VulnerabilityPublished 31 Oct 2025

CVE-2025-40106: Linux kernel · comedi: fix divide-by-zero in comedi_buf_munge()

Source GCVE Database

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Not known to be exploited.

Data as of 29 Oct 2026, 23:29 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Exploitation evidence

Disclosed: evidence found.
CVE published 31 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-6hvg-fq9h-5pm6

What to do

AI-suggested

A fix has been implemented that adds a check for zero chanlist_len in the comedi_buf_munge() function to prevent divide-by-zero errors. Users should apply the official Linux kernel update containing this fix once it is available. Until then, avoid submitting commands with chanlist_len set to zero to mitigate the risk.

Description

A divide-by-zero vulnerability was identified and fixed in the Linux kernel's comedi_buf_munge() function. The function performed a modulo operation without checking if the divisor (chanlist_len) was zero, which could cause a kernel panic if a user submitted a command with chanlist_len set to zero. The fix adds a check for zero chanlist_len and returns early to prevent the error.

References

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