Vigie VulnDBEuropean-hosted Vulnerability DB

CVE-2025-40106

comedi: fix divide-by-zero in comedi_buf_munge()

At a glance

Severity
Not available
EPSS
EPSS 0.21 % · percentile 11 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Deferred

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.

European references

CERT-FR advisories

Affected products

ProductVersions
Linux · Linuxaffected ed9eccbe8970f6eedc1b978c157caf1251a896d4 < 4ffea48c69cb2b96a281cb7e5e42d706996631db ; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 < 8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c ; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 < 2670932f2465793fea1ef073e40883e8390fa4d9 ; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 < 6db19822512396be1a3e1e20c16c97270285ba1a ; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 < d4854eff25efb06d0d84c13e7129bbdba4125f8c ; affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 < a4bb5d1bc2f238461bcbe5303eb500466690bb2c
Linux · Linuxaffected 2.6.29 ; unaffected 0 < 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.*

References

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD