/etc/modprobe.d/blacklist-rare-network.conf is in kmod 22-1ubuntu4.
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 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | # Many less commonly used network protocols have recently had various
# security flaws discovered. In an effort to reduce the scope of future
# vulnerability exploitations, they are being blacklisted here so that
# unprivileged users cannot use them by default. System owners can still
# either modify this file, or specifically modprobe any needed protocols.
# ax25
alias net-pf-3 off
# netrom
alias net-pf-6 off
# x25
alias net-pf-9 off
# rose
alias net-pf-11 off
# decnet
alias net-pf-12 off
# econet
alias net-pf-19 off
# rds
alias net-pf-21 off
# af_802154
alias net-pf-36 off
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