CVE-2026-94290

Summary

A privilege escalation flaw in SUSE Rancher Fleet allows an ordinary user to associate a Fleet Cluster object with administrative kubeconfig secrets from the management cluster, causing the controller to execute privileged Fleet content on the management cluster under that user's authority.

Exploitability

Exploitation requires the attacker to have namespace-scoped permissions to create or modify Fleet Cluster objects and access to an administrative kubeconfig secret in the same namespace or a shared namespace; it is not trivial but feasible for compromised or low-privilege accounts with write access to Fleet resources.

Blast radius

Successful exploitation grants attackers full administrative control over the management cluster, enabling lateral movement, data exfiltration, and persistent compromise of the entire Rancher environment.

Detection

Monitor for Fleet Cluster objects referencing secrets outside their namespace or with cluster-admin-level credentials; inspect API server audit logs for 'fleet.cattle.io/cluster' resource updates that associate a Cluster with a secret not owned by the creating user or containing elevated RBAC bindings.

Prioritized remediation

Upgrade to SUSE Rancher Fleet 0.16.4, 0.15.9, 0.14.13, or 0.13.18 (or later) to apply the vendor-provided fix that restricts kubeconfig secret references.

Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.