CVE-2026-89480High· 7.5▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: nvme-tcp: reject a read that transferred too few bytes nvme_tcp_recv_data() completes a request once the current C2HData PDU has been consumed. Nothing compares the to…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 7.4
none → high
— → 7.4
none → high
— → 7.5
none → high
7.5 → 7.4
7.4 → 7.5
7.5 → 7
0.2% → 0.6%
7 → 7.5
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
nvme-tcp: reject a read that transferred too few bytes
nvme_tcp_recv_data() completes a request once the current C2HData PDU has been consumed. Nothing compares the total bytes received against the length the command asked for: struct nvme_tcp_request has no receive-side counter, queue->data_remaining is per queue, and blk_mq_end_request() completes for blk_rq_bytes(rq) unconditionally with no residual concept anywhere above.
A controller can therefore answer a 4096-byte read with 512 bytes and have it reported as a complete read; user space then gets 4096 bytes of which 3584 are whatever was already in the page. I reproduced that with a test target.
Count the bytes received and refuse to complete a successful read whose count does not match, at the two NVME_TCP_F_DATA_SUCCESS paths and in nvme_tcp_process_nvme_cqe(). The success test shifts req->status right by one, because the driver keeps the wire value there and shifts it on completion, so the check must see what the completion path will see. Only REQ_OP_READ is checked, because there the length comes from the sectors the request covers; a passthrough command is built by its submitter, which picks both command and buffer, so the kernel has nothing to compare against.
Linux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < a5c1bb0fb1bab2f24a081339c145870697f6d220Linux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < aa107e3a68f4af177d60f2d87679e7f67179a36cLinux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < fca3ebb63e5c82561cd9934365dcc0d068008006Linux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < 99066cf9bba175f610ceb61a35f6fc9fbc33ff65Linux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < 8a02ad98798fd01f51f648c1fdd8f3c9d07195d3Linux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < 832a685efeb5d925ee7d30011d2dbe45f81447a3Linux >= 3f2304f8c6d6ed97849057bd16fee99e434ca796 < 7fa3f73f6c8ddc5f0425b50fb2a626a782ef7d12Linux 5.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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