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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/2670932f2465793fea1ef073e40883e8390fa4d9 cve-icon cve-icon
https://git.kernel.org/stable/c/4ffea48c69cb2b96a281cb7e5e42d706996631db cve-icon cve-icon
https://git.kernel.org/stable/c/55520f65fd447e04099a2c44185453c18ea73b7e cve-icon cve-icon
https://git.kernel.org/stable/c/6db19822512396be1a3e1e20c16c97270285ba1a cve-icon cve-icon
https://git.kernel.org/stable/c/87b318ba81dda2ee7b603f4f6c55e78ec3e95974 cve-icon cve-icon
https://git.kernel.org/stable/c/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c cve-icon cve-icon
https://git.kernel.org/stable/c/a4bb5d1bc2f238461bcbe5303eb500466690bb2c cve-icon cve-icon
https://git.kernel.org/stable/c/d4854eff25efb06d0d84c13e7129bbdba4125f8c cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025103155-CVE-2025-40106-ed47@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-40106 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-40106 cve-icon
History

Mon, 03 Nov 2025 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Sat, 01 Nov 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Fri, 31 Oct 2025 10:00:00 +0000

Type Values Removed Values Added
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.
Title comedi: fix divide-by-zero in comedi_buf_munge()
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-10-31T09:41:46.740Z

Updated: 2025-10-31T09:41:46.740Z

Reserved: 2025-04-16T07:20:57.166Z

Link: CVE-2025-40106

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-10-31T10:15:50.520

Modified: 2025-11-04T15:41:31.450

Link: CVE-2025-40106

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-10-31T00:00:00Z

Links: CVE-2025-40106 - Bugzilla