fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of mounts.
http://www.openwall.com/lists/oss-security/2016/07/13/8
http://www.securityfocus.com/bid/91754
https://access.redhat.com/errata/RHSA-2017:1842
https://access.redhat.com/errata/RHSA-2017:2077
https://bugzilla.redhat.com/show_bug.cgi?id=1356471
https://github.com/torvalds/linux/commit/d29216842a85c7970c536108e093963f02714498
Source: MITRE
Published: 2016-12-28
Updated: 2018-01-05
Type: CWE-400
Base Score: 4.7
Vector: AV:L/AC:M/Au:N/C:N/I:N/A:C
Impact Score: 6.9
Exploitability Score: 3.4
Severity: MEDIUM
Base Score: 4.7
Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 1
Severity: MEDIUM