RHSA-2026:40792 - Security Advisory

Topic

Red Hat OpenShift Container Platform release 4.21.25 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 4.21.25. See the following advisory for the RPM packages for this release:

https://access.redhat.com/errata/RHBA-2026:40778

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 sha256:116cabb556737a4a36e17f1761c718e70bccd66c10d722f9b0a678074061735b

(For s390x architecture)
The image digest is sha256:104953e69b5d7be2ce775701775d21843404f4b649d9825ab4794098003146d8

(For ppc64le architecture)
The image digest is sha256:a1b23175ec864db1abc82ff8417f1abca9d60378e0f31066c1875b41755d83d8

(For aarch64 architecture)
The image digest is sha256:d83a9065f6052d50bd4fd9979db76f3bed822bcf0b53954f07018e3fe443b409

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 - 2449833
• BZ - 2466505
• BZ - 2477914
• BZ - 2487937
• BZ - 2487942
• BZ - 2487948
• BZ - 2487949
• OCPBUGS-81747 - Incorrect specification of UID ranges in nested-container SCC
• OCPBUGS-86295 - HyperShift operator registry overrides don't apply to cluster-api and capi-provider deployments in 4.21+
• OCPBUGS-88704 - T-BC CLOCK_REALTIME stuck at FREERUN due to dual-publisher conflict in ParseTBCLogs and extractRegularMetrics
• OCPBUGS-89234 - In OCB to check when a image is removed the old build is triggered again and the MC should start updating directly and no new MOSB should be triggred
• OCPBUGS-91644 - [4.21] Cloud-event-proxy reports stale offset and incorrect FREERUN state despite healthy phc2sys synchronization.
• OCPBUGS-91971 - In vsphere, create new template should be an atomic operation
• OCPBUGS-93927 - [4.21] - VPCEndpointService should not try and create >1 Endpoint per AZ
• OCPBUGS-97825 - Failed to create a network port when an OpenStack cloud provider does not support the optional network extension for tags
• OCPBUGS-97905 - machine-config-controller boot image controller requires proxy support for outbound OVA downloads
• OCPBUGS-97962 - [4.21] ptp-operator: backport gm_offset threshold check before SDP pin enablement to fix DPLL lock failure on GNR-D (E825-C) systems
• OCPBUGS-97982 - [4.21] Missing finalizer on hostfirmwarecomponents CR
• OCPBUGS-98251 - Kube-controller-manager panic due to unrecognized serviceAccountToken volume type during login

CVEs

• CVE-2026-33186
• CVE-2026-42154
• CVE-2026-44487
• CVE-2026-44488
• CVE-2026-44494
• CVE-2026-44495
• CVE-2026-45736

References

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