CVE-2026-46043

In the Linux kernel, the following vulnerability has been resolved:

RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv

rxe_rcv() currently checks only that the incoming packet is at least

header_size(pkt) bytes long before payload_size() is used.

However, payload_size() subtracts both the attacker-controlled BTH pad

field and RXE_ICRC_SIZE from pkt->paylen:

payload_size = pkt->paylen - offset[RXE_PAYLOAD] - bth_pad(pkt)

- RXE_ICRC_SIZE

This means a short packet can still make payload_size() underflow even

if it includes enough bytes for the fixed headers. Simply requiring

header_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a

packet with a forged non-zero BTH pad can still leave payload_size()

negative and pass an underflowed value to later receive-path users.

Fix this by validating pkt->paylen against the full minimum length

required by payload_size(): header_size(pkt) + bth_pad(pkt) +

RXE_ICRC_SIZE.