(RHSA-2022:8974) 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: KVM: cmpxchg_gpte can write to pfns outside the userspace region (CVE-2022-1158)

• kernel: openvswitch: integer underflow leads to out-of-bounds write in reserve_sfa_size() (CVE-2022-2639)

• kernel: watch queue race condition can lead to privilege escalation (CVE-2022-2959)

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

• hw: cpu: incomplete clean-up of multi-core shared buffers (aka SBDR) (CVE-2022-21123)

• hw: cpu: incomplete clean-up of microarchitectural fill buffers (aka SBDS) (CVE-2022-21125)

• hw: cpu: incomplete clean-up in specific special register write operations (aka DRPW) (CVE-2022-21166)

• hw: cpu: AMD: RetBleed Arbitrary Speculative Code Execution with Return Instructions (CVE-2022-23816, CVE-2022-29900)

• hw: cpu: AMD: Branch Type Confusion (non-retbleed) (CVE-2022-23825)

• hw: cpu: Intel: Post-barrier Return Stack Buffer Predictions (CVE-2022-26373)

• hw: cpu: Intel: RetBleed Arbitrary Speculative Code Execution with Return Instructions (CVE-2022-29901)

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):

• kernel-rt: update RT source tree to the latest RHEL-9.0.z5 Batch (BZ#2137580)

• [DELL EMC 9.0-RT BUG] System is not booting into RT Kernel with perc12 [kernel-rt] (BZ#2139864)