Should organisations use one inventory for containers and virtual machines?

Why one inventory is usually the better operating model

A single inventory works because the operational question is not whether a thing is a container or a virtual machine, it is whether the release, dependency and exposure picture is consistent enough to govern and respond to. When container images, VM filesystems and imported SBOMs are tracked separately, teams often end up with different completeness standards, different update cadences and different owners for the same underlying software release.

That split creates false confidence. The same application can be deployed as a container image in one environment and as a VM artifact in another, so a vulnerability response process that only sees one inventory will miss part of the blast radius. A unified model also makes it easier to link the software bill of materials, the runtime asset and the remediation workflow to the same release record.

For practitioners, the practical benefit is scoping speed. If the inventory can answer “where is this release running?” across both platforms, the security team can triage exposure once instead of reconciling parallel spreadsheets or tool views. A single record also makes accountability clearer because ownership, exception handling and remediation status attach to one asset view rather than two competing ones.

What a unified inventory has to capture

A usable inventory should treat the release as the primary object and then record the deployment forms beneath it. That means image digests, VM artifacts, package lineage, environment, owner, business service, exposure state and whether the record came from discovery, CI/CD, a registry, a CMDB or an SBOM import. The important point is not the catalog format, but that the asset can be traced from source to runtime without losing identity along the way.

A container image security guide is useful here because image scanning, signing and registry controls only become operationally meaningful when they feed the same inventory used for VM and release governance. Likewise, an inventory that is built only around infrastructure objects will usually miss the release-level relationship that makes cross-platform vulnerability response defensible.

This is also where lifecycle management thinking helps, even outside a pure identity discussion: the useful question is whether the asset can be discovered, owned, rotated, retired and audited through one lifecycle. If the same software release can appear in more than one runtime form, the inventory has to preserve that lineage rather than fragment it by platform.

How to avoid the common failure modes

The biggest mistake is to unify only the dashboard while leaving the workflows separate. If container findings land in one queue and VM findings in another, the organisation still has two response models, even if the front end looks consolidated. Another frequent failure is mixing asset records without preserving the deployment context, which makes it hard to tell whether a finding affects the image, the runtime host, or both.

NIST SP 800-190 Container Security is directly relevant because it treats image, registry, orchestrator and runtime risk as related parts of one security problem, which is exactly the posture you need when inventory decisions span containers and virtual machines. A second useful reference point is the CIS Controls v8, especially where asset inventory, account management and vulnerability management have to operate against the same source of truth.

The operational test is simple: if the team cannot answer whether a vulnerability belongs to a release, a running image, or a VM instance within the same workflow, the inventory is still too fragmented. That is usually where remediation slows down and governance becomes hard to defend.

Practitioner Guidance

What to prioritise: Build the inventory around the release and its lineage, not around the hosting model. That lets one record support both vulnerability triage and governance evidence when the same software appears in multiple runtime forms.

What to verify: Make sure every record can answer four questions quickly: what is it, where is it running, who owns it, and how does it connect back to the software release or SBOM. If any of those answers depends on a separate tool or a manual lookup, the operating model is still split.

Common mistake: Treating containers and virtual machines as separate governance domains just because the controls are applied in different tools. The control objective is the same, consistent visibility and defensible response, so the inventory design should reflect that.

Practitioner takeaway: One inventory is worth adopting when the same release can exist in multiple runtime forms, because the real security problem is lineage and accountability, not platform label.

Related resources from NHI Mgmt Group

• What should organisations do when they need to secure containers, virtual machines, and Kubernetes across public and private clouds?
• When do NHI access reviews create more value than a one-time cleanup?
• How do organisations operationalise NHI ownership at scale?
• How should security teams use IAST and RASP in NHI governance?