CVE-2025-40106

Local kernel panic via zero channel count

Published Oct 31, 2025 · Updated Oct 31, 2025

Divide-by-zero in the Linux kernel Comedi subsystem allows local users to trigger a kernel panic through a malformed device command. comedi_buf_munge() applies modulo to async->munge_chan using an unchecked zero cmd.chanlist_len while handling data in the interrupt path. Reachability requires a local program to submit the command to an affected Comedi device, after which the panic can interrupt the host.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide-by-zero in the Linux kernel Comedi subsystem allows local users to trigger a kernel panic through a malformed device command. comedi_buf_munge() applies modulo to async->munge_chan using an unchecked zero cmd.chanlist_len while handling data in the interrupt path. Reachability requires a local program to submit the command to an affected Comedi device, after which the panic can interrupt the host.

The record

CVE
CVE-2025-40106
Published
Oct 31, 2025
Updated
Oct 31, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 31, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2670932f2465793fea1ef073e40883e8390fa4d9
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4ffea48c69cb2b96a281cb7e5e42d706996631db
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <55520f65fd447e04099a2c44185453c18ea73b7e
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6db19822512396be1a3e1e20c16c97270285ba1a
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <87b318ba81dda2ee7b603f4f6c55e78ec3e95974
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a4bb5d1bc2f238461bcbe5303eb500466690bb2c
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d4854eff25efb06d0d84c13e7129bbdba4125f8c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2670932f2465793fea1ef073e40883e8390fa4d9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4ffea48c69cb2b96a281cb7e5e42d706996631db; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <55520f65fd447e04099a2c44185453c18ea73b7e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6db19822512396be1a3e1e20c16c97270285ba1a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <87b318ba81dda2ee7b603f4f6c55e78ec3e95974; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a4bb5d1bc2f238461bcbe5303eb500466690bb2c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d4854eff25efb06d0d84c13e7129bbdba4125f8c

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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