The Serial Attached SCSI (SAS) implementation in the Linux kernel through 4.15.9 mishandles a mutex within libsas, which allows local users to cause a denial of service (deadlock) by triggering certain error-handling code.
https://www.debian.org/security/2018/dsa-4187
https://usn.ubuntu.com/4163-2/
https://usn.ubuntu.com/4163-1/
https://github.com/torvalds/linux/commit/0558f33c06bb910e2879e355192227a8e8f0219d
https://access.redhat.com/errata/RHSA-2018:3096
https://access.redhat.com/errata/RHSA-2018:3083