CVE-2025-21910 addresses a vulnerability in the Linux kernel's wifi regulatory subsystem where invalid regulatory hints containing non-latin alphabetic characters could bypass validation checks. This flaw arises because the existing checks use isalpha() and toupper() functions that accept and transform non-latin letters, which are not valid ISO-3166-1 alpha2 country codes. The issue could lead to kernel warnings and potentially impact system stability. The vulnerability has a medium severity score and does not affect confidentiality or integrity but impacts availability.