Degraded: CAST AI node provisioning issues on AKS with Kubernetes 1.36

Update timeline

1. identified Jun 16, 2026, 11:14 AM UTC

   CAST AI node provisioning fails on AKS clusters running Kubernetes 1.36.0 or above. This is caused by Azure removing support for Ubuntu 22.04 (the OS currently used by CAST AI for AKS worker nodes) on Kubernetes 1.36+. Impact: Clusters upgraded to Kubernetes 1.36 on AKS will be unable to provision new nodes via CAST AI. Workaround: Do not upgrade AKS control plane to Kubernetes 1.36 until further notice. Next update: We are working on Ubuntu 24.04 support / temporary workaround and will provide an update once a fix is available.

2. monitoring Jun 16, 2026, 02:08 PM UTC

   We have identified a workaround which allows nodes to continue provisioning normally for the affected clusters. Node functionality is not impacted. If you have already upgraded to 1.36 and are experiencing provisioning failures, please reach out to support and we will assist in applying the workaround. A permanent fix with Ubuntu 24.04 support is in progress. We will notify you once available.

3. resolved Jun 16, 2026, 02:47 PM UTC

   We have implemented a workaround and successfully remediated all affected clusters. Node provisioning is now functioning normally, and node functionality is not impacted. If you are running Kubernetes 1.36 and experience any node provisioning issues, please contact Support and we will be happy to assist. For any further questions, please reach out to Support or your Technical Account Manager.