03.08.04 Media Marking
What the standard requires
Mark system media that contain CUI to indicate distribution limitations, handling caveats, and applicable CUI markings.
Quoted verbatim from NIST SP 800-171 Rev 3, which is in the public domain.
Cross-framework mappings
No cross-framework mapping is seeded for this control. That is stated rather than filled in: a mapping nobody authored is worse than a gap you can see.
Track 03.08.04 with evidence behind it
In CMDash this control is a row with an owner, a status, uploaded evidence kept with its full history, and an export an assessor can read.