(RHSA-2021:3445) Important: kernel-rt security and bug fix update

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: out-of-bounds write due to a heap buffer overflow in __hidinput_change_resolution_multipliers() of hid-input.c (CVE-2021-0512)

• kernel: use-after-free in route4_change() in net/sched/cls_route.c (CVE-2021-3715)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

• OSLAT spikes on subset of cpus (BZ#1986064)

• Failure to enter full_nohz due to needless SCHED softirqs (BZ#1990273)

• kernel-rt: update RT source tree to the latest RHEL-8.2.z12 Batch source tree (BZ#1997761)