CVE-2025-40106comedi: fix divide-by-zero in comedi_buf_munge()
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- May 11, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 4ffea48c69cb2b96a281cb7e5e42d706996631db; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 2670932f2465793fea1ef073e40883e8390fa4d9; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 6db19822512396be1a3e1e20c16c97270285ba1a; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before d4854eff25efb06d0d84c13e7129bbdba4125f8c; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before a4bb5d1bc2f238461bcbe5303eb500466690bb2c; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 55520f65fd447e04099a2c44185453c18ea73b7e; from ed9eccbe8970f6eedc1b978c157caf1251a896d4 before 87b318ba81dda2ee7b603f4f6c55e78ec3e95974 | CNA record |
References
- https://git.kernel.org/stable/c/4ffea48c69cb2b96a281cb7e5e42d706996631db
- https://git.kernel.org/stable/c/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c
- https://git.kernel.org/stable/c/2670932f2465793fea1ef073e40883e8390fa4d9
- https://git.kernel.org/stable/c/6db19822512396be1a3e1e20c16c97270285ba1a
- https://git.kernel.org/stable/c/d4854eff25efb06d0d84c13e7129bbdba4125f8c
- https://git.kernel.org/stable/c/a4bb5d1bc2f238461bcbe5303eb500466690bb2c
- https://git.kernel.org/stable/c/55520f65fd447e04099a2c44185453c18ea73b7e
- https://git.kernel.org/stable/c/87b318ba81dda2ee7b603f4f6c55e78ec3e95974
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.