015-11-23 04:16:25 EST
Statement:

This problem did not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 7 and MRG-2.
Comment 6 Adam Mariš 2015-12-09 04:27:04 EST
Acknowledgements:

Red Hat would like to thank Dmitriy Monakhov of OpenVZ project for reporting this issue.
Comment 7 errata-xmlrpc 2016-05-10 19:16:47 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2016:0855 https://rhn.redhat.com/errata/RHSA-2016-0855.html

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