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https://www.theregister.com/2023/04/04/siri_alexa_cortana_google_nuit/

NUIT, for Near-Ultrasound Inaudible Trojan, that exploits vulnerabilities in smart device microphones and voice assistants to silently and remotely access smart phones and home devices... millions of other devices, from laptops to speakers, lights, garage door openers and front door locks, could be remotely hijacked, using carefully crafted near-ultrasonic sounds.

more also on flingup about ultrasound usage, in comments:
https://flingup.com/thing/14525

https://www.theregister.com/2009/08/07/man_blames_cat/

I know, it's an old article, but I'd never seen it. People usually blame the dog when they fart. This guy takes lack of accountability to another level.