RHSA-2026:7100 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.

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 in BPF sockmap can lead to denial of service and privilege escalation (CVE-2025-38154)
• kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem (CVE-2025-38180)
• kernel: Kernel: Double free vulnerability in exFAT filesystem can lead to denial of service (CVE-2025-38206)
• kernel: Linux kernel:A use-after-free in bridge multicast in br_multicast_port_ctx_init (CVE-2025-38248)
• kernel: macvlan: fix error recovery in macvlan_common_newlink() (CVE-2026-23209)

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 x86_64 - Update Services for SAP Solutions 9.0 x86_64

Fixes

• BZ - 2376056 - CVE-2025-38154 kernel: Linux kernel: Use-after-free in BPF sockmap can lead to denial of service and privilege escalation
• BZ - 2376376 - CVE-2025-38180 kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem
• BZ - 2376377 - CVE-2025-38206 kernel: Kernel: Double free vulnerability in exFAT filesystem can lead to denial of service
• BZ - 2378981 - CVE-2025-38248 kernel: Linux kernel:A use-after-free in bridge multicast in br_multicast_port_ctx_init
• BZ - 2439900 - CVE-2026-23209 kernel: macvlan: fix error recovery in macvlan_common_newlink()

CVEs

• CVE-2025-38154
• CVE-2025-38180
• CVE-2025-38206
• CVE-2025-38248
• CVE-2026-23209

References

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