RHSA-2026:59821 — Security Advisory

Red Hat Security Advisory: kernel security, bug fix, and enhancement update

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Severity

Important

Red Hat Product Security

RHEL 8

Products

Official CSAF product identity

Published · August 26, 2026

Updated · November 4, 2026

Topic

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

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):

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

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.