Linux Kernel up to 6.18-rc2 comedi comedi_buf_munge divide by zero

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.18-rc2. This issue affects the function comedi_buf_munge of the component comedi. This manipulation causes divide by zero. This vulnerability appears as CVE-2025-40106. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.18-rc2 and classified as critical. Affected by this vulnerability is the function comedi_buf_munge of the component comedi. The manipulation with an unknown input leads to a divide by zero vulnerability. The CWE definition for the vulnerability is CWE-369. The product divides a value by zero. As an impact it is known to affect availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2025-40106 since 04/16/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 272095 (Linux Distros Unpatched Vulnerability : CVE-2025-40106), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.301, 5.10.246, 5.15.196, 6.1.158, 6.6.115, 6.12.56, 6.17.6 or 6.18-rc3 eliminates this vulnerability. Applying the patch 4ffea48c69cb2b96a281cb7e5e42d706996631db/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c/2670932f2465793fea1ef073e40883e8390fa4d9/6db19822512396be1a3e1e20c16c97270285ba1a/d4854eff25efb06d0d84c13e7129bbdba4125f8c/a4bb5d1bc2f238461bcbe5303eb500466690bb2c/55520f65fd447e04099a2c44185453c18ea73b7e/87b318ba81dda2ee7b603f4f6c55e78ec3e95974 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (272095) and EUVD (EUVD-2025-37321). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Divide by zero
CWE: CWE-369 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 272095
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-40106

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.4.301/5.10.246/5.15.196/6.1.158/6.6.115/6.12.56/6.17.6/6.18-rc3
Patch: 4ffea48c69cb2b96a281cb7e5e42d706996631db/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c/2670932f2465793fea1ef073e40883e8390fa4d9/6db19822512396be1a3e1e20c16c97270285ba1a/d4854eff25efb06d0d84c13e7129bbdba4125f8c/a4bb5d1bc2f238461bcbe5303eb500466690bb2c/55520f65fd447e04099a2c44185453c18ea73b7e/87b318ba81dda2ee7b603f4f6c55e78ec3e95974

Timelineinfo

04/16/2025 CVE reserved
10/31/2025 +198 days Advisory disclosed
10/31/2025 +0 days VulDB entry created
11/01/2025 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-40106 (🔒)
GCVE (CVE): GCVE-0-2025-40106
GCVE (VulDB): GCVE-100-330763
EUVD: 🔒

Entryinfo

Created: 10/31/2025 10:58
Updated: 11/01/2025 00:52
Changes: 10/31/2025 10:58 (59), 10/31/2025 11:45 (1), 11/01/2025 00:52 (2)
Complete: 🔍
Cache ID: 216::103

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