In the Linux kernel, the following vulnerability has been resolved:
fou: remove warn in guegroreceive on unsupported protocol
Drop the WARNONONCE inn guegroreceive if the encapsulated type is not known or does not have a GRO handler.
Such a packet is easily constructed. Syzbot generates them and sets off this warning.
Remove the warning as it is expected and not actionable.
The warning was previously reduced from WARNON to WARNONONCE in commit 270136613bf7 ("fou: Do WARNONONCE in guegro_receive for bad proto callbacks").