RHSA-2026:26535: Critical: kernel security, bug fix, and enhancement update

Published Jun 17, 2026
·
Updated

Critical: kernel security, bug fix, and enhancement update

Other sources

The kernel packages contain the Linux kernel, the core of any Linux operating system.Security Fix(es): kernel: geneve: Fix use-after-free in genevefinddev(). (CVE-2025-21858) kernel: sctp: fix a potential overflow in sctpifwdtsnskip (CVE-2023-53372) kernel: net: use dstdevrcu() in sksetupcaps() (CVE-2025-40170) kernel: ipv6: use RCU in ip6xmit() (CVE-2025-40135) kernel: ipv6: use RCU in ip6output() (CVE-2025-40158) kernel: nbd: defer config unlock in nbdgenlconnect (CVE-2025-68366) kernel: mlxsw: spectrummr: Fix use-after-free when updating multicast route stats (CVE-2025-68800) kernel: iommu: disable SVA when CONFIGX86 is set (CVE-2025-71089) kernel: macvlan: fix possible UAF in macvlanforwardsource() (CVE-2026-23001) kernel: Linux kernel: Denial of Service due to a deadlock in hugetlb folio migration (CVE-2026-23097) kernel: ALSA: aloop: Fix racy access at PCM trigger (CVE-2026-23191) kernel: scsi: target: iscsi: Fix use-after-free in iscsitdecconnusagecount() (CVE-2026-23216) kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243) kernel: netfilter: nftables: release flowtable after rcu grace period on error (CVE-2026-23392) kernel: netfilter: ip6teui64: reject invalid MAC header for all packets (CVE-2026-31685) kernel: ip6tunnel: clear skb2->cb[] in ip4ip6err() (CVE-2026-43037) kernel: ipv6: icmp: clear skb2->cb[] in ip6errgenicmpv6unreach() (CVE-2026-43038) kernel: netfilter: ctnetlink: ensure safe access to master conntrack (CVE-2026-43116) kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110) kernel: md/bitmap: fix GPF in writepage caused by resize race (CVE-2026-43163) kernel: netfilter: xttcpmss: check remaining length before reading optlen (CVE-2026-43190) kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158) kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243) kernel: sctp: revalidate list cursor after sctpsendmsgtoasoc() in SCTPSENDALL (CVE-2026-46227) Bug Fix(es) and Enhancement(s): NFS client hangs while returning delegations (JIRA:RHEL-112276) Rhel backport of upstream commit "i40e: avoid redundant VF link state update" (JIRA:RHEL-141908) 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.

— Red Hat

Affected Software

28 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Update Support Extension
Red Hat Red Hat Enterprise Linux Server - AUS
redhat/kernel<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/bpftool<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/bpftool-debuginfo<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-abi-stablelists<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-core<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-cross-headers<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-debug<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-debug-core<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-debug-debuginfo<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-debug-devel<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-debug-modules<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-debug-modules-extra<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-debuginfo<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-devel<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-doc<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-headers<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-modules<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-modules-extra<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-tools<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-tools-debuginfo<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/kernel-tools-libs<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/perf<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/perf-debuginfo<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/python3-perf<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4
redhat/python3-perf-debuginfo<4.18.0-305.194.1.el8_4
4.18.0-305.194.1.el8_4

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  2. Upgrade

    Upgrade redhat/bpftool to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  3. Upgrade

    Upgrade redhat/bpftool-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  4. Upgrade

    Upgrade redhat/kernel-abi-stablelists to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  5. Upgrade

    Upgrade redhat/kernel-core to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  6. Upgrade

    Upgrade redhat/kernel-cross-headers to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  7. Upgrade

    Upgrade redhat/kernel-debug to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  8. Upgrade

    Upgrade redhat/kernel-debug-core to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  9. Upgrade

    Upgrade redhat/kernel-debug-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  10. Upgrade

    Upgrade redhat/kernel-debug-devel to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  11. Upgrade

    Upgrade redhat/kernel-debug-modules to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  12. Upgrade

    Upgrade redhat/kernel-debug-modules-extra to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  13. Upgrade

    Upgrade redhat/kernel-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  14. Upgrade

    Upgrade redhat/kernel-devel to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  15. Upgrade

    Upgrade redhat/kernel-doc to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  16. Upgrade

    Upgrade redhat/kernel-headers to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  17. Upgrade

    Upgrade redhat/kernel-modules to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  18. Upgrade

    Upgrade redhat/kernel-modules-extra to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  19. Upgrade

    Upgrade redhat/kernel-tools to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  20. Upgrade

    Upgrade redhat/kernel-tools-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  21. Upgrade

    Upgrade redhat/kernel-tools-libs to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  22. Upgrade

    Upgrade redhat/perf to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  23. Upgrade

    Upgrade redhat/perf-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  24. Upgrade

    Upgrade redhat/python3-perf to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  25. Upgrade

    Upgrade redhat/python3-perf-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-305.194.1.el8_4
  26. Operational

    Reboot the system for the kernel update to take effect.

Event History

Jun 17, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·08:37 AM
Data Sourced
via Red Hat·08:37 AM
Severity
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Frequently Asked Questions

1

What is the severity of RHSA-2026:26535?

The severity of RHSA-2026:26535 is critical with a CVSS score of 9.

2

What vulnerabilities are addressed in RHSA-2026:26535?

RHSA-2026:26535 addresses a critical security fix for kernel vulnerabilities, including a use-after-free issue in geneve_find_dev() and potential overflow in sctp_ifwdtsn_skip.

3

How do I fix RHSA-2026:26535?

To fix RHSA-2026:26535, users should update their kernel packages to the latest version provided by Red Hat.

4

Which software packages are impacted by RHSA-2026:26535?

The impacted software packages include the kernel packages for Red Hat Enterprise Linux and related utilities like bpftool.

5

When was RHSA-2026:26535 published?

RHSA-2026:26535 was published on June 17, 2026.

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