CVE-2025-40106comedi: fix divide-by-zero in comedi_buf_munge()
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 89% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 7 months later
· 7 months later
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 – < 4ffea48c69cb2b96a281cb7e5e42d706996631db
- affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 – < 8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c
- affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 – < 2670932f2465793fea1ef073e40883e8390fa4d9
- affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 – < 6db19822512396be1a3e1e20c16c97270285ba1a
- affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 – < d4854eff25efb06d0d84c13e7129bbdba4125f8c
- affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 – < a4bb5d1bc2f238461bcbe5303eb500466690bb2c
- affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 – < 55520f65fd447e04099a2c44185453c18ea73b7e
- affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 – < 87b318ba81dda2ee7b603f4f6c55e78ec3e95974
- affected 2.6.29
- unaffected < 2.6.29
- unaffected 5.4.301 – ≤ 5.4.*
- unaffected 5.10.246 – ≤ 5.10.*
- unaffected 5.15.196 – ≤ 5.15.*
- unaffected 6.1.158 – ≤ 6.1.*
- unaffected 6.6.115 – ≤ 6.6.*
- unaffected 6.12.56 – ≤ 6.12.*
- unaffected 6.17.6 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References8
- https://git.kernel.org/stable/c/4ffea48c69cb2b96a281cb7e5e42d706996631db (opens in a new tab)
- https://git.kernel.org/stable/c/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c (opens in a new tab)
- https://git.kernel.org/stable/c/2670932f2465793fea1ef073e40883e8390fa4d9 (opens in a new tab)
- https://git.kernel.org/stable/c/6db19822512396be1a3e1e20c16c97270285ba1a (opens in a new tab)
- https://git.kernel.org/stable/c/d4854eff25efb06d0d84c13e7129bbdba4125f8c (opens in a new tab)
- https://git.kernel.org/stable/c/a4bb5d1bc2f238461bcbe5303eb500466690bb2c (opens in a new tab)
- https://git.kernel.org/stable/c/55520f65fd447e04099a2c44185453c18ea73b7e (opens in a new tab)
- https://git.kernel.org/stable/c/87b318ba81dda2ee7b603f4f6c55e78ec3e95974 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-37321 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-40106)Record last updated .