ghsa-53xm-w39p-m328
Vulnerability from github
Published
2025-09-12 18:31
Modified
2025-09-12 18:31
Details

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's necessary to cast the mr->nr_pages value to size_t to prevent it from overflowing. In practice this isn't much of a concern as the required memory size will have been validated upfront, and accounted to the user. And > 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't done, and then it's possible to hit this issue.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39793"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-12T16:15:33Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/memmap: cast nr_pages to size_t before shifting\n\nIf the allocated size exceeds UINT_MAX, then it\u0027s necessary to cast\nthe mr-\u003enr_pages value to size_t to prevent it from overflowing. In\npractice this isn\u0027t much of a concern as the required memory size will\nhave been validated upfront, and accounted to the user. And \u003e 4GB sizes\nwill be necessary to make the lack of a cast a problem, which greatly\nexceeds normal user locked_vm settings that are generally in the kb to\nmb range. However, if root is used, then accounting isn\u0027t done, and\nthen it\u0027s possible to hit this issue.",
  "id": "GHSA-53xm-w39p-m328",
  "modified": "2025-09-12T18:31:09Z",
  "published": "2025-09-12T18:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39793"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/33503c083fda048c77903460ac0429e1e2c0e341"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a69a9b53c54e2d33e2a5b1ea4a9a71fd01c6cf3a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c6a2706e08b8a1b2d3740161c0977d38e596c1ee"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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