{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444"
            },
            {
              "fixed": "d493cf57f4c4dae5396cd6ad41e5c209d0615a81"
            },
            {
              "fixed": "c1ae0f973bcba5730871e35976a0ab6878fdac34"
            },
            {
              "fixed": "11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca"
            },
            {
              "fixed": "6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.12.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89683.json"
  },
  "details": "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's fsid\ntriggers the leak on every request.",
  "id": "CVE-2026-89683",
  "modified": "2026-09-13T03:30:58.929191985Z",
  "published": "2026-09-11T19:46:05.635Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89683.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89683"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "nfsd: fix dentry ref leak on V4ROOT export filehandle lookup"
}