Issued:: 2026-06-10
Updated:: 2026-06-10

RHSA-2026:25121 - Critical: kernel security update

Synopsis

Critical: kernel security update

Type/Severity

Security Advisory Critical

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 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: geneve: Fix use-after-free in geneve_find_dev(). (CVE-2025-21858)
kernel: smc: Fix use-after-free in tcp_write_timer_handler() (CVE-2023-53781)
kernel: nbd: defer config unlock in nbd_genl_connect (CVE-2025-68366)
kernel: libceph: prevent potential out-of-bounds reads in handle_auth_done() (CVE-2026-22984)
kernel: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() (CVE-2026-22990)
kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392)
kernel: ALSA: 6fire: fix use-after-free on disconnect (CVE-2026-31581)
kernel: smb: client: fix OOB reads parsing symlink error response (CVE-2026-31613)
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: dlm: validate length in dlm_search_rsb_tree (CVE-2026-43125)
kernel: RDMA/rxe: Fix double free in rxe_srq_from_init (CVE-2026-45852)
kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() (CVE-2026-46181)

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

Product	Version	Arch
Red Hat Enterprise Linux for x86_64	8	x86_64
Red Hat Enterprise Linux for x86_64 - Extended Life Cycle	8.10	x86_64
Red Hat Enterprise Linux for Power, little endian	8	ppc64le
Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle	8.10	ppc64le
Red Hat Enterprise Linux for IBM z Systems	8	s390x
Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle	8.10	s390x
Red Hat Enterprise Linux for ARM 64	8	aarch64
Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle	8.10	aarch64
Red Hat CodeReady Linux Builder for x86_64	8	x86_64
Red Hat CodeReady Linux Builder for Power, little endian	8	ppc64le
Red Hat CodeReady Linux Builder for ARM 64	8	aarch64

Updated Packages

kernel-debug-debuginfo-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-debuginfo-common-s390x-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-headers-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-cross-headers-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-cross-headers-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-tools-4.18.0-553.132.1.el8_10.x86_64.rpm
perf-debuginfo-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-debug-core-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-debuginfo-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-core-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-debug-core-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-debug-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-core-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-tools-debuginfo-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-debug-modules-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-tools-libs-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-modules-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-headers-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-tools-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-tools-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-devel-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-debuginfo-common-ppc64le-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-debug-devel-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-devel-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-zfcpdump-modules-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-modules-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-debug-debuginfo-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-zfcpdump-modules-extra-4.18.0-553.132.1.el8_10.s390x.rpm
perf-4.18.0-553.132.1.el8_10.ppc64le.rpm
perf-debuginfo-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-debuginfo-4.18.0-553.132.1.el8_10.s390x.rpm
bpftool-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-zfcpdump-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-devel-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-debug-debuginfo-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-devel-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-zfcpdump-debuginfo-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-debug-debuginfo-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-tools-libs-devel-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-debug-devel-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-debug-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-debuginfo-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-modules-extra-4.18.0-553.132.1.el8_10.x86_64.rpm
bpftool-debuginfo-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-cross-headers-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-headers-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-tools-debuginfo-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-zfcpdump-core-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-core-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-modules-extra-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-modules-extra-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-debuginfo-common-x86_64-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-headers-4.18.0-553.132.1.el8_10.aarch64.rpm
perf-4.18.0-553.132.1.el8_10.aarch64.rpm
bpftool-4.18.0-553.132.1.el8_10.s390x.rpm
bpftool-4.18.0-553.132.1.el8_10.x86_64.rpm
perf-4.18.0-553.132.1.el8_10.s390x.rpm
python3-perf-debuginfo-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-core-4.18.0-553.132.1.el8_10.s390x.rpm
bpftool-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-4.18.0-553.132.1.el8_10.src.rpm
kernel-debug-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-tools-4.18.0-553.132.1.el8_10.aarch64.rpm
python3-perf-debuginfo-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-debuginfo-common-aarch64-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-tools-debuginfo-4.18.0-553.132.1.el8_10.s390x.rpm
perf-4.18.0-553.132.1.el8_10.x86_64.rpm
python3-perf-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-debuginfo-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-debug-devel-4.18.0-553.132.1.el8_10.ppc64le.rpm
python3-perf-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-tools-libs-devel-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-debug-modules-extra-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-debug-modules-extra-4.18.0-553.132.1.el8_10.x86_64.rpm
python3-perf-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-modules-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-debug-modules-4.18.0-553.132.1.el8_10.ppc64le.rpm
bpftool-debuginfo-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-debug-modules-extra-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-debug-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-debug-core-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-zfcpdump-devel-4.18.0-553.132.1.el8_10.s390x.rpm
perf-debuginfo-4.18.0-553.132.1.el8_10.aarch64.rpm
perf-debuginfo-4.18.0-553.132.1.el8_10.s390x.rpm
python3-perf-debuginfo-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-abi-stablelists-4.18.0-553.132.1.el8_10.noarch.rpm
bpftool-debuginfo-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-debug-modules-extra-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-tools-libs-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-tools-libs-4.18.0-553.132.1.el8_10.x86_64.rpm
python3-perf-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-debug-modules-4.18.0-553.132.1.el8_10.aarch64.rpm
kernel-debug-modules-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-debug-core-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-debug-devel-4.18.0-553.132.1.el8_10.x86_64.rpm
kernel-modules-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-modules-extra-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-cross-headers-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-4.18.0-553.132.1.el8_10.s390x.rpm
kernel-doc-4.18.0-553.132.1.el8_10.noarch.rpm
kernel-tools-debuginfo-4.18.0-553.132.1.el8_10.x86_64.rpm
python3-perf-debuginfo-4.18.0-553.132.1.el8_10.ppc64le.rpm
kernel-tools-libs-devel-4.18.0-553.132.1.el8_10.x86_64.rpm
bpftool-debuginfo-4.18.0-553.132.1.el8_10.x86_64.rpm

Fixes

CVEs

References

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

Additional information

The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at Security Contacts and Procedures.
Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.