RHSA-2026:26563HighCVSS 7.8

Red Hat Security Advisory: kernel security update

Published
June 17, 2026
Last Modified
July 31, 2026

🔗 CVE IDs covered (18)

CVE-2026-43163 →CVE-2026-43190 →CVE-2026-46125 →CVE-2026-22984 →CVE-2026-43110 →CVE-2026-46227 →CVE-2025-68366 →CVE-2025-68800 →CVE-2025-71089 →CVE-2026-22990 →CVE-2026-31685 →CVE-2025-21858 →CVE-2025-68724 →CVE-2025-71116 →CVE-2026-43158 →CVE-2026-46243 →CVE-2026-23392 →CVE-2026-43116 →

📋 Description

CVE-2025-21858 — kernel: geneve: Fix use-after-free in geneve_find_dev(). CVE-2025-68366 — kernel: nbd: defer config unlock in nbd_genl_connect CVE-2025-68724 — kernel: crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id CVE-2025-68800 — kernel: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats CVE-2025-71089 — kernel: iommu: disable SVA when CONFIG_X86 is set CVE-2025-71116 — kernel: libceph: make decode_pool() more resilient against corrupted osdmaps CVE-2026-22984 — kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done() CVE-2026-22990 — kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() CVE-2026-23392 — kernel: netfilter: nf_tables: release flowtable after rcu grace period on error CVE-2026-31685 — kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets CVE-2026-43110 — kernel: wifi: brcmfmac: validate bsscfg indices in IF events CVE-2026-43116 — kernel: netfilter: ctnetlink: ensure safe access to master conntrack CVE-2026-43158 — kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks CVE-2026-43163 — kernel: md/bitmap: fix GPF in write_page caused by resize race CVE-2026-43190 — kernel: netfilter: xt_tcpmss: check remaining length before reading optlen CVE-2026-46125 — kernel: wifi: mac80211: remove station if connection prep fails CVE-2026-46227 — kernel: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL CVE-2026-46243 — kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions

🎯 Affected products74

  • Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8)
  • bpftool-0:4.18.0-477.147.1.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • bpftool-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • bpftool-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8)
  • bpftool-debuginfo-0:4.18.0-477.147.1.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • bpftool-debuginfo-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • bpftool-debuginfo-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8)
  • kernel-0:4.18.0-477.147.1.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-0:4.18.0-477.147.1.el8_8.src as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-0:4.18.0-477.147.1.el8_8.src as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8)
  • kernel-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8)
  • kernel-abi-stablelists-0:4.18.0-477.147.1.el8_8.noarch as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-abi-stablelists-0:4.18.0-477.147.1.el8_8.noarch as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8)
  • kernel-core-0:4.18.0-477.147.1.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-core-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-core-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8)
  • kernel-debug-0:4.18.0-477.147.1.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-debug-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-debug-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8)
  • kernel-debug-core-0:4.18.0-477.147.1.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-debug-core-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-debug-core-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8)
  • kernel-debug-debuginfo-0:4.18.0-477.147.1.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-debug-debuginfo-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-debug-debuginfo-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8)
  • kernel-debug-devel-0:4.18.0-477.147.1.el8_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-debug-devel-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8)
  • kernel-debug-devel-0:4.18.0-477.147.1.el8_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8)
  • +44 more not shown

✅ Remediation

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. Workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Workaround: To mitigate this issue and if Ceph not being used, then prevent module libceph from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Workaround: If Ceph not being used, then possible to disable it. To mitigate this issue, prevent module libceph from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Workaround: To mitigate this issue, prevent module brcmfmac from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Workaround: Mitigation for this issue is to skip loading the affected module "netfilter" onto the system till we have a fix available, this can be done by a blacklist mechanism, this will ensure the driver is not loaded at the boot time. ~~~ How do I blacklist a kernel module to prevent it from loading automatically? https://access.redhat.com/solutions/41278 ~~~ Workaround: To mitigate this issue, prevent module sctp from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Workaround: See the security bulletin for a detailed mitigation procedure.

🔗 References (21)