(RHSA-2023:4378) 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: ipvlan: out-of-bounds write caused by unclear skb->cb (CVE-2023-3090)

• kernel: cls_flower: out-of-bounds write in fl_set_geneve_opt() (CVE-2023-35788)

• kernel: KVM: x86/mmu: race condition in direct_page_fault() (CVE-2022-45869)

• kernel: speculative pointer dereference in do_prlimit() in kernel/sys.c (CVE-2023-0458)

• kernel: Spectre v2 SMT mitigations problem (CVE-2023-1998)

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):

• RHEL9 rt: blktests block/024 failed (BZ#2209920)

• Backport pinned timers RT specific behavior for FIFO tasks (BZ#2210071)

• kernel-rt: update RT source tree to the RHEL-9.2z2 source tree (BZ#2215122)

• kernel-rt: update RT source tree to the RHEL-9.2z2b source tree (BZ#2222796)