Bug 2458741 (CVE-2026-6383) - CVE-2026-6383 kubevirt: KubeVirt: Unauthorized subresource access due to improper RBAC evaluation
Summary: CVE-2026-6383 kubevirt: KubeVirt: Unauthorized subresource access due to impr...
Keywords:
Status: NEW
Alias: CVE-2026-6383
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-15 18:08 UTC by OSIDB Bzimport
Modified: 2026-04-15 18:15 UTC (History)
5 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-04-15 18:08:01 UTC
A flaw was found in KubeVirt's RBAC (Role-Based Access Control) evaluation logic. The authorization mechanism improperly truncates subresource names during evaluation. This causes requests for granular subresources, such as vnc/screenshot or sev/*, to be incorrectly evaluated against their parent resource permissions (e.g., vnc or sev). As a result, the RBAC engine fails to enforce the intended granular access controls. This can cause legitimate users to be denied access or allow authenticated users with specific custom roles to gain unauthorized access to subresources.


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