RHSA-2026:95104 - Security Advisory

Topic

Red Hat OpenShift Container Platform release 4.18.60 is now available with updates to packages and images that fix several bugs.

This release includes a security update for Red Hat OpenShift Container Platform 4.18.

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

Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments.

This advisory contains the container images for Red Hat OpenShift Container Platform 4.18.60. See the following advisory for the RPM packages for this release:

https://access.redhat.com/errata/RHSA-2026:95103

Space precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes:

https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/release_notes/

Security Fix(es):

• brotli: Out-of-Bounds Write in Google Brotli Decoder (CVE-2026-111497)
• kernel: ipv4: free inet_opt and ireq_opt after an RCU grace period (CVE-2026-98432)

Solution

For OpenShift Container Platform 4.18 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:

https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/release_notes/

You can download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests can be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.

The sha values for the release are as follows:

(For x86_64 architecture)
The image digest is sha256:d0253567dd0d96590d441b63c50cc410eb1ca8bd997116d4dc6717efa6527cdd

(For s390x architecture)
The image digest is sha256:b95487489131c3e283f9e9081d0c9c8a3b8ef9c927715d967c9ab2f56e8447cd

(For ppc64le architecture)
The image digest is sha256:b1172ab4261a13e2e3f5f2e8f3ec65d3e8eb181b88909981bac4a9aa4e0cfdfb

(For aarch64 architecture)
The image digest is sha256:490b644a91f7fc3a78c2e278996e8b30657e547eb89cb6b141ee71501c5a9396

All OpenShift Container Platform 4.18 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html-single/updating_clusters/index#updating-cluster-cli.

Affected Products

• Red Hat OpenShift Container Platform 4.18 for RHEL 9 x86_64
• Red Hat OpenShift Container Platform 4.18 for RHEL 8 x86_64
• Red Hat OpenShift Container Platform for Power 4.18 for RHEL 9 ppc64le
• Red Hat OpenShift Container Platform for Power 4.18 for RHEL 8 ppc64le
• Red Hat OpenShift Container Platform for IBM Z and LinuxONE 4.18 for RHEL 9 s390x
• Red Hat OpenShift Container Platform for IBM Z and LinuxONE 4.18 for RHEL 8 s390x
• Red Hat OpenShift Container Platform for ARM 64 4.18 for RHEL 9 aarch64
• Red Hat OpenShift Container Platform for ARM 64 4.18 for RHEL 8 aarch64

Fixes

• BZ - 2553390 - CVE-2026-98432 kernel: ipv4: free inet_opt and ireq_opt after an RCU grace period
• BZ - 2558973 - CVE-2026-111497 brotli: Out-of-Bounds Write in Google Brotli Decoder
• OCPBUGS-134631 - [4.18] Bootimage bump tracker

CVEs

• CVE-2026-98432
• CVE-2026-111497

References

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