fkie_cve-2025-68266
Vulnerability from fkie_nvd
Published
2025-12-16 15:15
Modified
2025-12-18 15:08
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bfs: Reconstruct file type when loading from disk syzbot is reporting that S_IFMT bits of inode->i_mode can become bogus when the S_IFMT bits of the 32bits "mode" field loaded from disk are corrupted or when the 32bits "attributes" field loaded from disk are corrupted. A documentation says that BFS uses only lower 9 bits of the "mode" field. But I can't find an explicit explanation that the unused upper 23 bits (especially, the S_IFMT bits) are initialized with 0. Therefore, ignore the S_IFMT bits of the "mode" field loaded from disk. Also, verify that the value of the "attributes" field loaded from disk is either BFS_VREG or BFS_VDIR (because BFS supports only regular files and the root directory).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/34ab4c75588c07cca12884f2bf6b0347c7a13872
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/77899444d46162aeb65f229590c26ba266864223
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a8cb796e7e2cb7971311ba236922f5e7e1be77e6
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbfs: Reconstruct file type when loading from disk\n\nsyzbot is reporting that S_IFMT bits of inode-\u003ei_mode can become bogus when\nthe S_IFMT bits of the 32bits \"mode\" field loaded from disk are corrupted\nor when the 32bits \"attributes\" field loaded from disk are corrupted.\n\nA documentation says that BFS uses only lower 9 bits of the \"mode\" field.\nBut I can\u0027t find an explicit explanation that the unused upper 23 bits\n(especially, the S_IFMT bits) are initialized with 0.\n\nTherefore, ignore the S_IFMT bits of the \"mode\" field loaded from disk.\nAlso, verify that the value of the \"attributes\" field loaded from disk is\neither BFS_VREG or BFS_VDIR (because BFS supports only regular files and\nthe root directory)."
    }
  ],
  "id": "CVE-2025-68266",
  "lastModified": "2025-12-18T15:08:06.237",
  "metrics": {},
  "published": "2025-12-16T15:15:56.140",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/34ab4c75588c07cca12884f2bf6b0347c7a13872"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/77899444d46162aeb65f229590c26ba266864223"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a8cb796e7e2cb7971311ba236922f5e7e1be77e6"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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