An issue was discovered in the Linux kernel through 4.18.8. The vmacache_flush_all function in mm/vmacache.c mishandles sequence number overflows. An attacker can trigger a use-after-free (and possibly gain privileges) via certain thread creation, map, unmap, invalidation, and dereference operations.
http://www.securityfocus.com/bid/105417
http://www.securityfocus.com/bid/106503
http://www.securitytracker.com/id/1041748
https://access.redhat.com/errata/RHSA-2018:3656
https://github.com/torvalds/linux/commit/7a9cdebdcc17e426fb5287e4a82db1dfe86339b2
https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
https://security.netapp.com/advisory/ntap-20190204-0001/
https://usn.ubuntu.com/3776-1/
https://usn.ubuntu.com/3776-2/
https://usn.ubuntu.com/3777-1/
https://usn.ubuntu.com/3777-2/
https://usn.ubuntu.com/3777-3/
https://www.debian.org/security/2018/dsa-4308
Source: MITRE
Published: 2018-09-19
Updated: 2019-03-05
Type: CWE-416
Base Score: 7.2
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 3.9
Severity: HIGH
Base Score: 7.8
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.8
Severity: HIGH