Red Hat Security Advisory: kernel security and bug fix update

CVE-2020-27777 — kernel: powerpc: RTAS calls can be used to compromise kernel integrity CVE-2021-22555 — kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c CVE-2021-29154 — kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation CVE-2021-29650 — kernel: lack a full memory barrier upon the assignment of a new table value in net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h may lead to DoS CVE-2021-32399 — kernel: race condition for removal of the HCI controller