{
  "cveId": "CVE-2025-39793",
  "url": "https://patchblox.com/security/cve/CVE-2025-39793",
  "summary": "CVE-2025-39793 is fixed in linux on 1 platform by DEBIAN-CVE-2025-39793 (version 6.16.3-1), released September 12, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  io_uring/memmap: cast nr_pages to size_t before...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  io_uring/memmap: cast nr_pages to size_t before shifting  If the allocated size exceeds UINT_MAX, then it\u0027s necessary to cast the mr-\u003Enr_pages value to size_t to prevent it from overflowing. In practice this isn\u0027t much of a concern as the required memory size will have been validated upfront, and accounted to the user. And \u003E 4GB sizes will be necessary to make the lack of a cast a problem, which greatly exceeds normal user locked_vm settings that are generally in the kb to mb range. However, if root is used, then accounting isn\u0027t done, and then it\u0027s possible to hit this issue.",
  "published": "2025-09-12T16:15:33Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00154,
  "epssPercentile": 0.04587,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.16.3-1",
      "fix": "DEBIAN-CVE-2025-39793",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39793",
      "released": "2025-09-12T16:15:33Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}