CVE-2015-4178

MEDIUM

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.

References

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

http://openwall.com/lists/oss-security/2015/05/29/10

http://openwall.com/lists/oss-security/2015/05/29/5

http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.5

http://www.openwall.com/lists/oss-security/2015/06/04/5

https://bugzilla.redhat.com/show_bug.cgi?id=1249849

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

Details

Source: MITRE

Published: 2016-05-02

Updated: 2016-05-06

Risk Information

CVSS v2.0

Base Score: 4.9

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C

Impact Score: 6.9

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3.0

Base Score: 5.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 1.8

Severity: MEDIUM