RHBA-2026:10088 - Bug Fix Advisory

Topic

Red Hat OpenShift Container Platform release 4.21.12 is now available with updates to packages and images that fix several bugs.

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

https://access.redhat.com/errata/RHBA-2026:10086

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 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 sha256:809c037c016c7c0cbc83ce459ed344a55d65fa6cc0d3aa4d51e9a2d9d0cf7ffa

(For s390x architecture)
The image digest is sha256:f3d7608dea8d88f1becf86c81208e912b9ef3df98f7b5463d00ea29adfe8427a

(For ppc64le architecture)
The image digest is sha256:c19495d001c7562c7906717698e52264d361f2b4d5fa85942f0588f58b448eff

(For aarch64 architecture)
The image digest is sha256:b904fa61b72a427863b1e719113bd9b847ae4928c1e8fd8f782e88733aac39cb

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

• OCPBUGS-77639 - [4.21] linuxptp-daemon ART dockerfile is missing pciutils
• OCPBUGS-77943 - libvirt support should be dropped from machine-api-operator
• OCPBUGS-79421 - [release-4.21]OVE local UI shows "cluster details not found" error and blocks cluster creation after booting ISO
• OCPBUGS-79531 - [4.21] volume-data-source-validator should run on master (control plane) node
• OCPBUGS-82588 - Update OCP version in Konflux to 4.21.10
• OCPBUGS-82971 - csi-snapshot-controller PDB's Eviction Policy is set wrong
• OCPBUGS-83553 - CLONE - OPCT: Workflow environment is crashing while executing openshift/conformance suite [4.21]
• OCPBUGS-83566 - [release-4.21] Placeholder bug for branch sync
• OCPBUGS-83572 - [release-4.21] Dev Sandbox telemetry is not being used in Dev Sandbox clusters
• OCPBUGS-83615 - Internal LoadBalancer fails to create instance groups on multi-subnet GCP clusters
• OCPBUGS-83756 - [4.21] - config/v1 authentication type constants are not always typed constants

CVEs

(none)

References

(none)