Issued:: 2026-05-28
Updated:: 2026-05-28

RHSA-2026:21557 - Important: kernel security update

Synopsis

Important: kernel security update

Type/Severity

Security Advisory Important

Topic

An update for kernel is now available for Red Hat Enterprise Linux 10.

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: can: j1939: j1939_session_new(): fix skb reference counting (CVE-2024-56645)
kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)
kernel: mm: thp: deny THP for files on anonymous inodes (CVE-2026-23375)
kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392)
kernel: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() (CVE-2026-23455)
kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684)
kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685)
kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027)
kernel: io_uring/rsrc: reject zero-length fixed buffer import (CVE-2026-43006)
kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020)
kernel: HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq (CVE-2026-43051)
kernel: Bluetooth: SCO: fix race conditions in sco_sock_connect() (CVE-2026-43023)
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: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)
kernel: Linux kernel dpaa2-switch: Kernel memory corruption via out-of-bounds write (CVE-2026-43205)
kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)
kernel: mm/page_alloc: clear page->private in free_pages_prepare() (CVE-2026-43303)

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	10	x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support	10.2	x86_64
Red Hat Enterprise Linux for x86_64 - Extended Life Cycle	10.2	x86_64
Red Hat Enterprise Linux for x86_64 - 4 years of updates	10.2	x86_64
Red Hat Enterprise Linux for Power, little endian	10	ppc64le
Red Hat Enterprise Linux for Power, little endian - Extended Update Support	10.2	ppc64le
Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle	10.2	ppc64le
Red Hat Enterprise Linux for Power, little endian - 4 years of support	10.2	ppc64le
Red Hat Enterprise Linux for IBM z Systems	10	s390x
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support	10.2	s390x
Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle	10.2	s390x
Red Hat Enterprise Linux for IBM z Systems - 4 years of updates	10.2	s390x
Red Hat Enterprise Linux for ARM 64	10	aarch64
Red Hat Enterprise Linux for ARM 64 - Extended Update Support	10.2	aarch64
Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle	10.2	aarch64
Red Hat Enterprise Linux for ARM 64 - 4 years of updates	10.2	aarch64
Red Hat CodeReady Linux Builder for x86_64	10	x86_64
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support	10.2	x86_64
Red Hat CodeReady Linux Builder for Power, little endian	10	ppc64le
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support	10.2	ppc64le
Red Hat CodeReady Linux Builder for IBM z Systems	10	s390x
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support	10.2	s390x
Red Hat CodeReady Linux Builder for ARM 64	10	aarch64
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support	10.2	aarch64

