RHSA-2026:69874 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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 packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: smc: Fix use-after-free in tcp_write_timer_handler() (CVE-2023-53781)
• kernel: fanotify: fix false positive on permission events (CVE-2026-46150)
• kernel: netfilter: conntrack: remove sprintf usage (CVE-2026-53002)
• kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)
• kernel: scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd() (CVE-2026-63888)
• kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887)
• kernel: sctp: don't free the ASCONF's own transport in DEL-IP processing (CVE-2026-64564)

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 x86_64 - Extended Life Cycle Long Life 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle Long Life 8.4 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle Long Life 8.4 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle Long Life 8.4 s390x

Fixes

• BZ - 2420279 - CVE-2023-53781 kernel: smc: Fix use-after-free in tcp_write_timer_handler()
• BZ - 2482612 - CVE-2026-46150 kernel: fanotify: fix false positive on permission events
• BZ - 2492329 - CVE-2026-53002 kernel: netfilter: conntrack: remove sprintf usage
• BZ - 2492437 - CVE-2026-52993 kernel: tipc: fix double-free in tipc_buf_append()
• BZ - 2502443 - CVE-2026-63888 kernel: scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
• BZ - 2502447 - CVE-2026-63887 kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
• BZ - 2510890 - CVE-2026-64564 kernel: sctp: don't free the ASCONF's own transport in DEL-IP processing

CVEs

• CVE-2023-53781
• CVE-2026-46150
• CVE-2026-52993
• CVE-2026-53002
• CVE-2026-63887
• CVE-2026-63888
• CVE-2026-64564

References

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