/usr/src/xtables-addons-1.40/xt_fuzzy.Kconfig is in xtables-addons-dkms 1.40-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 | config NETFILTER_XT_MATCH_FUZZY
	tristate '"fuzzy" match support'
	depends on NETFILTER_XTABLES && NETFILTER_ADVANCED
	---help---
	This extension allows you to match on packets according to a fuzzy
	logic based law.
 |