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EUVD-2026-260470

fkie_cve-2025-64434

KubeVirt is a virtual machine management add-on for Kubernetes. Prior to 1.5.3 and 1.6.1, due to the peer verification logic in virt-handler (via verifyPeerCert), an attacker who compromises a virt-handler instance, could exploit these shared credentials to impersonate virt-api and execute privileged operations against other virt-handler instances potentially compromising the integrity and availability of the VM managed by it. This vulnerability is fixed in 1.5.3 and 1.6.1.

GHSA-ggp9-c99x-54gp — KubeVirt's Improper TLS Certificate Management Handling Allows API Identity Spoofing

Affected: Go: kubevirt.io/kubevirt

### Summary Due to improper TLS certificate management, a compromised `virt-handler` could impersonate `virt-api` by using its own TLS credentials, allowing it to initiate privileged operations against another `virt-handler`.

### Details _Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer._

Because of improper TLS certificate management, a compromised `virt-handler` instance can reuse its TLS bundle to impersonate `virt-api`, enabling unauthorized access to VM lifecycle operations on other `virt-handler` nodes. The `virt-api` component acts as a sub-resource server, and it proxies API VM lifecycle requests to `virt-handler` instances. The communication between `virt-api` and `virt-handler` instances is secured using mTLS. The former acts as a client while the latter as the server. The client certificate used by `virt-api` is defined in the source code as follows and have the following properties:

```go //pkg/virt-api/api.go

const ( ... defaultCAConfigMapName = "kubevirt-ca" ... defaultHandlerCertFilePath = "/etc/virt-handler/clientcertificates/tls.crt" defaultHandlerKeyFilePath = "/etc/virt-handler/clientcertificates/tls.key" ) ```

```bash # verify virt-api's certificate properties from the docker container in which it is deployed using Minikube admin@minikube:~$ openssl x509 -text -in \ $(CID=$(docker ps --filter 'Name=virt-api' --format '{{.ID}}' | head -n 1) && \ docker inspect $CID | grep…

msrc_CVE-2025-64434 — KubeVirt Improper TLS Certificate Management Handling Allows API Identity Spoofing

msrc_CVE-2025-64434

openSUSE-SU-2026:20281-1 — Security update for kubevirt

Security update for kubevirt

SUSE-SU-2026:20551-1 — Security update for kubevirt

Security update for kubevirt

WID-SEC-W-2025-2563 — Microsoft Azure Linux: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Azure Linux und Microsoft Windows ausnutzen um erhöhte Privilegien zu erlangen, beliebigen Code auszuführen, die Authentifizierung zu umgehen, Spoofing-Angriffe durchzuführen, einen Denial-of-Service-Zustand zu verursachen oder andere, nicht näher spezifizierte Angriffe durchzuführen.