{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "36011308b3f01ce7dc9954f3cefcbb5291af9f95"
            },
            {
              "fixed": "888dad4b557352cf85be31613407b5ba51ad07d1"
            },
            {
              "fixed": "8661d3cb38fd148947e57dbc0871fd4d3fa33bbf"
            },
            {
              "fixed": "3ef5e7a01a4d74995a65496bc9166d1e980a4355"
            },
            {
              "fixed": "b24843ea3de1676b29902457b38507c95a80649b"
            },
            {
              "fixed": "895a485cd3758031ef9993c0d53cf19ce8fb4ccc"
            },
            {
              "fixed": "45ec115cbfecb4b3cfab7fca6f73d1b60696a25a"
            },
            {
              "fixed": "041f57056e5fb9c80adc088269322d2c61074406"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "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-2026-89699.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: validate symlink target length in NFSv4 CREATE\n\nnfsd4_decode_create() accepts an unbounded cr_datalen from the wire for\nNF4LNK symlink targets, allowing a client to force a kmalloc of up to\nthe maximum RPC payload size (several MiB) per COMPOUND op that persists\nuntil compound teardown.  The VFS rejects oversized targets with\nENAMETOOLONG, but the allocation has already occurred.\n\nReject cr_datalen == 0 early with nfserr_inval and cr_datalen greater\nthan NFS4_MAXPATHLEN (PATH_MAX) with nfserr_nametoolong to bound the\nallocation.",
  "id": "CVE-2026-89699",
  "modified": "2026-09-15T03:31:08.180116625Z",
  "published": "2026-09-11T19:46:17.293Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/041f57056e5fb9c80adc088269322d2c61074406"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36011308b3f01ce7dc9954f3cefcbb5291af9f95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ef5e7a01a4d74995a65496bc9166d1e980a4355"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45ec115cbfecb4b3cfab7fca6f73d1b60696a25a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8661d3cb38fd148947e57dbc0871fd4d3fa33bbf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/888dad4b557352cf85be31613407b5ba51ad07d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/895a485cd3758031ef9993c0d53cf19ce8fb4ccc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b24843ea3de1676b29902457b38507c95a80649b"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89699.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89699"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nfsd: validate symlink target length in NFSv4 CREATE"
}