Updated Packages

kernel-debuginfo-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-64k-modules-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-headers-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-modules-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-modules-extra-matched-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-debuginfo-common-aarch64-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-devel-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-devel-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-64k-debuginfo-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-devel-matched-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-debug-devel-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-debug-modules-core-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-rt-64k-devel-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-tools-libs-6.12.0-211.18.1.el10_2.aarch64.rpm
python3-perf-6.12.0-211.18.1.el10_2.ppc64le.rpm
python3-perf-debuginfo-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-64k-modules-extra-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-debug-modules-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debuginfo-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-rt-debug-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-64k-debug-modules-extra-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-modules-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-debug-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-debug-devel-matched-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-modules-extra-matched-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-64k-debug-modules-extra-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-64k-modules-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-debug-devel-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-rt-debug-modules-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-modules-extra-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-modules-extra-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-tools-libs-devel-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-debug-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-modules-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-debug-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-uki-virt-addons-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-6.12.0-211.18.1.el10_2.src.rpm
kernel-cross-headers-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-zfcpdump-debuginfo-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-headers-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-zfcpdump-modules-core-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-64k-devel-matched-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-debuginfo-6.12.0-211.18.1.el10_2.s390x.rpm
perf-debuginfo-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-cross-headers-6.12.0-211.18.1.el10_2.x86_64.rpm
rtla-6.12.0-211.18.1.el10_2.x86_64.rpm
python3-perf-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-64k-debug-debuginfo-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-core-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-modules-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-rt-64k-debug-devel-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-debug-modules-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-rt-modules-core-6.12.0-211.18.1.el10_2.x86_64.rpm
perf-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-debug-modules-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-64k-debuginfo-6.12.0-211.18.1.el10_2.aarch64.rpm
libperf-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-debug-devel-6.12.0-211.18.1.el10_2.x86_64.rpm
perf-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-64k-debug-6.12.0-211.18.1.el10_2.aarch64.rpm
perf-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-rt-6.12.0-211.18.1.el10_2.aarch64.rpm
perf-debuginfo-6.12.0-211.18.1.el10_2.aarch64.rpm
python3-perf-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-tools-libs-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-64k-debug-devel-matched-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-devel-matched-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-doc-6.12.0-211.18.1.el10_2.noarch.rpm
kernel-rt-64k-debug-modules-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-tools-debuginfo-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-tools-libs-devel-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-debug-debuginfo-6.12.0-211.18.1.el10_2.ppc64le.rpm
libperf-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-headers-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-64k-debug-debuginfo-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-modules-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-debug-debuginfo-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-64k-debug-modules-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-debug-debuginfo-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-modules-extra-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-64k-modules-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-modules-core-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-devel-matched-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-tools-libs-6.12.0-211.18.1.el10_2.ppc64le.rpm
libperf-debuginfo-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-tools-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-64k-devel-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-64k-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-tools-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-64k-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-64k-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-debug-modules-extra-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-modules-core-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-devel-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-cross-headers-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-modules-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-rt-64k-debug-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-core-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-rt-debug-modules-extra-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-rt-debug-core-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-rt-modules-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-devel-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-tools-libs-devel-6.12.0-211.18.1.el10_2.aarch64.rpm
perf-debuginfo-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-tools-debuginfo-6.12.0-211.18.1.el10_2.ppc64le.rpm
rv-6.12.0-211.18.1.el10_2.aarch64.rpm
perf-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-core-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-rt-64k-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-zfcpdump-devel-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-64k-debug-devel-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-headers-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-rt-debug-modules-extra-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-debug-core-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-modules-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-zfcpdump-core-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-modules-extra-6.12.0-211.18.1.el10_2.s390x.rpm
rv-6.12.0-211.18.1.el10_2.x86_64.rpm
libperf-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-debug-devel-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-devel-matched-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-rt-debug-debuginfo-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-abi-stablelists-6.12.0-211.18.1.el10_2.noarch.rpm
kernel-rt-64k-modules-extra-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-tools-6.12.0-211.18.1.el10_2.s390x.rpm
rv-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-rt-64k-debug-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-devel-matched-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-rt-debuginfo-6.12.0-211.18.1.el10_2.aarch64.rpm
python3-perf-6.12.0-211.18.1.el10_2.x86_64.rpm
python3-perf-debuginfo-6.12.0-211.18.1.el10_2.aarch64.rpm
rtla-6.12.0-211.18.1.el10_2.aarch64.rpm
rv-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-devel-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-rt-debuginfo-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-modules-core-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-debuginfo-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-debug-core-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-debug-modules-extra-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-cross-headers-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-debuginfo-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-modules-extra-matched-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-uki-virt-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-zfcpdump-modules-extra-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-rt-debug-debuginfo-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-rt-devel-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-zfcpdump-devel-matched-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-rt-modules-6.12.0-211.18.1.el10_2.aarch64.rpm
python3-perf-debuginfo-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-tools-debuginfo-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-debug-modules-core-6.12.0-211.18.1.el10_2.s390x.rpm
rtla-6.12.0-211.18.1.el10_2.ppc64le.rpm
rtla-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-modules-extra-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-modules-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-tools-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-devel-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-rt-modules-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-tools-debuginfo-6.12.0-211.18.1.el10_2.s390x.rpm
python3-perf-debuginfo-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-modules-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-core-6.12.0-211.18.1.el10_2.aarch64.rpm
libperf-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-rt-devel-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-64k-modules-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-modules-extra-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-uki-virt-addons-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-modules-core-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-zfcpdump-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-64k-debug-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-core-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-core-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-debug-devel-matched-6.12.0-211.18.1.el10_2.s390x.rpm
libperf-debuginfo-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-debuginfo-common-ppc64le-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-modules-extra-matched-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-rt-debug-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-modules-extra-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-modules-core-6.12.0-211.18.1.el10_2.ppc64le.rpm
libperf-debuginfo-6.12.0-211.18.1.el10_2.aarch64.rpm
libperf-debuginfo-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-debug-devel-matched-6.12.0-211.18.1.el10_2.x86_64.rpm
perf-debuginfo-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-modules-extra-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-uki-virt-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-debug-6.12.0-211.18.1.el10_2.ppc64le.rpm
kernel-debuginfo-common-x86_64-6.12.0-211.18.1.el10_2.x86_64.rpm
kernel-debuginfo-common-s390x-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-zfcpdump-modules-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-64k-debug-modules-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-6.12.0-211.18.1.el10_2.s390x.rpm
kernel-64k-debug-modules-core-6.12.0-211.18.1.el10_2.aarch64.rpm
kernel-debug-uki-virt-6.12.0-211.18.1.el10_2.x86_64.rpm

Fixes

CVEs

References

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

Additional information

The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at Security Contacts and Procedures.
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