RHSA-2026:6036 - 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: Linux kernel: Use-After-Free vulnerability in ATM subsystem (CVE-2025-38180)
• kernel: macvlan: fix error recovery in macvlan_common_newlink() (CVE-2026-23209)
• kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204)

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.

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 - 2376376 - CVE-2025-38180 kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem
• BZ - 2439900 - CVE-2026-23209 kernel: macvlan: fix error recovery in macvlan_common_newlink()
• BZ - 2439931 - CVE-2026-23204 kernel: net/sched: cls_u32: use skb_header_pointer_careful()

CVEs

• CVE-2025-38180
• CVE-2026-23204
• CVE-2026-23209

References

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