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CVE-2025-21927 is an out-of-bounds write vulnerability in the Linux kernel NVMe over TCP implementation. The nvme_tcp_recv_pdu() receive path did not validate the header-length field of an incoming NVMe/TCP PDU. When NVMe/TCP header digests are enabled, a target can provide an unexpected header length, causing nvme_tcp_verify_hdgst() to calculate and write a digest outside the allocated buffer. The upstream correction rejects PDUs with invalid header lengths before digest verification.
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A potential memory-corruption vulnerability in the Linux kernel NVMe over TCP receive-PDU processing function, nvme_tcp_recv_pdu().
A potential memory-corruption vulnerability in the Linux kernel NVMe-over-TCP nvme_tcp_recv_pdu() function, fixed by the Red Hat Enterprise Linux 9 kernel update.
A Linux kernel NVMe-over-TCP memory-corruption vulnerability caused by inadequate validation of an incoming PDU header length. With header digests enabled, a malicious NVMe/TCP target can send an invalid header length that causes out-of-bounds access and overwrite during header-digest verification.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
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