One appliance and crew from Newport Pagnell and one from Broughton attended.
Hedges and a field of grass were well alight when they arrived.
Thames Valley Fire Control took more than calls to the incident.
The firefighters used:
- Two hose reels
- One main jet
- A thermal imaging camera
The fire affected the field, a hedge, a fence and the motorway embankment. The area was around 100 metres by 40 metres.
Thames Valley Police was notified of the incident.