The do_get_mempolicy function in mm/mempolicy.c in the Linux kernel before 4.12.9 allows local users to cause a denial of service (use-after-free) or possibly have unspecified other impact via crafted system calls.
https://www.oracle.com/security-alerts/cpujul2020.html
https://usn.ubuntu.com/3754-1/
https://access.redhat.com/errata/RHSA-2018:3590
https://access.redhat.com/errata/RHSA-2018:3586
https://access.redhat.com/errata/RHSA-2018:3540
https://access.redhat.com/errata/RHSA-2018:2933
https://access.redhat.com/errata/RHSA-2018:2925
https://access.redhat.com/errata/RHSA-2018:2924
https://access.redhat.com/errata/RHSA-2018:2791
https://access.redhat.com/errata/RHSA-2018:2785
https://access.redhat.com/errata/RHSA-2018:2395
https://access.redhat.com/errata/RHSA-2018:2384