Anthos GKE - September 17th, 2021 [Security]

## Security A security issue was discovered in Kubernetes, [CVE-2021-25741](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25741), where a user may be able to create a container with subpath volume mounts to access files and directories outside of the volume, including on the host filesystem. For more information, see the [GCP-2021-018 security bulletin](https://cloud.google.com/anthos/clusters/docs/security-bulletins#gcp-2021-018).