{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "b8103265ec63fa87ac264c62bb796dbc38376652"
            },
            {
              "fixed": "fde790d8ea41283606d1c56b557608a17e455f59"
            }
          ],
          "repo": "https://github.com/winfsp/winfsp",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93689.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "last_affected": "2.2.26215"
          }
        ],
        "source": "AFFECTED_FIELD"
      },
      {
        "extracted_events": [
          {
            "fixed": "2.2.26215"
          }
        ],
        "source": "DESCRIPTION"
      }
    ]
  },
  "details": "WinFsp through 2.2.26215 contains a null pointer dereference vulnerability in the kernel driver's Fast I/O device control handler that fails to validate the volume context before use. An unprivileged local user can trigger a denial of service by opening the WinFsp control device and issuing FSP_IOCTL_TRANSACT requests, causing a system crash.",
  "id": "CVE-2026-93689",
  "modified": "2026-09-24T03:30:45.951214114Z",
  "published": "2026-09-18T15:06:04.237Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93689.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/winfsp/winfsp/releases/tag/v2.2B4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93689"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/winfsp-through-2.2.26215-null-pointer-dereference-via-fast-i-o"
    },
    {
      "type": "FIX",
      "url": "https://github.com/winfsp/winfsp/commit/b8103265ec63fa87ac264c62bb796dbc38376652"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/winfsp/winfsp"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L105-L114"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L146-L152"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L68-L73"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/volume.c#L1059-L1060"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "WinFsp through 2.2.26215 NULL Pointer Dereference via Fast I/O"
}