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FKIE_CVE-2026-89480

Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-09-14 13:19
Summary
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.
Impacted products
Vendor Product Version

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a5c1bb0fb1bab2f24a081339c145870697f6d220",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "aa107e3a68f4af177d60f2d87679e7f67179a36c",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "fca3ebb63e5c82561cd9934365dcc0d068008006",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "99066cf9bba175f610ceb61a35f6fc9fbc33ff65",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "8a02ad98798fd01f51f648c1fdd8f3c9d07195d3",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "832a685efeb5d925ee7d30011d2dbe45f81447a3",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "7fa3f73f6c8ddc5f0425b50fb2a626a782ef7d12",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "lessThan": "5.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: reject a read that transferred too few bytes\n\nnvme_tcp_recv_data() completes a request once the current C2HData PDU\nhas been consumed. Nothing compares the total bytes received against\nthe length the command asked for: struct nvme_tcp_request has no\nreceive-side counter, queue-\u003edata_remaining is per queue, and\nblk_mq_end_request() completes for blk_rq_bytes(rq) unconditionally\nwith no residual concept anywhere above.\n\nA controller can therefore answer a 4096-byte read with 512 bytes and\nhave it reported as a complete read; user space then gets 4096 bytes of\nwhich 3584 are whatever was already in the page. I reproduced that with\na test target.\n\nCount the bytes received and refuse to complete a successful read whose\ncount does not match, at the two NVME_TCP_F_DATA_SUCCESS paths and in\nnvme_tcp_process_nvme_cqe(). The success test shifts req-\u003estatus right\nby one, because the driver keeps the wire value there and shifts it on\ncompletion, so the check must see what the completion path will see.\nOnly REQ_OP_READ is checked, because there the length comes from the\nsectors the request covers; a passthrough command is built by its\nsubmitter, which picks both command and buffer, so the kernel has\nnothing to compare against."
    }
  ],
  "id": "CVE-2026-89480",
  "lastModified": "2026-09-14T13:19:04.623",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-11T20:19:29.470",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7fa3f73f6c8ddc5f0425b50fb2a626a782ef7d12"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/832a685efeb5d925ee7d30011d2dbe45f81447a3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8a02ad98798fd01f51f648c1fdd8f3c9d07195d3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/99066cf9bba175f610ceb61a35f6fc9fbc33ff65"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a5c1bb0fb1bab2f24a081339c145870697f6d220"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aa107e3a68f4af177d60f2d87679e7f67179a36c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fca3ebb63e5c82561cd9934365dcc0d068008006"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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