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 (7)
Core 7
Core References
Patch mailing-list
x_refsource_mlist
http://openwall.com/lists/oss-security/2015/05/29/5
Vendor Advisory x_refsource_confirm
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.5
Issue Tracking x_refsource_confirm
https://bugzilla.redhat.com/show_bug.cgi?id=1249849
Mailing List mailing-list
x_refsource_mlist
http://openwall.com/lists/oss-security/2015/05/29/10
Mailing List mailing-list
x_refsource_mlist
http://www.openwall.com/lists/oss-security/2015/06/04/5
Patch, Vendor Advisory x_refsource_confirm
https://github.com/torvalds/linux/commit/820f9f147dcce2602eefd9b575bbbd9ea14f0953
Scores
CVSS v3
5.5
EPSS
0.0004
EPSS Percentile
12.7%
Attack Vector
LOCAL
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details
Status
published
Products (1)
linux/linux_kernel
< 4.0.4
Published
May 02, 2016
Tracked Since
Feb 18, 2026