CVE-2026-89975 (GCVE-0-2026-89975)
Vulnerability from cvelistv5
Published
2026-09-16 10:32
Modified
2026-10-21 12:49
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nvme-fabrics: fix DHCHAP secret leak on parse failure nvmf_parse_options() duplicates dhchap_secret and dhchap_ctrl_secret with match_strdup() before validating the DHHC-1: representation. If validation fails, the parser returns -EINVAL before the temporary string in p is assigned to opts->dhchap_secret or opts->dhchap_ctrl_secret. nvmf_create_ctrl() subsequently frees opts, but nvmf_free_options() cannot release the unassigned temporary string. Each rejected option therefore leaks one allocation. This is easy to miss because valid secrets transfer ownership to opts and are freed normally, while the malformed-secret path still returns the expected -EINVAL to userspace. With CONFIG_NVME_HOST_AUTH enabled, the leak is reachable before the required-option checks and transport lookup. No NVMe-oF target or working transport connection is required; for example, repeatedly writing dhchap_secret=BAD or dhchap_ctrl_secret=BAD to /dev/nvme-fabrics deterministically takes the leaking parse path. Free the temporary string before leaving both validation error paths. Use kfree_sensitive() because the copied option may contain secret material even when its representation is rejected, matching the sensitive cleanup used for stored DHCHAP secrets.
References
Impacted products
Vendor Product Version
Linux Linux Version: f50fff73d620cd6e8f48bc58d4f1c944615a3fea
Version: f50fff73d620cd6e8f48bc58d4f1c944615a3fea
Version: f50fff73d620cd6e8f48bc58d4f1c944615a3fea
Version: f50fff73d620cd6e8f48bc58d4f1c944615a3fea
Version: f50fff73d620cd6e8f48bc58d4f1c944615a3fea
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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/fabrics.c"
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              "version": "7.2.5",
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-fabrics: fix DHCHAP secret leak on parse failure\n\nnvmf_parse_options() duplicates dhchap_secret and dhchap_ctrl_secret\nwith match_strdup() before validating the DHHC-1: representation.\n\nIf validation fails, the parser returns -EINVAL before the temporary\nstring in p is assigned to opts-\u003edhchap_secret or\nopts-\u003edhchap_ctrl_secret. nvmf_create_ctrl() subsequently frees opts,\nbut nvmf_free_options() cannot release the unassigned temporary string.\nEach rejected option therefore leaks one allocation.\n\nThis is easy to miss because valid secrets transfer ownership to opts\nand are freed normally, while the malformed-secret path still returns\nthe expected -EINVAL to userspace.\n\nWith CONFIG_NVME_HOST_AUTH enabled, the leak is reachable before the\nrequired-option checks and transport lookup. No NVMe-oF target or\nworking transport connection is required; for example, repeatedly\nwriting\n\n\tdhchap_secret=BAD\n\nor\n\n\tdhchap_ctrl_secret=BAD\n\nto /dev/nvme-fabrics deterministically takes the leaking parse path.\n\nFree the temporary string before leaving both validation error paths.\nUse kfree_sensitive() because the copied option may contain secret\nmaterial even when its representation is rejected, matching the\nsensitive cleanup used for stored DHCHAP secrets."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:49:18.356Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3ce0e9b43f355dfa0bdc0e0dd889795752285791"
        },
        {
          "url": "https://git.kernel.org/stable/c/702c1ae0d31b44828ec3c87079def490c1ee1fb3"
        },
        {
          "url": "https://git.kernel.org/stable/c/15d7a35a489287109b5a7c157d53d9b8214f0318"
        },
        {
          "url": "https://git.kernel.org/stable/c/d21da6cc91ba1c4f1ae5ba007f3cb89e1c0c7549"
        },
        {
          "url": "https://git.kernel.org/stable/c/afdee49a1b88ed9bb44e2b30e855297c169bcc53"
        }
      ],
      "title": "nvme-fabrics: fix DHCHAP secret leak on parse failure",
      "x_generator": {
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89975",
    "datePublished": "2026-09-16T10:32:53.836Z",
    "dateReserved": "2026-09-11T19:38:34.779Z",
    "dateUpdated": "2026-10-21T12:49:18.356Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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