bfs: Reconstruct file type when loading from disk
CVE-2025-68266 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-68266, released December 16, 2025. It is not reported as exploited. Patch Radar priority: High.
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).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 6.1.162-1 | DEBIAN-CVE-2025-68266 | Dec 16, 2025 |
| linux · Debian 13.5 (trixie) | 6.12.63-1 | DEBIAN-CVE-2025-68266 | Dec 16, 2025 |
| linux · Debian 14 | 6.17.12-1 | DEBIAN-CVE-2025-68266 | Dec 16, 2025 |
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