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Status / Maintenance / Security Measure – Disabling Nested Virtualization

Security Measure – Disabling Nested Virtualization

CompletedStart: 06.08.2026, 20:25 MESZPlanned end: 07.08.2026, 00:00 MESZ

Actually ended 06.08.2026, 21:26 MESZ

Due to a recently disclosed security vulnerability in Proxmox, we are unfortunately required to temporarily disable Nested Virtualization once again. This primarily affects newly deployed nodes. To apply this security measure, the affected nodes will require a one-time reboot. We expect approximately 10 minutes of downtime per node. We apologize for the short-notice interruption. This measure is necessary to protect both our infrastructure and all customer systems.

AffectedXeon SL ClusterXeon FC ClusterRyzen FC ClusterEPYC MC Cluster

Updates

  1. Completed

    All affected servers have been restarted successfully and are back online. A follow-up maintenance window is scheduled for tomorrow at 21:00. During this maintenance, we will update the kernel and evaluate how Nested Virtualization will be handled going forward. Further information will be provided once the maintenance has been completed.

    Posted 2 months ago · 06.08.2026, 21:26 MESZ · Administrator · latest

  2. Verifying

    All VMs are up again.

    Posted 2 months ago · 06.08.2026, 21:17 MESZ · Administrator

  3. In Progress

    ryzen1,2,3,4,5 are restarting

    Posted 2 months ago · 06.08.2026, 21:03 MESZ · Administrator

  4. In Progress

    All V-Dedicated-Nodes are restarting

    Posted 2 months ago · 06.08.2026, 20:50 MESZ · Administrator

  5. In Progress

    xeon02 (fc) is restarting

    Posted 2 months ago · 06.08.2026, 20:42 MESZ · Administrator

  6. In Progress

    xeon01 is already up again

    Posted 2 months ago · 06.08.2026, 20:42 MESZ · Administrator

  7. In Progress

    Maintenance is in progress.

    Posted 2 months ago · 06.08.2026, 20:26 MESZ

  8. Scheduled

    Due to a recently disclosed security vulnerability in Proxmox, we are unfortunately required to temporarily disable Nested Virtualization once again. This primarily affects newly deployed nodes. To apply this security measure, the affected nodes will require a one-time reboot. We expect approximately 10 minutes of downtime per node. We apologize for the short-notice interruption. This measure is necessary to protect both our infrastructure and all customer systems.

    Posted 2 months ago · 06.08.2026, 20:26 MESZ · Administrator