CVE-2015-4178 : The fs_pin implementation in the Linux kernel before 4.0.5 does not ensure the i

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.

Published 2016-05-02 10:59:16

Updated 2016-05-06 20:17:27

Source Red Hat, Inc.

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2015-4178

Linux » Linux Kernel
Versions up to, including, (<=) 4.0.4
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2015-4178

EPSS FAQ

0.04%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 6 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2015-4178

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.9	MEDIUM	AV:L/AC:L/Au:N/C:N/I:N/A:C	3.9	6.9	NIST
Access Vector: Local Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete
5.5	MEDIUM	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	1.8	3.6	NIST
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

References for CVE-2015-4178

https://github.com/torvalds/linux/commit/820f9f147dcce2602eefd9b575bbbd9ea14f0953

fs_pin: Allow for the possibility that m_list or s_list go unused. · torvalds/linux@820f9f1 · GitHub
Patch;Vendor Advisory
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.5

Vendor Advisory

CVEs referencing this url
http://openwall.com/lists/oss-security/2015/05/29/5

oss-security - CVE request Linux kernel: ns: user namespaces panic
Patch

CVEs referencing this url
http://www.openwall.com/lists/oss-security/2015/06/04/5

oss-security - Re: Re: CVE request Linux kernel: ns: user namespaces panic

CVEs referencing this url
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=820f9f147dcce2602eefd9b575bbbd9ea14f0953

kernel/git/torvalds/linux.git - Linux kernel source tree
https://bugzilla.redhat.com/show_bug.cgi?id=1249849

1249849 – (CVE-2015-4178) CVE-2015-4178 kernel: list corruption of m_list or s_list if unused
http://openwall.com/lists/oss-security/2015/05/29/10

oss-security - Re: CVE request Linux kernel: ns: user namespaces panic

CVEs referencing this url

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Vulnerability Details : CVE-2015-4178

Products affected by CVE-2015-4178

Exploit prediction scoring system (EPSS) score for CVE-2015-4178

CVSS scores for CVE-2015-4178

References for CVE-2015-4178