The canbus filesystem in the Linux kernel contains an information leak of kernel memory to devices on the CAN bus network link layer. An attacker with the ability to dump messages on the CAN bus is able to learn of uninitialized stack values by dumbing messages on the can bus.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1972267]
This was fixed for Fedora with the 5.12.13 stable kernel updates.