RHSA-2026:25533 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On and Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support.

Red Hat Product Security has rated this update as having a security impact of Critical. 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: nvme: avoid double free special payload (CVE-2024-41073)
• kernel: sctp: fix a potential overflow in sctp_ifwdtsn_skip (CVE-2023-53372)
• 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: nbd: defer config unlock in nbd_genl_connect (CVE-2025-68366)
• 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: macvlan: fix possible UAF in macvlan_forward_source() (CVE-2026-23001)
• kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count() (CVE-2026-23216)
• kernel: can: raw: fix ro->uniq use-after-free in raw_rcv() (CVE-2026-31532)
• 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: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110)
• kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)

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 x86_64 - Extended Update Support Extension 8.6 x86_64
• Red Hat Enterprise Linux Server - AUS 8.6 x86_64

Fixes

• BZ - 2301637 - CVE-2024-41073 kernel: nvme: avoid double free special payload
• BZ - 2396405 - CVE-2023-53372 kernel: sctp: fix a potential overflow in sctp_ifwdtsn_skip
• 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 - 2424881 - CVE-2025-68366 kernel: nbd: defer config unlock in nbd_genl_connect
• BZ - 2424886 - CVE-2025-68724 kernel: crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id
• BZ - 2429104 - CVE-2025-71089 kernel: iommu: disable SVA when CONFIG_X86 is set
• BZ - 2432664 - CVE-2026-23001 kernel: macvlan: fix possible UAF in macvlan_forward_source()
• BZ - 2440630 - CVE-2026-23216 kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count()
• BZ - 2461107 - CVE-2026-31532 kernel: can: raw: fix ro->uniq use-after-free in raw_rcv()
• BZ - 2461759 - CVE-2026-31685 kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets
• BZ - 2464351 - CVE-2026-43037 kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
• BZ - 2464397 - CVE-2026-43038 kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()
• BZ - 2467014 - CVE-2026-43110 kernel: wifi: brcmfmac: validate bsscfg indices in IF events
• BZ - 2467064 - CVE-2026-43190 kernel: netfilter: xt_tcpmss: check remaining length before reading optlen

CVEs

• CVE-2023-53372
• CVE-2024-41073
• CVE-2025-40135
• CVE-2025-40158
• CVE-2025-40170
• CVE-2025-68366
• CVE-2025-68724
• CVE-2025-71089
• CVE-2026-23001
• CVE-2026-23216
• CVE-2026-31532
• CVE-2026-31685
• CVE-2026-43037
• CVE-2026-43038
• CVE-2026-43110
• CVE-2026-43190

References

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