Description
The collect_mounts function in fs/namespace.c in the Linux kernel before 4.0.5 does not properly consider that it may execute after a path has been unmounted, 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.
References (7)
Core 7
Core References
Vendor Advisory x_refsource_confirm
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cd4a40174b71acd021877341684d8bb1dc8ea4ae
Mailing List mailing-list
x_refsource_mlist
http://openwall.com/lists/oss-security/2015/05/29/5
Issue Tracking x_refsource_confirm
https://bugzilla.redhat.com/show_bug.cgi?id=1248486
Vendor Advisory x_refsource_confirm
https://github.com/torvalds/linux/commit/cd4a40174b71acd021877341684d8bb1dc8ea4ae
Vendor Advisory x_refsource_confirm
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.5
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
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