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Bug 1249849 - (CVE-2015-4178) CVE-2015-4178 kernel: list corruption of m_list or s_list if unused
CVE-2015-4178 kernel: list corruption of m_list or s_list if unused
Status: CLOSED NOTABUG
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=20150701,repor...
: Security
Depends On:
Blocks: 1224245
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Reported: 2015-08-03 20:49 EDT by Wade Mealing
Modified: 2017-01-19 21:00 EST (History)
32 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A flaw was found in the Linux kernel which is related to the user namespace lazily unmounting file systems. The fs_pin struct has two members (m_list and s_list) which are usually initialized on use in the pin_insert_group function. However, these members might go unmodified; in this case, the system panics when it attempts to destroy or free them. This flaw could be used to launch a denial-of-service attack.
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Last Closed: 2017-01-19 21:00:05 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Wade Mealing 2015-08-03 20:49:32 EDT
A flaw was found in the linux kernel related to the user namespace
lazily unmounting filesystems.  The fs_pin struct had two members
(m_list and s_list) which are usually initialized on use in the pin_insert_group function.

It is possible that these lists go unmodified and are then attempted to be 
destroyed/freed panicing the system.

Upstream patch:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=820f9f147dcce2602eefd9b575bbbd9ea14f0953


CVE Request:
http://seclists.org/oss-sec/2015/q2/640
Comment 1 Wade Mealing 2015-08-19 23:53:33 EDT
Statement:

This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 5, 6, 7, MRG-2, realtime and arm-kernels.

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