Verify Kernel DMA Protection on every high-risk endpoint

Frame this document as a source-led configuration and assurance check: Verify Kernel DMA Protection on every high-risk endpoint. Only the official source and traced locations below supply facts. Confirm applicability before acting.

Source fact:

The official Kernel DMA Protection from Microsoft supports the following bounded statements:

• Kernel DMA Protection prevents unauthorized memory access by external DMA-capable peripherals. The research record locates this support at Opening overview.
• Thunderbolt, USB4, and CFexpress devices can access memory without CPU involvement, creating drive-by DMA risk. The research record locates this support at Opening overview.

These statements are the factual basis for this document. Do not extend them into a broader assurance. Review Windows security controls, protected identities, audit policy, telemetry, exclusions, administrative roles, and response workflows only where the source and recorded environment align.

What the source does not establish

Verify hardware and firmware support; policy cannot create IOMMU protections absent from the platform. It does not establish a deployment’s current state, authorize a production change, prove compliance, or show that Active Directory, Windows DNS, certificate trust, time, endpoint management, telemetry pipelines, and security operations are healthy. Documented options are review inputs, not universal mandates.

Applicability questions

• For source statement 1 at Opening overview, which observable configuration, record, or test can confirm applicability here?
• For source statement 2 at Opening overview, which observable configuration, record, or test can confirm applicability here?
• Which deployed instance of Windows security controls, protected identities, audit policy, telemetry, exclusions, administrative roles, and response workflows will be compared with the source, and why that instance?
• How will the review distinguish a source mismatch from a failure in Active Directory, Windows DNS, certificate trust, time, endpoint management, telemetry pipelines, and security operations?
• Who approves the conclusion, exception, test window, and rollback threshold?

DSE recommendation:

DSE recommends using the cited source as the evidence anchor for this decision. Start with applicability, then compare the observed state with the cited source. Record the source location, examined part of Windows security controls, protected identities, audit policy, telemetry, exclusions, administrative roles, and response workflows, observed and expected states, owner, and reason for deviation.

Translate the conclusion into change control only after documenting dependencies, impact, test method, expected signals, failure signals, and restoration steps. Include Active Directory, Windows DNS, certificate trust, time, endpoint management, telemetry pipelines, and security operations, while excluding secrets and sensitive personal or topology data from ordinary tickets.

Verification and evidence

Keep the source locations Opening overview; Opening overview adjacent to the sanitized artifacts used for comparison. Prefer policy and feature state, security events, test detections, administrative assignments, exception approvals, and response tickets, with enough identity and timing data for an independent recheck.

Record the decision even when no change is made, including uncertainty and the next trigger. Use safe testing conditions for disruptive work, preserve rollback proof, and revisit the conclusion after relevant platform, dependency, vendor, or ownership changes.

Official references

• Kernel DMA Protection — Microsoft