Replying to @DanielMicay and @marcan42
Pixel 6 used 5.10 LTS since it was latest at the time but they've published experimental 5.15 LTS support. Kernel itself is a GKI (cross-device) and out-of-tree modules are built against the stable ABI.
Latest Android 12 5.10 GKI is https://android.googlesource.com/kernel/common/+/refs/tags/ASB-2022-08-05_12-5.10… based on 5.10.117.