CVE-2026-76654

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{"bugzilla": {"description": "kubelet: kubelet: Subpath symlinking on Windows nodes permits NTLM coercion", "id": "2526745", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2526745"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-59", "details": ["A flaw was found in Kubernetes kubelet on Windows nodes. When kubelet resolves a volume subPath that is a symbolic link, it does not reject an ordinary UNC network path. Following that link causes Windows to authenticate to the remote share with NTLM, exposing the NetNTLMv2 hash of the kubelet account. That hash may be cracked or, if the node is domain-joined, used in an NTLM relay."], "mitigation": {"lang": "en:us", "value": "Clusters with no Windows nodes need no change. \nThese steps reduce exposure:\n- Limit who can create pods that schedule onto Windows nodes.\n- Prevent Windows nodes from opening SMB/UNC connections to untrusted networks."}, "name": "CVE-2026-76654", "package_state": [{"cpe": "cpe:/a:redhat:windows_machine_config", "fix_state": "Fix deferred", "package_name": "openshift4-wincw/windows-machine-config-operator-bundle", "product_name": "Red Hat OpenShift for Windows Containers"}, {"cpe": "cpe:/a:redhat:windows_machine_config", "fix_state": "Fix deferred", "package_name": "openshift4-wincw/windows-machine-config-rhel9-operator", "product_name": "Red Hat OpenShift for Windows Containers"}], "public_date": "2026-09-15T16:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-76654\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-76654\nhttps://github.com/openshift/kubernetes/pull/2793"], "statement": "Only Windows workers are in scope. WMCO is what ships and installs kubelet.exe on those nodes. The Linux kubelet used on control plane and RHCOS workers does not include the vulnerable Windows path.", "threat_severity": "Moderate"}

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