CrowdStrike has admitted to pushing out a bad software update, causing many Windows machines running the affected software to crash. The problem, apparently affecting its Falcon platform, brought down servers at airlines, locked up computers at banks, and hurt healthcare services.

“CrowdStrike is actively working with customers impacted by a defect found in a single content update for Windows hosts,” the company said Friday in a post to its blog titled “Statement on Windows Sensor Update.”

Mac and Linux versions of the software are unaffected, and the incident was not the result of a cyberattack, it said.