CVE-2025-68266 (GCVE-0-2025-68266)
Vulnerability from cvelistv5
Published
2025-12-16 14:47
Modified
2025-12-16 14:47
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
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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          "programFiles": [
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          "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)."
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      "providerMetadata": {
        "dateUpdated": "2025-12-16T14:47:06.240Z",
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        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/34ab4c75588c07cca12884f2bf6b0347c7a13872"
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      "title": "bfs: Reconstruct file type when loading from disk",
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    "cveId": "CVE-2025-68266",
    "datePublished": "2025-12-16T14:47:06.240Z",
    "dateReserved": "2025-12-16T13:41:40.268Z",
    "dateUpdated": "2025-12-16T14:47:06.240Z",
    "state": "PUBLISHED"
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  }
}


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