(RHSA-2023:0854) 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: mm/mremap.c use-after-free vulnerability (CVE-2022-41222)

• kernel: nfsd buffer overflow by RPC message over TCP with garbage data (CVE-2022-43945)

• kernel: an out-of-bounds vulnerability in i2c-ismt driver (CVE-2022-2873)

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):

• RHEL8-RT: Backport use of a dedicate thread for timer wakeups (BZ#2127204)

• SNO Crashed twice - kernel BUG at lib/list_debug.c:28 (BZ#2132062)

• Cannot trigger kernel dump using NMI on SNO node running PAO and RT kernel [RT-8] (BZ#2139851)

• scheduling while atomic in fpu_clone() -> fpu_inherit_perms() (BZ#2154469)

• The latest RHEL 8.7.z2 kernel changes need to be merged into the RT source tree to keep source parity between the two kernels. (BZ#2159806)