CVE-2025-40106
Description
In the Linux kernel, the following vulnerability has been resolved: comedi: fix divide-by-zero in comedi_buf_munge() The comedi_buf_munge() function performs a modulo operation `async->munge_chan %= async->cmd.chanlist_len` without first checking if chanlist_len is zero. If a user program submits a command with chanlist_len set to zero, this causes a divide-by-zero error when the device processes data in the interrupt handler path. Add a check for zero chanlist_len at the beginning of the function, similar to the existing checks for !map and CMDF_RAWDATA flag. When chanlist_len is zero, update munge_count and return early, indicating the data was handled without munging. This prevents potential kernel panics from malformed user commands.
How to fix
- Linux Linux4ffea48c69cb2b96a281cb7e5e42d706996631db, 8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c, 2670932f2465793fea1ef073e40883e8390fa4d9, 6db19822512396be1a3e1e20c16c97270285ba1a, d4854eff25efb06d0d84c13e7129bbdba4125f8c, a4bb5d1bc2f238461bcbe5303eb500466690bb2c, 55520f65fd447e04099a2c44185453c18ea73b7e, 87b318ba81dda2ee7b603f4f6c55e78ec3e95974 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | ed9eccbe8970f6eedc1b978c157caf1251a896d4 ≤ v < 4ffea48c69cb2b96a281cb7e5e42d706996631db, ed9eccbe8970f6eedc1b978c157caf1251a896d4 ≤ v < 8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c, ed9eccbe8970f6eedc1b978c157caf1251a896d4 ≤ v < 2670932f2465793fea1ef073e40883e8390fa4d9, ed9eccbe8970f6eedc1b978c157caf1251a896d4 ≤ v < 6db19822512396be1a3e1e20c16c97270285ba1a, ed9eccbe8970f6eedc1b978c157caf1251a896d4 ≤ v < d4854eff25efb06d0d84c13e7129bbdba4125f8c, ed9eccbe8970f6eedc1b978c157caf1251a896d4 ≤ v < a4bb5d1bc2f238461bcbe5303eb500466690bb2c, ed9eccbe8970f6eedc1b978c157caf1251a896d4 ≤ v < 55520f65fd447e04099a2c44185453c18ea73b7e, ed9eccbe8970f6eedc1b978c157caf1251a896d4 ≤ v < 87b318ba81dda2ee7b603f4f6c55e78ec3e95974, 2.6.29 | 4ffea48c69cb2b96a281cb7e5e42d706996631db, 8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c, 2670932f2465793fea1ef073e40883e8390fa4d9, 6db19822512396be1a3e1e20c16c97270285ba1a, d4854eff25efb06d0d84c13e7129bbdba4125f8c, a4bb5d1bc2f238461bcbe5303eb500466690bb2c, 55520f65fd447e04099a2c44185453c18ea73b7e, 87b318ba81dda2ee7b603f4f6c55e78ec3e95974 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.