All roms contain a kernel, but only some contain a custom kernel that can be tweaked.
Sent From My HTC One (M7WLV) S-OFF Rooted
Hboot: 1.56.0000 (Unlocked)
Recovery: TWRP 2.6.3.4
Baseband: 1.13.41.0109_2
Kernel: ElementalX 13.5
PRL: 15287
Rom: Stock OTA 3.11.605.1

VZW HTC One Files - VZW1FILES.DYNDNS.ORG

HTC Incredible Files - DINC.DOES-IT.NET