Critical Vulnerability in Linux Kernel: comedi AIO IRQ Handling Flaw
Summary
CVE-2025-38529: In the Linux kernel, the following vulnerability has been resolved: comedi: aio_iiro_16: Fix bit shift out of bounds When checking for a supported IRQ number, the following test is used: if ((1 options[1]) & 0xdcfc) { Ho... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interaction. It is known for its stability, performance, and flexibility, making it a popular choice for servers, desktops, and embedded systems. This vulnerability affects the comedi driver, which is responsible for interfacing with data acquisition hardware. The flaw arises from improper handling of user-supplied data, potentially leading to system instability or security breaches.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the comedi driver related to the handling of interrupt request (IRQ) numbers. The issue occurs when an unchecked integer value from userspace is used to determine the shift amount in a bitwise operation. This can lead to a bit shift that is out of bounds or negative, resulting in unpredictable behavior. The vulnerability could allow an attacker to exploit this flaw, potentially leading to denial of service or other security issues.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. Users are advised to apply the patch as soon as it becomes available to mitigate any risks associated with this issue.
Conclusion
The CVE-2025-38529 vulnerability in the Linux kernel's comedi driver poses significant risks due to improper handling of IRQ numbers. Users are strongly encouraged to update their systems to the patched versions to ensure security and stability. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
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FAQ
CVE-2025-38529 is a vulnerability in the Linux kernel's comedi driver that allows for improper handling of user-supplied IRQ numbers, potentially leading to system instability.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. By utilizing the Vulert playground, you can check if your application is affected without needing to install any software.
The vulnerability could lead to denial of service, system crashes, or unauthorized access, depending on how it is exploited.
Yes, patches are available for Debian 12 (version 6.1.147-1) and Debian 13 (version 6.12.41-1). Users should update their systems to these versions.
While there are no specific workarounds, it is recommended to monitor the situation closely and apply the patch as soon as possible to mitigate risks.
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