RHSA-2026:74132 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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: RDMA/siw: Reject MPA FPDU length underflow before signed receive math (CVE-2026-64102)
• kernel: vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets (CVE-2026-68299)
• kernel: net/liquidio: drop cached VF pci_dev LUT (CVE-2026-72329)
• kernel: dm-integrity: don't increment hash_offset twice (CVE-2026-72099)

Bug Fix(es) and Enhancement(s):

• [RHEL 8.10] "kernel BUG at lib/list_debug.c:28!": list_add corruption in register_trace_event RHEL 8.10 (JIRA:RHEL-214136)
• request_key_auth use-after-free on every request-key upcall since 4.18.0-553.165.1 (regression from CVE-2026-63823 backport) (JIRA:RHEL-270349)

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.

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.

Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.

Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.

Affected Products

• Red Hat Enterprise Linux for Real Time 8 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 8 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64

Fixes

• BZ - 2502494 - CVE-2026-64102 kernel: RDMA/siw: Reject MPA FPDU length underflow before signed receive math
• BZ - 2513356 - CVE-2026-68299 kernel: vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets
• BZ - 2516301 - CVE-2026-72329 kernel: net/liquidio: drop cached VF pci_dev LUT
• BZ - 2516445 - CVE-2026-72099 kernel: dm-integrity: don't increment hash_offset twice

CVEs

• CVE-2026-64102
• CVE-2026-68299
• CVE-2026-72099
• CVE-2026-72329

References

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