Received iCloud Keychain code via SMS without asking for it

Hi,

A few mins ago, I have received an SMS from AppleID saying that:

You iCloud Keychain verification code is: xxxxxx

But I didn't ask for any kind of verification or auth of a new device. Actually I was just walking home.

Is it possible that someone else is trying to access it? Or is it just a random love from iCloud?

(I have a MacBook Air, iPad and iPhone connected to the same iCloud account with recently enabled Keychain.)