RHSA-2026:79035: Important: OpenShift Container Platform 4.18.57 bug fix and security update

- Issued: - 2026-10-15 - Updated: - 2026-10-15 RHSA-2026:79035 - Security Advisory Synopsis Important: OpenShift Container Platform 4.18.57 bug fix and security update Type/Severity Security Advisory: Important Topic Red Hat OpenShift Container Platform release 4.18.57 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 4.18.57. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/RHSA-2026:79034 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): - kernel: sctp: prevent peer transport count overflow (CVE-2026-74469) - kernel: xfrm: ah6: validate routing header segments_left (CVE-2026-80844) - kernel: net: tun: bound receive headroom (CVE-2026-81000) 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 sha256:7a0078ddb04d84aace3976582be4c7b6b3bf095c8e899a7459d3c61ec8bfe5c0 (For s390x architecture) The image digest is sha256:73b54cac46826fcbc423506e1f35ee5140b06060cf56ef5750c6837e3318c85c (For ppc64le architecture) The image digest is sha256:8b84765c92b6586f3a6a3747645484a36738ea1c2551013680c2ca85b5919d8a (For aarch64 architecture) The image digest is sha256:683a1a3232929b959d9476b537e06e017e3c4ab699b453a89ac891de5e06507d 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 - 2517043 - CVE-2026-74469 kernel: sctp: prevent peer transport count overflow - BZ - 2528676 - CVE-2026-80844 kernel: xfrm: ah6: validate routing header segments_left - BZ - 2532176 - CVE-2026-81000 kernel: net: tun: bound receive headroom The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.