RHSA-2025:8284 - Security Advisory

Topic

Red Hat OpenShift Container Platform release 4.18.16 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 4.18.

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

https://access.redhat.com/errata/RHBA-2025:8285

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/4.18/html/release_notes/

Security Fix(es):

• zlib: Out-of-bounds pointer arithmetic in inftrees.c (CVE-2016-9840)
• golang.org/x/oauth2/jws: Unexpected memory consumption during token

parsing in golang.org/x/oauth2/jws (CVE-2025-22868)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

All OpenShift Container Platform 4.18 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/4.18/html-single/updating_clusters/index#updating-cluster-cli.

Solution

For OpenShift Container Platform 4.18 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/4.18/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 sha256:0dac222584991f89a123d85e8c3055f0056e5876fc209b8d4bea7a59e7504d59

(For s390x architecture)
The image digest is sha256:33f8af4513fc5394c3210f5a3b447f4920cc9bd099830479d05f3799ae80f0a5

(For ppc64le architecture)
The image digest is sha256:8e522017e74e046cf57a76545fe6cc2cd742a79ff17bc22d66eee5126e5907c4

(For aarch64 architecture)
The image digest is sha256:12d59fd82eb938b06896679cc9a821651a2b05fdf74d0d23e528977f0fb11461

All OpenShift Container Platform 4.18 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/4.18/html-single/updating_clusters/index#updating-cluster-cli.

Affected Products

• Red Hat OpenShift Container Platform 4.18 for RHEL 9 x86_64
• Red Hat OpenShift Container Platform 4.18 for RHEL 8 x86_64
• Red Hat OpenShift Container Platform for Power 4.18 for RHEL 9 ppc64le
• Red Hat OpenShift Container Platform for Power 4.18 for RHEL 8 ppc64le
• Red Hat OpenShift Container Platform for IBM Z and LinuxONE 4.18 for RHEL 9 s390x
• Red Hat OpenShift Container Platform for IBM Z and LinuxONE 4.18 for RHEL 8 s390x
• Red Hat OpenShift Container Platform for ARM 64 4.18 for RHEL 9 aarch64
• Red Hat OpenShift Container Platform for ARM 64 4.18 for RHEL 8 aarch64

Fixes

• BZ - 1402345 - CVE-2016-9840 zlib: Out-of-bounds pointer arithmetic in inftrees.c
• BZ - 2348366 - CVE-2025-22868 golang.org/x/oauth2/jws: Unexpected memory consumption during token parsing in golang.org/x/oauth2/jws
• OCPBUGS-52189 - In OCL MOSBs are leaked
• OCPBUGS-53142 - PowerVS: COS eu-es hack
• OCPBUGS-54337 - Debug pod logs are not accessible when debugging a node via OpenShift Console
• OCPBUGS-54532 - RHEL 8 node addition fails with package missing from RHEL8 repos
• OCPBUGS-55638 - Avoid contention over bootimages between GitOps, etc. and the MCO
• OCPBUGS-55840 - [4.18] Enable RHCOS IBM Secure Execution installation on IBM Z17
• OCPBUGS-56043 - [v2] helm repo mirroring is failing with Docker references with both a tag and digest are currently not supported
• OCPBUGS-56097 - Missing NetworkManager logs for ironic-python-agent
• OCPBUGS-56217 - OS Validation check doesn't always work
• OCPBUGS-56401 - Add hot loop detection in MSBIC
• OCPBUGS-56431 - [4.18] Poor handling of incomplete Redfish URLs
• OCPBUGS-56524 - HostedControlPlane: switch admission registration API from v1beta1 to v1
• OCPBUGS-56627 - Validate OCP API Server info only if reconciling KPI
• OCPBUGS-56654 - OCP on Azure MachineSet scaling up fails after upgrade to 4.15.48+ on non zonal region

CVEs

• CVE-2016-9840
• CVE-2021-47495
• CVE-2023-52622
• CVE-2023-52703
• CVE-2023-52840
• CVE-2024-12133
• CVE-2024-12243
• CVE-2024-26901
• CVE-2024-26907
• CVE-2024-26973
• CVE-2024-27013
• CVE-2024-35946
• CVE-2024-57876
• CVE-2025-2784
• CVE-2025-4948
• CVE-2025-21756
• CVE-2025-22868
• CVE-2025-32049
• CVE-2025-32914
• CVE-2025-37749

References

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