CVE-2026-17527: Virt-cdi-operator: containerized-data-importer: cdi.kubevirt.io:view aggregated clusterrole grants create on datavolumes/source, allowing unauthorized pvc clone
CDI's aggregated read-only ClusterRole (cdi.kubevirt.io:view) explicitly grants create on the datavolumes/source subresource. CDI's clone authorization logic treats this permission alone as sufficient to authorize cloning any named PVC's data into a new DataVolume, regardless of whether the caller has any other access to that PVC or its namespace. Any principal bound to view (commonly done via ClusterRoleBinding, and unavoidable in practice since CDI ships this role labeled for aggregation into Kubernetes' built-in view role) who also holds ordinary write access (edit/admin) in any namespace can clone any PVC in the cluster, bypassing the read-only intent of view.
Other sources
In containerized-data-importer (CDI), the aggregated cdi.kubevirt.io:view ClusterRole, intended to provide read-only access to CDI resources, includes a rule granting create on the datavolumes/source subresource. CDI's DataVolume clone authorization accepts this permission as sufficient to authorize cloning the contents of any PVC the caller can name, without requiring write access to the source namespace. A user or service account bound to the view role, commonly granted cluster-wide via ClusterRoleBinding, who also has ordinary write access (edit/admin) to any single namespace, can use this to exfiltrate the contents of any PVC in the cluster into a namespace they control, bypassing namespace isolation and the read-only guarantee of the view role.
— MITRE
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-17527?
The severity of CVE-2026-17527 is rated high with a score of 7.7.
What is the risk associated with CVE-2026-17527?
CVE-2026-17527 carries a risk rating of 44.
How do I fix CVE-2026-17527?
To fix CVE-2026-17527, ensure that permissions are reviewed and modified to prevent unauthorized access for cloning PVC data.
What allows the exploitation of CVE-2026-17527?
CVE-2026-17527 can be exploited due to the aggregated ClusterRole granting create permission on the datavolumes/source subresource.
What impact does CVE-2026-17527 have on Kubevirt users?
CVE-2026-17527 allows unauthorized users to clone Persistent Volume Claims (PVCs), posing a significant security risk.