CVE-2025-68266
Description
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).
How to fix
- Linux Linuxd0c5ec1f57d8fbb953f166a27d9d32473dc8f3e4, aeccd6743ee4fdd1ab8cfcbb5b9a20b613418f6d, 8f73336b75bd3457b6f9410f2a0601a238f32238, a9f626396bfe66f49b743601e862767928237cc0, 77899444d46162aeb65f229590c26ba266864223, a8cb796e7e2cb7971311ba236922f5e7e1be77e6, 34ab4c75588c07cca12884f2bf6b0347c7a13872 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < d0c5ec1f57d8fbb953f166a27d9d32473dc8f3e4, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < aeccd6743ee4fdd1ab8cfcbb5b9a20b613418f6d, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 8f73336b75bd3457b6f9410f2a0601a238f32238, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < a9f626396bfe66f49b743601e862767928237cc0, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 77899444d46162aeb65f229590c26ba266864223, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < a8cb796e7e2cb7971311ba236922f5e7e1be77e6, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 34ab4c75588c07cca12884f2bf6b0347c7a13872, 2.6.12 | d0c5ec1f57d8fbb953f166a27d9d32473dc8f3e4, aeccd6743ee4fdd1ab8cfcbb5b9a20b613418f6d, 8f73336b75bd3457b6f9410f2a0601a238f32238, a9f626396bfe66f49b743601e862767928237cc0, 77899444d46162aeb65f229590c26ba266864223, a8cb796e7e2cb7971311ba236922f5e7e1be77e6, 34ab4c75588c07cca12884f2bf6b0347c7a13872 |
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