Issued:

2026-08-04

Updated:

2026-08-04

RHSA-2026:49857 - Moderate: kernel security, bug fix, and enhancement update

Synopsis

Moderate: kernel security, bug fix, and enhancement update

Type/Severity

Security Advisory: Moderate

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 Moderate. 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: ipc: limit next_id allocation to the valid ID range (CVE-2026-52923)

Bug Fix(es) and Enhancement(s):

• RHEL8.10 - KVM: s390: Limit adapter indicator access to mapped page (JIRA:RHEL-183880)

• CIFS mounts do not work with the latest kernel (JIRA:RHEL-213976)

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.

Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.

Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.

Affected Products

Updated Packages

• kernel-debuginfo-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-cross-headers-4.18.0-553.151.1.el8_10.aarch64.rpm
• bpftool-debuginfo-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-debug-core-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-zfcpdump-modules-extra-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-modules-extra-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-debug-modules-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-zfcpdump-devel-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-modules-extra-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-headers-4.18.0-553.151.1.el8_10.s390x.rpm
• python3-perf-debuginfo-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-4.18.0-553.151.1.el8_10.aarch64.rpm
• bpftool-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-headers-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-core-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-debuginfo-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-debug-debuginfo-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-tools-libs-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-tools-libs-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-debug-devel-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-debug-modules-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-debug-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-abi-stablelists-4.18.0-553.151.1.el8_10.noarch.rpm
• kernel-debug-modules-extra-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-debug-core-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-debuginfo-common-ppc64le-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-devel-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-tools-debuginfo-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-tools-debuginfo-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-debug-modules-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-doc-4.18.0-553.151.1.el8_10.noarch.rpm
• kernel-tools-libs-devel-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-tools-libs-devel-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-zfcpdump-modules-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-tools-libs-devel-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-cross-headers-4.18.0-553.151.1.el8_10.ppc64le.rpm
• bpftool-debuginfo-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-tools-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-zfcpdump-core-4.18.0-553.151.1.el8_10.s390x.rpm
• perf-debuginfo-4.18.0-553.151.1.el8_10.x86_64.rpm
• python3-perf-debuginfo-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-core-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-debug-modules-extra-4.18.0-553.151.1.el8_10.x86_64.rpm
• perf-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-zfcpdump-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-headers-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-4.18.0-553.151.1.el8_10.ppc64le.rpm
• perf-4.18.0-553.151.1.el8_10.x86_64.rpm
• bpftool-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-modules-4.18.0-553.151.1.el8_10.x86_64.rpm
• perf-debuginfo-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-devel-4.18.0-553.151.1.el8_10.s390x.rpm
• python3-perf-debuginfo-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-debug-core-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-core-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-debug-devel-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-zfcpdump-debuginfo-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-debug-debuginfo-4.18.0-553.151.1.el8_10.x86_64.rpm
• bpftool-debuginfo-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-tools-debuginfo-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-modules-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-debuginfo-common-s390x-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-debuginfo-common-aarch64-4.18.0-553.151.1.el8_10.aarch64.rpm
• python3-perf-4.18.0-553.151.1.el8_10.s390x.rpm
• perf-debuginfo-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-debuginfo-common-x86_64-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-tools-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-debug-modules-extra-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-4.18.0-553.151.1.el8_10.src.rpm
• kernel-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-debug-devel-4.18.0-553.151.1.el8_10.x86_64.rpm
• bpftool-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-modules-extra-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-debug-modules-extra-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-modules-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-modules-extra-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-debug-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-tools-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-debug-core-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-debug-debuginfo-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-devel-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-modules-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-core-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-cross-headers-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-tools-4.18.0-553.151.1.el8_10.x86_64.rpm
• bpftool-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-headers-4.18.0-553.151.1.el8_10.ppc64le.rpm
• kernel-tools-debuginfo-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-debug-4.18.0-553.151.1.el8_10.ppc64le.rpm
• perf-4.18.0-553.151.1.el8_10.ppc64le.rpm
• bpftool-debuginfo-4.18.0-553.151.1.el8_10.aarch64.rpm
• perf-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-debug-devel-4.18.0-553.151.1.el8_10.aarch64.rpm
• python3-perf-4.18.0-553.151.1.el8_10.ppc64le.rpm
• python3-perf-4.18.0-553.151.1.el8_10.x86_64.rpm
• python3-perf-debuginfo-4.18.0-553.151.1.el8_10.aarch64.rpm
• python3-perf-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-debuginfo-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-debuginfo-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-debug-modules-4.18.0-553.151.1.el8_10.ppc64le.rpm
• perf-debuginfo-4.18.0-553.151.1.el8_10.s390x.rpm
• kernel-debug-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-debug-debuginfo-4.18.0-553.151.1.el8_10.aarch64.rpm
• kernel-cross-headers-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-devel-4.18.0-553.151.1.el8_10.x86_64.rpm
• kernel-tools-libs-4.18.0-553.151.1.el8_10.ppc64le.rpm

Fixes

• This content is not included.BZ - 2492094

CVEs

• CVE-2026-52923

References

• https://access.redhat.com/security/updates/classification/#moderate

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.