CVE-2026-89480nvme-tcp: reject a read that transferred too few bytes
- 7.5HighCVSS base score
- 0.43%Exploitation in 30 daysEPSS · top 63% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 49 days later
· 49 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVDNVD · Received | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.43% · top 63% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 – < b674af31d044a86bd094ba8bb8f2bb92fb49aac5
- affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 – < a5c1bb0fb1bab2f24a081339c145870697f6d220
- affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 – < aa107e3a68f4af177d60f2d87679e7f67179a36c
- affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 – < fca3ebb63e5c82561cd9934365dcc0d068008006
- affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 – < 99066cf9bba175f610ceb61a35f6fc9fbc33ff65
- affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 – < 8a02ad98798fd01f51f648c1fdd8f3c9d07195d3
- affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 – < 832a685efeb5d925ee7d30011d2dbe45f81447a3
- affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 – < 7fa3f73f6c8ddc5f0425b50fb2a626a782ef7d12
- affected 5.0
- unaffected < 5.0
- unaffected 5.10.273 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/b674af31d044a86bd094ba8bb8f2bb92fb49aac5 (opens in a new tab)
- https://git.kernel.org/stable/c/a5c1bb0fb1bab2f24a081339c145870697f6d220 (opens in a new tab)
- https://git.kernel.org/stable/c/aa107e3a68f4af177d60f2d87679e7f67179a36c (opens in a new tab)
- https://git.kernel.org/stable/c/fca3ebb63e5c82561cd9934365dcc0d068008006 (opens in a new tab)
- https://git.kernel.org/stable/c/99066cf9bba175f610ceb61a35f6fc9fbc33ff65 (opens in a new tab)
- https://git.kernel.org/stable/c/8a02ad98798fd01f51f648c1fdd8f3c9d07195d3 (opens in a new tab)
- https://git.kernel.org/stable/c/832a685efeb5d925ee7d30011d2dbe45f81447a3 (opens in a new tab)
- https://git.kernel.org/stable/c/7fa3f73f6c8ddc5f0425b50fb2a626a782ef7d12 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76386 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89480)Record last updated .