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

RHSA-2026:21556 - 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 9.

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: proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al (CVE-2025-38653)
kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)
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: 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: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold (CVE-2026-31408)
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: 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: smb: client: validate the whole DACL before rewriting it in cifsacl (CVE-2026-31709)
kernel: Bluetooth: SCO: fix race conditions in sco_sock_connect() (CVE-2026-43023)
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: 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	9	x86_64
Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions	9.8	x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support	9.8	x86_64
Red Hat Enterprise Linux for x86_64 - Extended Life Cycle	9.8	x86_64
Red Hat Enterprise Linux for Power, little endian	9	ppc64le
Red Hat Enterprise Linux for Power, little endian - Extended Update Support	9.8	ppc64le
Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle	9.8	ppc64le
Red Hat Enterprise Linux for IBM z Systems	9	s390x
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support	9.8	s390x
Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle	9.8	s390x
Red Hat Enterprise Linux for IBM z Systems - 4 years of updates	9.8	s390x
Red Hat Enterprise Linux for ARM 64	9	aarch64
Red Hat Enterprise Linux for ARM 64 - Extended Update Support	9.8	aarch64
Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle	9.8	aarch64
Red Hat Enterprise Linux for ARM 64 - 4 years of updates	9.8	aarch64
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions	9.8	ppc64le
Red Hat CodeReady Linux Builder for x86_64	9	x86_64
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support	9.8	x86_64
Red Hat CodeReady Linux Builder for Power, little endian	9	ppc64le
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support	9.8	ppc64le
Red Hat CodeReady Linux Builder for IBM z Systems	9	s390x
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support	9.8	s390x
Red Hat CodeReady Linux Builder for ARM 64	9	aarch64
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support	9.8	aarch64

