RHSA-2026:37186 - Security Advisory

Topic

Red Hat OpenShift Container Platform release 4.21.24 is now available with updates to packages and images that fix several bugs and add enhancements.

This release includes a security update for Red Hat OpenShift Container Platform 4.21.

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

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 4.21.24. See the following advisory for the RPM packages for this release:

https://access.redhat.com/errata/RHBA-2026:37184

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/4.21/html/release_notes/

Solution

For OpenShift Container Platform 4.21 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/4.21/html/release_notes/

You may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may 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 sha256:9ed4f92ef5d48054797e08789b9a09ebeb9bfd9c6cb6ebba2876e4e81aa09c73

(For s390x architecture)
The image digest is sha256:962b4ef5e92b07194c93e171ea848669455b6b1f406ea39920923f76baebf199

(For ppc64le architecture)
The image digest is sha256:6e3c893541269ddc36f75c82e8f0a10d4c75d363319fa06fa8cf927f9ce0af74

(For aarch64 architecture)
The image digest is sha256:c0f6e1264a7ee402a5403a9f024031ee9c5db95f996aa9997bf126e7608f682c

All OpenShift Container Platform 4.21 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/4.21/html-single/updating_clusters/index#updating-cluster-cli.

Affected Products

• Red Hat OpenShift Container Platform

Fixes

• BZ - 2453496
• BZ - 2466684
• BZ - 2477104
• BZ - 2488934
• BZ - 2494197
• OCPBUGS-87868 - [4.21]T-GM and T-BC fail with introduction of DPLL pin operational state
• OCPBUGS-88323 - Flaky TestDocExamples e2e test
• OCPBUGS-88564 - [release-4.21] CUDN NetworkAllocationSucceeded status condition tests is breaking origin tests
• OCPBUGS-90498 - [release-4.21] - Projects cannot be filtered by display name in the console list view
• OCPBUGS-91985 - [release-4.21] fallback to kube-system/global-pull-secret for Insights token
• OCPBUGS-92375 - [release-4.21] Update documentation links to link to documentation for version being used
• OCPBUGS-93920 - Prometheus pods fail to write the chunks with the error "cannot enable Direct IO: invalid argument"
• OCPBUGS-95062 - [4.21] IPA fails to heartbeat due to missing iproute package in ironic-agent container image
• OCPBUGS-95588 - Remove sensitive ControllerConfig logging
• OCPBUGS-96153 - [Automated] Update AMI Whitelist

CVEs

• CVE-2026-13676
• CVE-2026-44293
• CVE-2026-4800
• CVE-2026-6322
• CVE-2026-9595

References

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