Proxmox VE 9.1 -- OCI Containers, TPM Snapshots & More

On November 19, 2025, Proxmox Server Solutions released the new Proxmox VE 9.1. The version brings numerous improvements for virtualization, container management, and high availability — based on Debian Trixie 13.2 and Linux Kernel 6.17.2-1. In addition to technical refinements, many features from the community have been integrated.

Technical Foundation

• Debian Trixie 13.2 as the new foundation

• Kernel 6.17.2-1 as the stable default

• QEMU 10.1.2, LXC 6.0.5, ZFS 2.3.4, Ceph Squid 19.2.3

This means Proxmox relies on a modern and secure platform with long-term compatibility and better hardware support.

Highlights at a Glance

1. LXC Containers from OCI Images

Proxmox VE 9.1 enables the creation of containers from Open Container Initiative (OCI) images for the first time — the same format used by Docker or Podman. Administrators can upload OCI images directly or load them from registries to create complete system or application containers.

Advantage:

Unified container provisioning across system boundaries. Initial support for Application Containers (Technology Preview).

2. Support for TPM State in qcow2

Virtual machines with Trusted Platform Module (TPM) — e.g., Windows 11 guests — can now store their state in qcow2 format. This enables snapshots on file-based storage (NFS, CIFS), including offline snapshots with active TPM state.

This brings:

• Snapshot compatibility with TPM VMs

• Flexible migration between hosts

• Improved security and backups

3. Fine-Grained Control of Nested Virtualization

A new vCPU flag nested-virt allows enabling nested virtualization selectively for individual VMs — without passing through the entire host vCPU type. This way, admins can safely test e.g., nested hypervisors or Windows VBS features.

4. Improved SDN Status Display in the GUI

The Software-Defined Networking management now provides detailed live status reports:

• Active connections on bridges & VNets

• Learned IP/MAC mapping in EVPN zones

• Routes, neighbors, and interfaces in fabrics

5. Web GUI & Mobile Interface

Proxmox VE 9.1 also improves the user experience:

• Bulk actions directly from the Tag View

• Improved mobile GUI with OIDC login

• Pending changes visible in VM options

• Faster rendering with many guests

• Better translations (including German, French, Korean, Polish)

Additional Improvements

Area	Improvement
QEMU / KVM	Support for Intel TDX (Confidential Computing), per-VM KSM deactivation, updated EFI keys for Secure Boot
LXC	Customizable environment variables, host DHCP management for app containers, optimized compatibility with Debian 13, Ubuntu 26.04, AlmaLinux 10
Backup/Storage	Improved snapshot management (“Volume Chains”), more stable LVM and Ceph integration
HA/Cluster	Faster calculation for CRS scheduler, more flexible resource rules, improved GUI operation
Firewall/SDN	More stable nftables integration, better documentation & status reports
Installer	Interface name pinning to prevent network outages during kernel updates

Known Issues & Notes

• NVIDIA vGPU: No compatibility with Kernel 6.17 yet -> pinning Kernel 6.14 is recommended

• Dell PowerEdge: Possible boot errors with Kernel 6.17

• LINSTOR/DRBD: Module currently not compatible with Kernel 6.17

Workaround: Install Kernel 6.14 and pin it with proxmox-boot-tool kernel pin

Conclusion

Proxmox VE 9.1 is a solid update focused on stability, security, and modernization. With OCI container support, TPM snapshots, and granular nested virtualization, Proxmox strengthens its position as the leading open-source virtualization platform — for private clouds, cluster environments, and enterprise data centers.

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Experience Proxmox 9.1 live. Our DATAZONE experts support you with upgrades, migration, and cluster design. Get started now with Proxmox VE 9.1 — powerful, secure, open.

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