listmount: don't call path_put() under namespace semaphore

{
  "id": "57b6faf7ef499fd43aa6e85551b8ec16d0b2590259679e99102cfbdb1f72de60",
  "url": "https://osv.dev/vulnerability/CVE-2025-40203",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "listmount: don't call path_put() under namespace semaphore",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: listmount: don't call path_put() under namespace semaphore Massage listmount() and make sure we don't call path_put() under the namespace semaphore. If we put the last reference we're fscked.",
    "evidence": "osv:CVE-2025-40203",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.54",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.17.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-40203",
      "aliases": [
        "CVE-2025-40203"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/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": "b4c2bea8ceaa50cd42a8f73667389d801a3ecf2d"
                },
                {
                  "fixed": "659874b7ee4976ad9ce476e07fd36bc67b3537f1"
                },
                {
                  "fixed": "9c80da26fda2fdcaac7f92b5908875b3108830ff"
                },
                {
                  "fixed": "c1f86d0ac322c7e77f6f8dbd216c65d39358ffc0"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40203.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.8.0"
                },
                {
                  "fixed": "6.12.54"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.17.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40203.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.607488111Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/659874b7ee4976ad9ce476e07fd36bc67b3537f1",
        "https://git.kernel.org/stable/c/9c80da26fda2fdcaac7f92b5908875b3108830ff",
        "https://git.kernel.org/stable/c/c1f86d0ac322c7e77f6f8dbd216c65d39358ffc0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40203.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40203",
        "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/2025/40xxx/CVE-2025-40203.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-40203",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501042,
  "published_at": "2025-11-12T21:56:34.801+00:00"
}