NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL

{
  "id": "8b8868506859da3b261897cbea0b94813b00efce2e6be5d38a3b2b6964235c36",
  "url": "https://osv.dev/vulnerability/CVE-2023-53680",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL OPDESC() simply indexes into nfsd4_ops[] by the op's operation number, without range checking that value. It assumes callers are careful to avoid calling it with an out-of-bounds opnum value. nfsd4_decode_compound() is not so careful, and can invoke OPDESC() with opnum set to OP_ILLEGAL, which is 10044 -- well beyond the end of nfsd4_ops[].",
    "evidence": "osv:CVE-2023-53680",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.220",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.107",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.24",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-53680",
      "aliases": [
        "CVE-2023-53680"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8"
                },
                {
                  "fixed": "50827896c365e0f6c8b55ed56d444dafd87c92c5"
                },
                {
                  "fixed": "a64160124d5a078be0c380b1e8a0bad2d040d3a1"
                },
                {
                  "fixed": "ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e"
                },
                {
                  "fixed": "f352c41fa718482979e7e6b71b4da2b718e381cc"
                },
                {
                  "fixed": "804d8e0a6e54427268790472781e03bc243f4ee3"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53680.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.14.0"
                },
                {
                  "fixed": "5.10.220"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.107"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.24"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53680.json"
          }
        }
      ],
      "modified": "2026-10-30T02:30:42.740364755Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/50827896c365e0f6c8b55ed56d444dafd87c92c5",
        "https://git.kernel.org/stable/c/804d8e0a6e54427268790472781e03bc243f4ee3",
        "https://git.kernel.org/stable/c/a64160124d5a078be0c380b1e8a0bad2d040d3a1",
        "https://git.kernel.org/stable/c/f352c41fa718482979e7e6b71b4da2b718e381cc",
        "https://git.kernel.org/stable/c/ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53680.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53680",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53680.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53680",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494582,
  "published_at": "2025-10-07T15:21:34.626+00:00"
}