Critical Divide-by-Zero Vulnerability in Linux Kernel - CVE-2025-40106
Summary
DEBIAN-CVE-2025-40106: 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_le... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware management and system resource allocation. It supports a wide range of functionalities, including process management, memory management, and device control. The kernel is crucial for system stability and performance. However, vulnerabilities within the kernel can lead to severe security risks, including system crashes and unauthorized access.
Vulnerability Detail
In the Linux kernel, a divide-by-zero vulnerability has been identified in the comedi_buf_munge() function. This issue arises when a user program submits a command with chanlist_len set to zero, leading to a divide-by-zero error during data processing in the interrupt handler. The lack of a preliminary check for zero chanlist_len can cause kernel panics, resulting in system instability and potential data loss.
How To Fix
No fixed version is published for this vulnerability.
Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →
Workaround
As a temporary workaround, avoid submitting commands with chanlist_len set to zero. This will prevent the divide-by-zero error from occurring until the kernel can be updated with the patch.
Conclusion
The CVE-2025-40106 vulnerability in the Linux kernel poses a significant risk due to its potential to cause system crashes. Users are strongly advised to update their kernel to the latest patched version to mitigate this risk. Until an update can be applied, avoiding commands that could trigger the vulnerability is recommended.
See every vulnerability recorded for linux →
FAQ
CVE-2025-40106 is a critical vulnerability in the Linux kernel that can lead to a divide-by-zero error, causing potential kernel panics.
If exploited, this vulnerability can cause system crashes and instability, potentially leading to data loss or unauthorized access.
The vulnerability affects multiple Debian versions, including Debian 11, 12, 13, and 14.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
As a temporary measure, avoid submitting commands with chanlist_len set to zero to prevent triggering the vulnerability.
References
Related vulnerabilities
Recent vulnerabilities recorded for linux.
