RHSA-2026:2378 - 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: vsock/vmci: Clear the vmci transport packet properly when initializing it (CVE-2025-38403)
• kernel: net: use dst_dev_rcu() in sk_setup_caps() (CVE-2025-40170)
• kernel: ipv6: use RCU in ip6_xmit() (CVE-2025-40135)
• kernel: ipv6: use RCU in ip6_output() (CVE-2025-40158)
• kernel: Linux kernel ALSA USB audio driver: Buffer overflow leading to information disclosure and denial of service (CVE-2025-40269)
• kernel: ext4: fix use-after-free in ext4_orphan_cleanup (CVE-2022-50673)
• kernel: NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid (CVE-2025-68349)
• kernel: nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec (CVE-2026-22998)

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 - 2383421 - CVE-2025-38403 kernel: vsock/vmci: Clear the vmci transport packet properly when initializing it
• BZ - 2414506 - CVE-2025-40170 kernel: net: use dst_dev_rcu() in sk_setup_caps()
• BZ - 2414521 - CVE-2025-40135 kernel: ipv6: use RCU in ip6_xmit()
• BZ - 2414523 - CVE-2025-40158 kernel: ipv6: use RCU in ip6_output()
• BZ - 2419919 - CVE-2025-40269 kernel: Linux kernel ALSA USB audio driver: Buffer overflow leading to information disclosure and denial of service
• BZ - 2420347 - CVE-2022-50673 kernel: ext4: fix use-after-free in ext4_orphan_cleanup
• BZ - 2424880 - CVE-2025-68349 kernel: NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid
• BZ - 2432671 - CVE-2026-22998 kernel: nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec

CVEs

• CVE-2022-50673
• CVE-2025-38403
• CVE-2025-40135
• CVE-2025-40158
• CVE-2025-40170
• CVE-2025-40269
• CVE-2025-68349
• CVE-2026-22998

References

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