The pivot_root implementation in fs/namespace.c in the Linux kernel through 3.17 does not properly interact with certain locations of a chroot directory, which allows local users to cause a denial of service (mount-tree loop) via . (dot) values in both arguments to the pivot_root system call.
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00015.html
http://secunia.com/advisories/60174
http://secunia.com/advisories/61142
http://www.openwall.com/lists/oss-security/2014/10/08/21
http://www.securityfocus.com/bid/70319
http://www.securitytracker.com/id/1030991
http://www.spinics.net/lists/linux-fsdevel/msg79153.html
http://www.ubuntu.com/usn/USN-2419-1
http://www.ubuntu.com/usn/USN-2420-1
http://www.ubuntu.com/usn/USN-2513-1
http://www.ubuntu.com/usn/USN-2514-1
https://access.redhat.com/errata/RHSA-2017:1842
https://access.redhat.com/errata/RHSA-2017:2077
https://bugzilla.redhat.com/show_bug.cgi?id=1151095
Source: MITRE
Published: 2014-10-13
Updated: 2020-08-14
Type: CWE-400
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
Base Score: 5.5
Vector: CVSS:3.1/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