CVE-2026-89701 (GCVE-0-2026-89701)
Vulnerability from cvelistv5
Published
2026-09-11 19:46
Modified
2026-10-19 08:51
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: validate nseconds in TIME_DELEG decode paths The xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms store a raw uint32_t nseconds directly into tv_nsec without enforcing nseconds < NSEC_PER_SEC. The legacy nfsd4_decode_nfstime4 has this check but the TIME_DELEG paths do not. A malformed timespec can propagate through notify_change() to disk. Add range checks in both nfs4xdr.c (SETATTR path) and nfs4callback.c (CB_GETATTR path).
References
Impacted products
Vendor Product Version
Linux Linux Version: 6ae30d6eb26bce02c48c60074b4306270e2434c1
Version: 6ae30d6eb26bce02c48c60074b4306270e2434c1
Version: 6ae30d6eb26bce02c48c60074b4306270e2434c1
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4callback.c",
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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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\nnfsd: validate nseconds in TIME_DELEG decode paths\n\nThe xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms\nstore a raw uint32_t nseconds directly into tv_nsec without enforcing\nnseconds \u003c NSEC_PER_SEC. The legacy nfsd4_decode_nfstime4 has this\ncheck but the TIME_DELEG paths do not. A malformed timespec can\npropagate through notify_change() to disk.\n\nAdd range checks in both nfs4xdr.c (SETATTR path) and\nnfs4callback.c (CB_GETATTR path)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:51:14.339Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/7e7b93da7fa2e77f977096251899d1410986adf6"
        },
        {
          "url": "https://git.kernel.org/stable/c/5eb489831a9fd4754f4baf26e6989efb66ce104c"
        },
        {
          "url": "https://git.kernel.org/stable/c/0f4a767340fad392bd656115b8752005518c9065"
        }
      ],
      "title": "nfsd: validate nseconds in TIME_DELEG decode paths",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89701",
    "datePublished": "2026-09-11T19:46:18.807Z",
    "dateReserved": "2026-09-11T19:38:34.750Z",
    "dateUpdated": "2026-10-19T08:51:14.339Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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