Vulnerability CVE-2015-4178
Published: 2016-05-02

Description:
The fs_pin implementation in the Linux kernel before 4.0.5 does not ensure the internal consistency of a certain list data structure, which allows local users to cause a denial of service (system crash) by leveraging user-namespace root access for an MNT_DETACH umount2 system call, related to fs/fs_pin.c and include/linux/fs_pin.h.

CVSS2 => (AV:L/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.9/10
6.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Linux -> Linux kernel 

 References:
https://github.com/torvalds/linux/commit/820f9f147dcce2602eefd9b575bbbd9ea14f0953
http://openwall.com/lists/oss-security/2015/05/29/5
https://bugzilla.redhat.com/show_bug.cgi?id=1249849
http://www.openwall.com/lists/oss-security/2015/06/04/5
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.5
http://openwall.com/lists/oss-security/2015/05/29/10
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=820f9f147dcce2602eefd9b575bbbd9ea14f0953
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