RHSA-2026:59737 - 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 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: sctp: purge outqueue on stale COOKIE-ECHO handling (CVE-2026-52924)
• kernel: scsi: target: iscsi: Validate CHAP_R length before base64 decode (CVE-2026-63886)
• kernel: netfilter: conntrack: tcp: do not force CLOSE on invalid-seq RST without direction check (CVE-2026-63913)
• kernel: i2c: stub: Reject I2C block transfers with invalid length (CVE-2026-64191)
• kernel: netfilter: ipset: fix race between dump and ip_set_list resize (CVE-2026-64189)
• kernel: nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page (CVE-2026-64320)
• kernel: Input: synaptics-rmi4 - bound the F3A keymap to the GPIO count (CVE-2026-64277)
• kernel: Input: synaptics-rmi4 - bound the F30 keymap to the GPIO/LED count (CVE-2026-64276)

Bug Fix(es) and Enhancement(s):

• [RHEL-RT] usb_hub_wq items may run on isolated+nohz_full cores (JIRA:RHEL-178088)
• SELinux TCP/MPTCP connect check bypass via TCP Fast Open [rhel-8.10.z] (JIRA:RHEL-222800)
• ss core dumped when there is an SCTP session [rhel-8.10.z] (JIRA:RHEL-212400)

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 - 2492095 - CVE-2026-52924 kernel: sctp: purge outqueue on stale COOKIE-ECHO handling
• BZ - 2502329 - CVE-2026-63886 kernel: scsi: target: iscsi: Validate CHAP_R length before base64 decode
• BZ - 2502438 - CVE-2026-63913 kernel: netfilter: conntrack: tcp: do not force CLOSE on invalid-seq RST without direction check
• BZ - 2502872 - CVE-2026-64191 kernel: i2c: stub: Reject I2C block transfers with invalid length
• BZ - 2502889 - CVE-2026-64189 kernel: netfilter: ipset: fix race between dump and ip_set_list resize
• BZ - 2507061 - CVE-2026-64320 kernel: nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
• BZ - 2507290 - CVE-2026-64277 kernel: Input: synaptics-rmi4 - bound the F3A keymap to the GPIO count
• BZ - 2507301 - CVE-2026-64276 kernel: Input: synaptics-rmi4 - bound the F30 keymap to the GPIO/LED count

CVEs

• CVE-2026-52924
• CVE-2026-63886
• CVE-2026-63913
• CVE-2026-64189
• CVE-2026-64191
• CVE-2026-64276
• CVE-2026-64277
• CVE-2026-64320

References

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