Improper Authentication Affecting kubevirt-virtctl package, versions <1.6.3-150700.3.13.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.01% (1st percentile)

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  • Snyk IDSNYK-SLES157-KUBEVIRTVIRTCTL-14287422
  • published10 Dec 2025
  • disclosed9 Dec 2025

Introduced: 9 Dec 2025

NewCVE-2025-64432  (opens in a new tab)
CWE-287  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

Upgrade SLES:15.7 kubevirt-virtctl to version 1.6.3-150700.3.13.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kubevirt-virtctl package and not the kubevirt-virtctl package as distributed by SLES. See How to fix? for SLES:15.7 relevant fixed versions and status.

KubeVirt is a virtual machine management add-on for Kubernetes. Versions 1.5.3 and below, and 1.6.0 contained a flawed implementation of the Kubernetes aggregation layer's authentication flow which could enable bypass of RBAC controls. It was discovered that the virt-api component fails to correctly authenticate the client when receiving API requests over mTLS. In particular, it fails to validate the CN (Common Name) field in the received client TLS certificates against the set of allowed values defined in the extension-apiserver-authentication configmap. Failre to validate certain fields in the client TLS certificate may allow an attacker to bypass existing RBAC controls by directly communicating with the aggregated API server, impersonating the Kubernetes API server and its aggregator component. This issue is fixed in versions 1.5.3 and 1.6.1.

CVSS Base Scores

version 3.1