CVE-2026-89683 (GCVE-0-2026-89683)
Vulnerability from cvelistv5
Published
2026-09-11 19:46
Modified
2026-10-19 08:50
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix dentry ref leak on V4ROOT export filehandle lookup nfsd_set_fh_dentry() leaks the dentry reference from exportfs_decode_fh_raw() when the NFS3_FHSIZE or NFS_FHSIZE switch cases detect NFSEXP_V4ROOT and goto out. The out: label calls exp_put() but never dput(dentry), and fhp->fh_dentry was never assigned so fh_put() cannot compensate. A crafted NFSv3 filehandle targeting a V4ROOT export's fsid triggers the leak on every request.
References
Impacted products
Vendor Product Version
Linux Linux Version: ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444
Version: ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444
Version: ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444
Version: ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfsfh.c"
          ],
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "version": "6.12"
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            {
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              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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                  "vulnerable": true
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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: fix dentry ref leak on V4ROOT export filehandle lookup\n\nnfsd_set_fh_dentry() leaks the dentry reference from\nexportfs_decode_fh_raw() when the NFS3_FHSIZE or NFS_FHSIZE\nswitch cases detect NFSEXP_V4ROOT and goto out. The out: label\ncalls exp_put() but never dput(dentry), and fhp-\u003efh_dentry was\nnever assigned so fh_put() cannot compensate.\n\nA crafted NFSv3 filehandle targeting a V4ROOT export\u0027s fsid\ntriggers the leak on every request."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:50:56.607Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81"
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          "url": "https://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34"
        },
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          "url": "https://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca"
        },
        {
          "url": "https://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a"
        }
      ],
      "title": "nfsd: fix dentry ref leak on V4ROOT export filehandle lookup",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89683",
    "datePublished": "2026-09-11T19:46:05.635Z",
    "dateReserved": "2026-09-11T19:38:34.748Z",
    "dateUpdated": "2026-10-19T08:50:56.607Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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