CVE-2026-52989

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

nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers

Currently, when nvmet_tcp_build_pdu_iovec() detects an out-of-bounds

PDU length or offset, it triggers nvmet_tcp_fatal_error(cmd->queue)

and returns early. However, because the function returns void, the

callers are entirely unaware that a fatal error has occurred and

that the cmd->recv_msg.msg_iter was left uninitialized.

Callers such as nvmet_tcp_handle_h2c_data_pdu() proceed to blindly

overwrite the queue state with queue->rcv_state = NVMET_TCP_RECV_DATA

Consequently, the socket receiving loop may attempt to read incoming

network data into the uninitialized iterator.

Fix this by shifting the error handling responsibility to the callers.