KubeVirt RBAC Truncation Authz Flaw Enables Unauthorized Subresource Access
CVE-2026-6383 Published on April 15, 2026
Kubevirt: kubevirt: unauthorized subresource access due to improper rbac evaluation
A flaw was found in KubeVirt's Role-Based Access Control (RBAC) evaluation logic. The authorization mechanism improperly truncates subresource names, leading to incorrect permission evaluations. This allows authenticated users with specific custom roles to gain unauthorized access to subresources, potentially disclosing sensitive information or performing actions they are not permitted to do. Additionally, legitimate users may be denied access to resources.
Vulnerability Analysis
CVE-2026-6383 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Timeline
Reported to Red Hat.
Made public.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-6383 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-6383
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