RHSA-2026:20034 - Security Advisory

标题

Red Hat OpenShift Container Platform release 4.21.17 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.

描述

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

https://access.redhat.com/errata/RHBA-2026:20032

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/

解决方案

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 sha256:52a9c863ddc434eedee8c0e75cf610805db2b6b91502688857bc8afa62ed1dd6

(For s390x architecture)
The image digest is sha256:e1cd4053fdab99ef5530074cb61596de6d0c3b0fd091763051e93b69b4a47c11

(For ppc64le architecture)
The image digest is sha256:91b0028f1b17269e79f04e6638777c378fa6b4f0814f9b7ed26a0ee2cd0d3427

(For aarch64 architecture)
The image digest is sha256:370ca00b9618fe7e6a2444f68e63a869f2c4f3cd51f0e61e35b66dd87dda8652

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.

受影响的产品

• Red Hat OpenShift Container Platform

修复

• BZ - 2407258
• BZ - 2445291
• BZ - 2449833
• BZ - 2455470
• BZ - 2457729
• BZ - 2467620
• OCPBUGS-81501 - Cannot create NNCP by using "A single interface” in Uplink connection
• OCPBUGS-82142 - [4.21] Intermittent Pipeline Failure: Init Container "prepare" exits with Code 255 due to CRI-O/Process.
• OCPBUGS-83583 - cloud-event-proxy process hangs silently after restart, preventing clock class metric recovery
• OCPBUGS-83710 - HCCO fails to create EndpointSlices for KubeVirt guest LoadBalancer services due to link-local addresses being rejected
• OCPBUGS-84120 - Update OCP release version for OVE
• OCPBUGS-84169 - Control Plane Upgrade unable to complete with zero worker nodes [4.21 backport]
• OCPBUGS-84267 - T-BC clock class metrics permanently lost after cloud-event-proxy process restart
• OCPBUGS-84774 - Mirroring images from registry.connect.redhat.com fails due to missing .sig manifest - OCP 4.21
• OCPBUGS-85126 - MCD reports content mismatch on several nodes & clusters, blocking 4.18.36 upgrade
• OCPBUGS-85268 - [release-4.21][Below the sea UI] Improper parsing of mounted pull-secret.yaml leads to raw file rendering and validation failure
• OCPBUGS-85270 - Ungraceful shutdown leads to loss of all kube-apiserver certs
• OCPBUGS-85478 - Force rebuild machine-os-images for OCP 4.21
• OCPBUGS-85500 - Bump Kubernetes v1.34.8 to release-4.21
• OCPBUGS-85520 - CLONE - [release-4.21] Topology view: Visual connectors (arrows) between applications do not persist after dragging
• OCPBUGS-85526 - CLONE - CLONE - Update OVE UI Konflux references
• OCPBUGS-85563 - [4.21] Kube API Server with two service account issuers during the first 24h of cluster's lifetime
• OCPBUGS-85645 - all containers in ns/openshift-machine-config-operator must have terminationMessagePolicy=FallbackToLogsOnError
• OCPBUGS-85781 - CLONE - Hypershift Konnectivity fails to add AWS ISO (classified) domains to ingress operator's NO_PROXY list
• OCPBUGS-86063 - [release-4.21] - [OVE] Allow to install SNO topology
• OCPBUGS-86152 - 4.21: Verify job in aws-ebs-csi-driver insists on current copyright year

CVE

• CVE-2025-58183
• CVE-2026-29063
• CVE-2026-33186
• CVE-2026-34986
• CVE-2026-35469
• CVE-2026-41674

参考

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