Galaxy S25

7 os upgrades and 7 years of support starting last februari. An exact end of life date will be announced at the end of those 7 years 

The S25 receives software updates for 7 years.
However, the release interval may change from monthly to quarterly after 4 years.

Samsung publicly lists until when devices receive updates. (Curiously, this is missing for the S25)

https://www.samsungknox.com/en/knox-platform/supported-devices

Information on the current release intervals and the fixed CVEs can be found here:
https://security.samsungmobile.com/workScope.smsb