CVE-2025-68266 (GCVE-0-2025-68266)

Vulnerability from cvelistv5 – Published: 2025-12-16 14:47 – Updated: 2026-01-19 12:18
VLAI?
Title
bfs: Reconstruct file type when loading from disk
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).
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d0c5ec1f57d8fbb953f166a27d9d32473dc8f3e4 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < aeccd6743ee4fdd1ab8cfcbb5b9a20b613418f6d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8f73336b75bd3457b6f9410f2a0601a238f32238 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a9f626396bfe66f49b743601e862767928237cc0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 77899444d46162aeb65f229590c26ba266864223 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a8cb796e7e2cb7971311ba236922f5e7e1be77e6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 34ab4c75588c07cca12884f2bf6b0347c7a13872 (git)
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    Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.62 , ≤ 6.12.* (semver)
Unaffected: 6.17.12 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "fs/bfs/inode.c"
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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)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-19T12:18:15.201Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "dateReserved": "2025-12-16T13:41:40.268Z",
    "dateUpdated": "2026-01-19T12:18:15.201Z",
    "state": "PUBLISHED"
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}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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