RHSA-2026:29834 - Security Advisory

Topic

Red Hat OpenShift Container Platform release 4.21.22 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 4.21.22. See the following advisory for the RPM packages for this release:

https://access.redhat.com/errata/RHBA-2026:29832

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 sha256:52e54316796bcb6f31212edf0c0c4f89d0383232371d5d0a5cfed1513198b94b

(For s390x architecture)
The image digest is sha256:1ffc16865f1ee1ecc25fc02eb8c9e14d074ae8bf57928665afc7890b002a3e3b

(For ppc64le architecture)
The image digest is sha256:d95843b934c121e386ac5499b0f7289017bf9c3ad46ede745c23431ba4fe804f

(For aarch64 architecture)
The image digest is sha256:e06817050a33fd33ec58e7e2942921bd91ce3c736a12acefb74dac80503e680d

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 - 2466684
• BZ - 2480741
• OCPBUGS-86040 - Control Plane PKI Operator Sets Certificate Revoked Before KAS Changes Propagated
• OCPBUGS-86869 - Upgrade envtest Makefile target in ingress-node-firewall
• OCPBUGS-87873 - Support hermetic builds for machine-os-images via Cachi2 prefetched ISO images
• OCPBUGS-88313 - [release-4.21] Create UserDefinedNetwork fails to trim whitespace from CIDR spec
• OCPBUGS-88328 - [4.21.z] - Fix Pod.Create() to use --local flag for template processing
• OCPBUGS-88340 - vSphere boot image hot loop detection is non-functional due to stable template names
• OCPBUGS-88709 - Stabilize `A MachineOSConfig with custom containerfile definition can be successfully applied` OCB test
• OCPBUGS-89243 - Stabilize `A successfully built MachineOSConfig can be re-build` test on SNO
• OCPBUGS-89340 - Skopeo install script is redundant
• OCPBUGS-89353 - HyperShift operator image includes non-CGO binary (hypershift-no-cgo) causing Enterprise Contract FIPS violations
• OCPBUGS-90529 - [4.21] oslat latency test hardcodes runner pod memory to 1Gi, causing OOMKilled at higher LATENCY_TEST_CPUS values
• OCPBUGS-90543 - etcd-operator enters unrecoverable deadlock when etcd-endpoints configmap contains only unreachable IPs
• OCPBUGS-91972 - [4.21] Installation of VPA on HCP fails due to lack of Control Plane nodes

CVEs

• CVE-2026-6322
• CVE-2026-9277

References

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