Bug 1249849 (CVE-2015-4178) - CVE-2015-4178 kernel: list corruption of m_list or s_list if unused
Summary: CVE-2015-4178 kernel: list corruption of m_list or s_list if unused
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2015-4178
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1224245
TreeView+ depends on / blocked
 
Reported: 2015-08-04 00:49 UTC by Wade Mealing
Modified: 2019-09-29 13:35 UTC (History)
32 users (show)

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.
Clone Of:
Environment:
Last Closed: 2017-01-20 02:00:05 UTC


Attachments (Terms of Use)

Description Wade Mealing 2015-08-04 00:49:32 UTC
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 2015-08-20 03:53:33 UTC
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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