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CVE-2026-22998 is a denial-of-service vulnerability in the Linux kernel NVMe/TCP target implementation. The flaw is in the handling of host-to-controller data PDUs, where earlier hardening in nvmet_tcp_handle_h2c_data_pdu() added transfer tag bounds checking and data_offset validation but did not verify that the command data structures backing the request had been initialized before further processing. As a result, nvmet_tcp_build_pdu_iovec() could dereference cmd->req.sg and cmd->iov without confirming they were valid. The issue can be triggered by sending H2C_DATA PDUs out of protocol order, including immediately after the ICREQ/ICRESP handshake before a CONNECT command or before an NVMe write command, as well as by targeting READ commands or uninitialized command slots where one or both pointers remain NULL. The fix adds explicit validation of both cmd->req.sg and cmd->iov before calling nvmet_tcp_build_pdu_iovec().
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A Linux kernel nvme-tcp vulnerability involving NULL pointer dereferences in nvmet_tcp_build_pdu_iovec.
A Linux kernel vulnerability in nvme-tcp involving NULL pointer dereferences in nvmet_tcp_build_pdu_iovec.
A Linux kernel nvme-tcp vulnerability involving NULL pointer dereferences in nvmet_tcp_build_pdu_iovec.
A Linux kernel nvme-tcp vulnerability causing NULL pointer dereferences in nvmet_tcp_build_pdu_iovec, triggerable by malformed or out-of-sequence H2C_DATA PDUs before required command/data structures are initialized, leading to kernel panic or denial of service.
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Cross-references every affected SKU, including bundled OEM variants.
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