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.
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A critical vulnerability has been identified in the Linux kernel NVMe-over-TCP (nvmet-tcp) driver. Improper error handling allows network data to be read into uninitialized memory, which could lead to remote system compromise for servers using NVMe-over-Fabrics transport.
Relevant roles
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HEPSS
Technical description
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.
References
- https://git.kernel.org/stable/c/046fa5c72d15cd8e2d592e275697ea399d8f76b0
- https://git.kernel.org/stable/c/3df42a854686fa06484e37ac1a3931c8e3e3453c
- https://git.kernel.org/stable/c/c2a11441538bdbbc5aa003f190995eba93a89b88
- https://git.kernel.org/stable/c/d7c8f95f599b3b38a717d2e771c3f8c174f657c3
- https://git.kernel.org/stable/c/ea8e356acb165cb1fd75537a52e1f66e5e76c538
- https://git.kernel.org/stable/c/f9204a2b78dd18374d3bcf9bf93d9021ce22de1b