Description
In the Linux kernel, the following vulnerability has been resolved:
nilfs2: fix shift-out-of-bounds due to too large exponent of block size
If field s_log_block_size of superblock data is corrupted and too large, init_nilfs() and load_nilfs() still can trigger a shift-out-of-bounds warning followed by a kernel panic (if panic_on_warn is set):
shift exponent 38973 is too large for 32-bit type 'int' Call Trace: <TASK> dump_stack_lvl+0xcd/0x134 ubsan_epilogue+0xb/0x50 __ubsan_handle_shift_out_of_bounds.cold.12+0x17b/0x1f5 init_nilfs.cold.11+0x18/0x1d [nilfs2] nilfs_mount+0x9b5/0x12b0 [nilfs2] ...
This fixes the issue by adding and using a new helper function for getting block size with sanity check.
Metrics
No CVSS score has been published yet.
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f, < ec93b5430ec0f60877a5388bb023d60624f9ab9f; >= 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f, < 8b6ef451b5701b37d9a5905534595776a662edfc; >= 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f, < ddb6615a168f97b91175e00eda4c644741cf531c; >= 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f, < a16731fa1b96226c75bbf18e73513b14fc318360; >= 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f, < ebeccaaef67a4895d2496ab8d9c2fb8d89201211 |
| Linux | Linux | 2.6.30 |
References
- https://git.kernel.org/stable/c/8b6ef451b5701b37d9a5905534595776a662edfc
- https://git.kernel.org/stable/c/a16731fa1b96226c75bbf18e73513b14fc318360
- https://git.kernel.org/stable/c/ddb6615a168f97b91175e00eda4c644741cf531c
- https://git.kernel.org/stable/c/ebeccaaef67a4895d2496ab8d9c2fb8d89201211
- https://git.kernel.org/stable/c/ec93b5430ec0f60877a5388bb023d60624f9ab9f
Timeline
- Published
- Dec 30, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Deferred