RHSA-2026:54187HighCVSS 8.8

Red Hat Security Advisory: OpenShift Container Platform 4.13.70 bug fix and security update

Published
August 20, 2026
Last Modified
August 21, 2026

🔗 CVE IDs covered (7)

CVE-2026-31790 →CVE-2026-43329 →CVE-2026-53359 →CVE-2025-10263 →CVE-2025-40026 →CVE-2026-14474 →CVE-2026-14476 →

📋 Description

CVE-2025-10263 — kernel: Arm Processors: Privilege escalation or information disclosure via writes to higher exception level resources CVE-2025-40026 — kernel: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O CVE-2026-14474 — sssd: sssd: sudo LDAP provider searches entire directory tree for sudoRole objects by default, enabling privilege escalation CVE-2026-14476 — sssd: sssd: GPO cache path traversal via unsanitized gPCFileSysPath allows Kerberos authentication bypass CVE-2026-31790 — openssl: openssl: Information Disclosure from Uninitialized Memory via Invalid RSA Public Key CVE-2026-43329 — kernel: netfilter: flowtable: strictly check for maximum number of actions CVE-2026-53359 — kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role

🎯 Affected products2

  • Red Hat OpenShift Container Platform 4.13
  • rhcos-x86_64-413.92.202608111330-0 as a component of Red Hat OpenShift Container Platform 4.13

✅ Remediation

For OpenShift Container Platform 4.13 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/4.13/html/release_notes You may download the oc tool and use it to inspect release image metadata for x86_64 architecture. The image digest may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags. The sha value for the release is as follows: (For x86_64 architecture) The image digest is sha256:033e3d7ba0937c0b3d2f88993bbe2e97c8b396f1782a7353c68ebe1282b2586c All OpenShift Container Platform 4.13 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/4.13/html-single/updating_clusters/index#updating-cluster-within-minor. Workaround: This vulnerability can be mitigated by disabling nested virtualization. Create a file in `/etc/modprobe.d/` with a descriptive name, such as `cve-2026-53359-mitigation.conf`. In that file, disable nested virtualization for the `kvm_intel` and `kvm_amd` kernel modules: ``` options kvm-intel nested=0 options kvm-amd nested=0 ``` Use `lsmod` to determine if either module is already loaded. If so, remove loaded modules with `modprobe -r`. To validate that nested virtualization is disabled, read the files `/sys/module/kvm_intel/parameters/nested` and `/sys/module/kvm_amd/parameters/nested`. If these modules are loaded, those files should read `N` to indicate that the feature is disabled. In OpenShift 4, a MachineConfig can be utilized to create a modprobe configuration allowing control of the module on applicable nodes. See the following article for an example. https://access.redhat.com/solutions/6979679 Workaround: Set ldap_sudo_search_base explicitly in /etc/sssd/sssd.conf to restrict the search to the designated sudoers container: [domain/example.com] ldap_sudo_search_base = ou=sudoers,dc=example,dc=com Additionally, restrict LDAP ACLs to prevent non-admin principals from creating sudoRole objects outside the designated sudoers container. Workaround: Set ad_gpo_access_control = disabled in /etc/sssd/sssd.conf to disable GPO fetching entirely. Note that this removes GPO-based login policy enforcement. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

🔗 References (10)