Important: kernel-rt security and bug fix update

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Affected Products

• Red Hat Enterprise Linux for Real Time 9 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 9 x86_64

Fixes

• BZ - 2151317 - CVE-2022-45869 kernel: KVM: x86/mmu: race condition in direct_page_fault()
• BZ - 2187257 - CVE-2023-1998 kernel: Spectre v2 SMT mitigations problem
• BZ - 2193219 - CVE-2023-0458 kernel: speculative pointer dereference in do_prlimit() in kernel/sys.c
• BZ - 2215768 - CVE-2023-35788 kernel: cls_flower: out-of-bounds write in fl_set_geneve_opt()
• BZ - 2218672 - CVE-2023-3090 kernel: ipvlan: out-of-bounds write caused by unclear skb->cb

CVEs

• CVE-2022-45869
• CVE-2023-0458
• CVE-2023-1998
• CVE-2023-3090
• CVE-2023-35788

References

• https://access.redhat.com/security/updates/classification/#important