nfsd: fix possible badness in FREE_STATEID

{
  "id": "58e1b5928863fbfa91803d4749eefe548cd7f00ab731f723962d4782edfdacce",
  "url": "https://osv.dev/vulnerability/CVE-2024-50043",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nfsd: fix possible badness in FREE_STATEID",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: nfsd: fix possible badness in FREE_STATEID When multiple FREE_STATEIDs are sent for the same delegation stateid, it can lead to a possible either use-after-free or counter refcount underflow errors. In nfsd4_free_stateid() under the client lock we find a delegation stateid, however the code drops the lock before calling nfs4_put_stid(), that allows another FREE_STATE to find the stateid again. The first one will proceed to then free the stateid which leads to either use-after-free or decrementing already zeroed counter.",
    "evidence": "osv:CVE-2024-50043",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.11.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2024-50043",
      "aliases": [
        "CVE-2024-50043"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3f29cc82a84c23cfd12b903029dd26002ca825f5"
                },
                {
                  "fixed": "7ca9e472ce5c67daa3188a348ece8c02a0765039"
                },
                {
                  "fixed": "c88c150a467fcb670a1608e2272beeee3e86df6e"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6.6.160"
                },
                {
                  "fixed": "6.7"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "172d038b7c4d3cfa9fc5ac210577c5c4f8256320"
                }
              ]
            }
          ],
          "versions": [
            "v6.6.160"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50043.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.9.0"
                },
                {
                  "fixed": "6.11.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50043.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.376725761Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/7ca9e472ce5c67daa3188a348ece8c02a0765039",
        "https://git.kernel.org/stable/c/c88c150a467fcb670a1608e2272beeee3e86df6e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50043.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-50043",
        "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/2024/50xxx/CVE-2024-50043.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-50043",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487746,
  "published_at": "2024-10-21T19:39:41.758+00:00"
}