Red Hat Security Advisory: OpenShift Container Platform 4.18.29 bug fix and security update
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 4.18.29. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/156359 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): * sssd: SSSD default Kerberos configuration allows privilege escalation on AD-joined Linux systems (CVE-2025-11561) * runc: container escape via 'masked path' abuse due to mount race conditions (CVE-2025-31133) * runc: container escape with malicious config due to /dev/console mount and related races (CVE-2025-52565) * runc: opencontainers/selinux: container escape and denial of service due to arbitrary write gadgets and procfs write redirects (CVE-2025-52881) 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.
AI Analysis
Technical Summary
This advisory covers security updates in Red Hat OpenShift Container Platform 4.18.29, which address four vulnerabilities: CVE-2025-11561 in sssd allowing privilege escalation on Active Directory-joined Linux systems due to default Kerberos configuration, and three container escape vulnerabilities in runc (CVE-2025-31133, CVE-2025-52565, CVE-2025-52881) caused by mount race conditions, malicious configuration involving /dev/console mounts, and arbitrary write gadgets with procfs write redirects. These vulnerabilities could allow attackers to escalate privileges or escape container isolation. The advisory recommends upgrading to the fixed container images and packages available in OpenShift Container Platform 4.18.29. No CVSS scores are provided in the advisory; however, the severity is rated as important/high by Red Hat.
Potential Impact
The vulnerabilities allow privilege escalation on AD-joined Linux systems (CVE-2025-11561) and container escape attacks (CVE-2025-31133, CVE-2025-52565, CVE-2025-52881), which could compromise container isolation and potentially lead to unauthorized access or denial of service. These issues affect the security boundary of containers and the underlying host systems in OpenShift Container Platform 4.18 prior to 4.18.29.
Mitigation Recommendations
Red Hat has released OpenShift Container Platform 4.18.29 containing fixes for these vulnerabilities. Users should upgrade to version 4.18.29 using the OpenShift CLI (oc) or web console as soon as the updated packages and container images are available in their release channel. Detailed upgrade instructions are provided by Red Hat at https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html-single/updating_clusters/index#updating-cluster-cli. No additional mitigations are indicated by the vendor advisory.
Red Hat Security Advisory: OpenShift Container Platform 4.18.29 bug fix and security update
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 4.18.29. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/156359 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): * sssd: SSSD default Kerberos configuration allows privilege escalation on AD-joined Linux systems (CVE-2025-11561) * runc: container escape via 'masked path' abuse due to mount race conditions (CVE-2025-31133) * runc: container escape with malicious config due to /dev/console mount and related races (CVE-2025-52565) * runc: opencontainers/selinux: container escape and denial of service due to arbitrary write gadgets and procfs write redirects (CVE-2025-52881) 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.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers security updates in Red Hat OpenShift Container Platform 4.18.29, which address four vulnerabilities: CVE-2025-11561 in sssd allowing privilege escalation on Active Directory-joined Linux systems due to default Kerberos configuration, and three container escape vulnerabilities in runc (CVE-2025-31133, CVE-2025-52565, CVE-2025-52881) caused by mount race conditions, malicious configuration involving /dev/console mounts, and arbitrary write gadgets with procfs write redirects. These vulnerabilities could allow attackers to escalate privileges or escape container isolation. The advisory recommends upgrading to the fixed container images and packages available in OpenShift Container Platform 4.18.29. No CVSS scores are provided in the advisory; however, the severity is rated as important/high by Red Hat.
Potential Impact
The vulnerabilities allow privilege escalation on AD-joined Linux systems (CVE-2025-11561) and container escape attacks (CVE-2025-31133, CVE-2025-52565, CVE-2025-52881), which could compromise container isolation and potentially lead to unauthorized access or denial of service. These issues affect the security boundary of containers and the underlying host systems in OpenShift Container Platform 4.18 prior to 4.18.29.
Mitigation Recommendations
Red Hat has released OpenShift Container Platform 4.18.29 containing fixes for these vulnerabilities. Users should upgrade to version 4.18.29 using the OpenShift CLI (oc) or web console as soon as the updated packages and container images are available in their release channel. Detailed upgrade instructions are provided by Red Hat at https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html-single/updating_clusters/index#updating-cluster-cli. No additional mitigations are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:21795
- Cve Count
- 4
- Additional Cves
- ["CVE-2025-31133","CVE-2025-52565","CVE-2025-52881"]
Threat ID: 6a160975e29bf47b5063f752
Added to database: 05/26/2026, 20:58:29 UTC
Last enriched: 08/14/2026, 22:24:16 UTC
Last updated: 09/10/2026, 19:24:55 UTC
Views: 96
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