RHSA-2026:2984 - Security Advisory

Topic

Red Hat OpenShift Container Platform release 4.21.3 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 4.21.3. See the following advisory for the RPM packages for this release:

https://access.redhat.com/errata/RHBA-2026:2982

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 sha256:994bbf87fec04efb0e89ffbc54b2d37590d48e6a804c78cf2cf62dd9bc156793

(For s390x architecture)
The image digest is sha256:1d680915661aabcbff79625727c046a9ad2fbd6a8defebe91db904080bc31a38

(For ppc64le architecture)
The image digest is sha256:f04b60e0d476794ef777791e8d13545a6d76c907f0bab2713124d72899429bfd

(For aarch64 architecture)
The image digest is sha256:7a9e327f5a79b67d4347203f63cd53dcdd508834355b3b3c766bb93db2859412

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 - 2431740
• OCPBUGS-62009 - hostfirmwarecomponents with BIOS and BMC update only updated the BMC
• OCPBUGS-63713 - kubelet garbage collection causes out of order high perf hook runs leading to wrong IRQ SMP affinity
• OCPBUGS-69644 - MAPO creates events when reconciling machines
• OCPBUGS-70145 - appliance should preserve digests for docker-image registry
• OCPBUGS-71133 - allowedCIDRBlocks removed should also remove the LoadBalancerSourceRanges for the external router LoadBalancer service
• OCPBUGS-73805 - machine-config-daemon is kill while updating the system-units on the node, leading to disabled system-units after reboot.
• OCPBUGS-73878 - Azure: install failed during destroying bootstrap if private cluster is not created in byo vnet
• OCPBUGS-74545 - CCO pod crashing with nil pointer exception
• OCPBUGS-74981 - [v2] While mirroring rebuilt catalog with oc-mirror receiving "Instructed to preserve digests" error
• OCPBUGS-76126 - The `use-sigstore-attachments` option in the `default.yaml` file is not work
• OCPBUGS-76282 - [4.21] Telco: BIOS + BMC Firmware Update Fixes
• OCPBUGS-76358 - Failed to destroy bootstrap by running command "openshift-install destroy bootstrap"
• OCPBUGS-76411 - Include additional operators in OVE UI ISO config
• OCPBUGS-76474 - [4.21] Agent service is failing with input/output error
• OCPBUGS-76492 - [4.21] BMO fails to start servicing despite updates to HFC spec
• OCPBUGS-76499 - [4.21] Jobset operator failed to launch the jobset controller with error : undefined field 'namespace'
• OCPBUGS-76542 - [release-4.21][Appliance] Fix IRI release max length to support CI jobs
• OCPBUGS-76590 - Update Konflux files to build 4.21.1
• OCPBUGS-76994 - [4.21] HCP node CSR not approved in dual stack configuration

CVEs

• CVE-2025-13465

References

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