RHSA-2026:9515: Moderate: kernel security update
Published Apr 22, 2026
·Updated
Moderate: kernel security update
Other sources
The kernel packages contain the Linux kernel, the core of any Linux operating system.Security Fix(es): kernel: net/sched: clsu32: use skbheaderpointercareful() (CVE-2026-23204) kernel: kernel: Privilege escalation or denial of service via use-after-free in nftablesaddchain() (CVE-2026-23231) 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
54 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Update Support Extension
Red Hat Red Hat Enterprise Linux Server - TUS
redhat/kernel<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/bpftool<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/bpftool-debuginfo<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-abi-stablelists<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-core<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-cross-headers<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debug<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debug-core<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debug-debuginfo<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debug-devel<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debug-modules<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debug-modules-extra<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debuginfo<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-devel<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-doc<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-headers<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-modules<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-modules-extra<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-tools<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-tools-debuginfo<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-tools-libs<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/perf<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/perf-debuginfo<4.18.0-477.136.1.el8_8
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redhat/python3-perf<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/python3-perf-debuginfo<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/bpftool<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/bpftool-debuginfo<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-core<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-cross-headers<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debug<4.18.0-477.136.1.el8_8
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redhat/kernel-debug-core<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debug-debuginfo<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debug-devel<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debug-modules<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debug-modules-extra<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debuginfo<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-debuginfo-common-ppc64le<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-devel<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-headers<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-modules<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-modules-extra<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-tools<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-tools-debuginfo<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/kernel-tools-libs<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/perf<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/perf-debuginfo<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/python3-perf<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
redhat/python3-perf-debuginfo<4.18.0-477.136.1.el8_8
4.18.0-477.136.1.el8_8
Remediation
Event History
Apr 22, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·12:03 AM
Data Sourced
via Red Hat·12:03 AM
Severity
Frequently Asked Questions
1
What is the severity of RHSA-2026:9515?
The severity of RHSA-2026:9515 is classified as moderate.
2
How do I fix RHSA-2026:9515?
To fix RHSA-2026:9515, update to the kernel version 4.18.0-477.136.1.el8_8.
3
What systems are affected by RHSA-2026:9515?
RHSA-2026:9515 affects Red Hat Enterprise Linux for x86_64 and Power LE systems among others.
4
What vulnerability does RHSA-2026:9515 address?
RHSA-2026:9515 addresses a privilege escalation vulnerability identified as CVE-2026-23204.
5
Is there any action needed for users of RHSA-2026:9515?
Yes, users should apply the necessary updates to protect against the reported vulnerabilities.