RHSA-2026:23237 — Security Advisory

Red Hat Security Advisory: kernel security update

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Severity

Important

Red Hat Product Security

RHEL 9

Products

Official CSAF product identity

Published · June 4, 2026

Updated · November 4, 2026

Topic

An update for kernel is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.

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: 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: crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id (CVE-2025-68724)
kernel: iommu: disable SVA when CONFIG_X86 is set (CVE-2025-71089)
kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count() (CVE-2026-23216)
kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392)
kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685)
kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (CVE-2026-43037)
kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() (CVE-2026-43038)
kernel: smb: client: validate the whole DACL before rewriting it in cifsacl (CVE-2026-31709)
kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110)

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.