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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteTo find what people and workloads can actually do in a Kubernetes cluster, trace each RoleBinding and ClusterRoleBinding to its subjects and referenced role, then evaluate the rules in scope. Reviewing role definitions alone misses who receives the permissions. Validate representative actions with kubectl auth can-i, and treat audit records as context—not proof that unused access is unnecessary.
What a Kubernetes RBAC grant consists of
Kubernetes RBAC has four core object types: Roles and ClusterRoles define rules; RoleBindings and ClusterRoleBindings attach those rules to subjects. The subject may be a user, group, or service account. The official RBAC documentation describes this object model.
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Scope depends on the binding, not just the referenced role:
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- A RoleBinding grants permissions in its own namespace. It can reference a Role or a ClusterRole; even when it references a ClusterRole, that binding’s grant is limited to its namespace.
- A ClusterRoleBinding grants the referenced ClusterRole’s permissions cluster-wide.
Kubernetes RBAC permissions are additive: it has no negative deny rules. A narrower allow does not cancel a broader allow elsewhere. To remove unwanted access, find and change the binding or rule that supplies it. The tested authorization result can also reflect authorization mechanisms beyond RBAC, so it does not by itself identify which RBAC object allowed an action. See Kubernetes authorization.
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Run the audit in a traceable sequence
1. Set the review boundary
Record the cluster, environment, review date, and namespaces in scope. List the identities to examine, including individual users, groups, and service accounts. Confirm how external identity systems map to Kubernetes subjects: authorization evaluates the subject presented in the request, so an identity-provider display name is not necessarily the Kubernetes username or group name.
2. Collect all four object kinds
Keep the complete output so subject names, namespaces, role references, resources, and verbs remain available for analysis. These read-only commands are a practical starting point; adapt output handling to your access controls and retention requirements.
kubectl get roles,rolebindings -A -o yaml
kubectl get clusterroles,clusterrolebindings -o yaml3. Resolve every binding into a grant
For each binding, record its namespace when applicable, every subject’s kind and exact name, the roleRef kind and name, and the effective scope. Expand the referenced role’s rules, then group the results by subject. This lets you answer both “who receives this role?” and “what can this identity do?”
Pay particular attention to ClusterRoleBindings and to RoleBindings that reference ClusterRoles: the former are cluster-wide, while the latter are namespace-limited. A role’s name is not enough to judge its reach; inspect its rules and the binding that attaches it.
4. Review the permissions that could matter most
Compare each grant with the workload or job’s actual purpose. Assess scope, subject, resources, and verbs together. Look for wildcard verbs or resources, access to sensitive resources such as Secrets, and permissions that can change roles or bindings. The Kubernetes RBAC guide also calls out bind and escalate in restrictions on granting rights beyond those a subject already holds. Review impersonation permissions separately; Kubernetes authorization covers impersonation of users, groups, and service accounts.
Consider access to credentials and workload capabilities when evaluating whether a permission could broaden access. A broad-looking grant is not automatically unnecessary, and a narrowly named role is not automatically safe: ask the responsible owner to justify the specific resources, verbs, and scope.
5. Check representative effective access
Use kubectl auth can-i to test actions the review cares about. For example:
kubectl auth can-i get pods -n payments --as=system:serviceaccount:payments:reporter
kubectl auth can-i list secrets -n payments --as=system:serviceaccount:payments:reporterThe command asks the authorization layer through a SelfSubjectAccessReview. Impersonating another subject requires permission to impersonate that identity. If impersonation fails, that failure does not show that the target subject lacks the requested permission. Keep tests within the review plan and record the tested identity, namespace, resource, verb, and result.
kubectl auth can-i --list can help explore permissions, but it is one validation view, not a substitute for resolving bindings, role rules, and scope.
6. Use audit records as operational context
Kubernetes auditing records security-relevant events in chronological form. If records are available, use them to see which actions occurred during the period reviewed and to inform conversations with workload owners. The API server can be configured with an audit policy file through --audit-policy-file; see the Kubernetes auditing documentation. No logged use during a selected period does not establish that a permission is safe to remove or never needed.
7. Record a finding and make the smallest safe change
For each concern, document the subject, binding, referenced role, scope, relevant rules, evidence, owner, and proposed change. Where the workload needs only namespace access, prefer a namespace-scoped grant over cluster-wide access; specify only the resources and verbs it requires. After changing access, validate both intended actions and important actions that should now be denied.
Use least privilege as a testable standard
The Kubernetes RBAC good-practices guide recommends specifying the resources and verbs a workload needs and assigning permissions at namespace scope where possible. Apply that guidance grant by grant: an access reduction is sound only when the workload’s required actions still succeed and the unwanted actions no longer do.
The Kubernetes documentation pages cited here were consulted on October 7, 2026. Check the documentation for your target Kubernetes release before relying on version-specific behavior or commands.
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