Updated Packages

kernel-debug-debuginfo-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-tools-debuginfo-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-tools-libs-5.14.0-687.12.1.el9_8.ppc64le.rpm
libperf-debuginfo-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-debug-debuginfo-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-devel-matched-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-modules-extra-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-modules-extra-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-rt-64k-debug-debuginfo-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-64k-debug-modules-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-debug-5.14.0-687.12.1.el9_8.aarch64.rpm
libperf-debuginfo-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-core-5.14.0-687.12.1.el9_8.aarch64.rpm
python3-perf-5.14.0-687.12.1.el9_8.ppc64le.rpm
rtla-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-rt-modules-extra-5.14.0-687.12.1.el9_8.x86_64.rpm
rv-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-zfcpdump-5.14.0-687.12.1.el9_8.s390x.rpm
python3-perf-debuginfo-5.14.0-687.12.1.el9_8.x86_64.rpm
rtla-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-debuginfo-common-x86_64-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-rt-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-rt-debug-core-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-devel-matched-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-tools-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-debuginfo-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-devel-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-debug-devel-matched-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-modules-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-64k-debug-core-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-headers-5.14.0-687.12.1.el9_8.ppc64le.rpm
perf-debuginfo-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-modules-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-rt-debug-debuginfo-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-cross-headers-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-rt-debuginfo-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-modules-core-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debuginfo-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-64k-modules-core-5.14.0-687.12.1.el9_8.aarch64.rpm
libperf-5.14.0-687.12.1.el9_8.x86_64.rpm
perf-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-cross-headers-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-devel-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-debug-debuginfo-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-zfcpdump-debuginfo-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-rt-modules-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-rt-debug-devel-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-tools-libs-devel-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-zfcpdump-devel-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-zfcpdump-devel-matched-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-cross-headers-5.14.0-687.12.1.el9_8.ppc64le.rpm
rv-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-rt-debug-modules-extra-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-modules-extra-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-zfcpdump-modules-extra-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-core-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-rt-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debuginfo-common-s390x-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-zfcpdump-modules-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-modules-extra-5.14.0-687.12.1.el9_8.x86_64.rpm
python3-perf-debuginfo-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-rt-64k-debug-core-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-uki-virt-5.14.0-687.12.1.el9_8.x86_64.rpm
python3-perf-5.14.0-687.12.1.el9_8.aarch64.rpm
rtla-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-abi-stablelists-5.14.0-687.12.1.el9_8.noarch.rpm
kernel-core-5.14.0-687.12.1.el9_8.ppc64le.rpm
rv-5.14.0-687.12.1.el9_8.aarch64.rpm
libperf-debuginfo-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-64k-debuginfo-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-devel-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-modules-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-modules-core-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-64k-debug-modules-core-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-core-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-headers-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-5.14.0-687.12.1.el9_8.src.rpm
kernel-rt-core-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-tools-debuginfo-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-debug-modules-core-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-tools-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-devel-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-doc-5.14.0-687.12.1.el9_8.noarch.rpm
kernel-rt-debug-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-headers-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-debug-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-64k-debug-devel-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-tools-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-64k-debug-debuginfo-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-tools-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-debug-modules-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-devel-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-debug-devel-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-debug-modules-core-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-debug-modules-core-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-cross-headers-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-debug-modules-core-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-tools-debuginfo-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-tools-debuginfo-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-rt-64k-debug-modules-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-64k-core-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-modules-extra-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-debug-modules-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-devel-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-debug-devel-matched-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-rt-debug-modules-5.14.0-687.12.1.el9_8.aarch64.rpm
perf-5.14.0-687.12.1.el9_8.aarch64.rpm
perf-5.14.0-687.12.1.el9_8.ppc64le.rpm
perf-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-debug-core-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debuginfo-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-rt-modules-extra-5.14.0-687.12.1.el9_8.aarch64.rpm
perf-debuginfo-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-64k-debug-devel-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-devel-matched-5.14.0-687.12.1.el9_8.ppc64le.rpm
python3-perf-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-debug-modules-extra-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-tools-libs-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-headers-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-zfcpdump-core-5.14.0-687.12.1.el9_8.s390x.rpm
python3-perf-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-64k-modules-extra-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-uki-virt-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-rt-debug-modules-extra-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-modules-core-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-zfcpdump-modules-core-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-debug-core-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-64k-modules-core-5.14.0-687.12.1.el9_8.aarch64.rpm
libperf-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-rt-debug-devel-5.14.0-687.12.1.el9_8.aarch64.rpm
libperf-debuginfo-5.14.0-687.12.1.el9_8.s390x.rpm
libperf-5.14.0-687.12.1.el9_8.ppc64le.rpm
rv-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-modules-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-modules-core-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-rt-devel-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debuginfo-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-64k-debug-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-64k-modules-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-64k-devel-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-modules-extra-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-debug-core-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-uki-virt-addons-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-debug-modules-core-5.14.0-687.12.1.el9_8.s390x.rpm
libperf-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-64k-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-64k-debug-modules-extra-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-core-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-debuginfo-common-ppc64le-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-devel-matched-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-rt-64k-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-64k-devel-matched-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-modules-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-rt-64k-debug-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-64k-modules-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-debug-modules-core-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-devel-matched-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-rt-modules-core-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-modules-core-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-tools-libs-devel-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-tools-libs-devel-5.14.0-687.12.1.el9_8.x86_64.rpm
python3-perf-debuginfo-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-debuginfo-common-aarch64-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-modules-5.14.0-687.12.1.el9_8.aarch64.rpm
perf-debuginfo-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-rt-64k-core-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-64k-devel-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-core-5.14.0-687.12.1.el9_8.aarch64.rpm
python3-perf-debuginfo-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-debug-modules-extra-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-debug-devel-matched-5.14.0-687.12.1.el9_8.x86_64.rpm
rtla-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-rt-debuginfo-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-64k-debuginfo-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-64k-debug-modules-core-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-debug-modules-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-debuginfo-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-rt-devel-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-debug-modules-5.14.0-687.12.1.el9_8.ppc64le.rpm
kernel-rt-64k-modules-extra-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-64k-debug-modules-extra-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-tools-libs-5.14.0-687.12.1.el9_8.x86_64.rpm
kernel-core-5.14.0-687.12.1.el9_8.s390x.rpm
kernel-debug-devel-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-64k-debug-devel-matched-5.14.0-687.12.1.el9_8.aarch64.rpm
perf-debuginfo-5.14.0-687.12.1.el9_8.aarch64.rpm
kernel-rt-debug-debuginfo-5.14.0-687.12.1.el9_8.aarch64.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.
Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.