Red Hat Security Advisory: kernel security update

CVE-2021-0920 — kernel: Use After Free in unix_gc() which could result in a local privilege escalation CVE-2021-4083 — kernel: fget: check that the fd still exists after getting a ref to it CVE-2022-0330 — kernel: possible privileges escalation due to missing TLB flush CVE-2022-22942 — kernel: failing usercopy allows for use-after-free exploitation