This file is indexed.

/lib/firmware/cis/src/NE2K.cis is in linux-firmware 1.173.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# Replacement CIS for various busted NE2000-compatible cards
#
vers_1 4.1, "PCMCIA", "Ethernet"
funcid network_adapter
config base 0x03f8 mask 0x03 last_index 0x20
cftable_entry 0x20 [default]
  Vcc Vnom 5V
  irq mask 0xffff [level]
  io 0x0000-0x001f [8bit] [16bit]