# AU-09 Protection of Audit Information — NIST 800-53 Rev5 control

> FedRAMP Consolidated Rules for 2026 v2026.07.14.01 · updated 2026-07-14
> Canonical page: /control/au-9

Canonical id: `au-9` · family `AU`

> a. Protect audit information and audit logging tools from unauthorized access, modification, and deletion; and b. Alert [personnel or roles] upon detection of unauthorized access, modification, or deletion of audit information.

_Control title and statement: NIST SP 800-53 Rev5 catalog (the pinned commit is in `/api` under `control_text`). The FedRAMP rules reference these controls by id only; everything below is what FedRAMP says about this id._

## Rev5 baseline membership

- certification class B
- certification class C
- certification class D

## Key Security Indicators that reach it

- `KSI-MLA-OSM` — Operating SIEM Capability (Monitoring, Logging, and Auditing)
  A Security Information and Event Management (SIEM) or similar system(s) is used and persistently reviewed for centralized, tamper-resistant logging of events, activities, and changes.

## FedRAMP guidance

_No FedRAMP-specific guidance attaches to this control._