Critical Vulnerability in Linux Kernel: Bit Shift Out of Bounds in Comedi Driver
Summary
CVE-2025-38483: In the Linux kernel, the following vulnerability has been resolved: comedi: das16m1: Fix bit shift out of bounds When checking for a supported IRQ number, the following test is used: /* only irqs 2, 3, 4, 5, 6, 7, 10, 11... 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 management and system operations. It supports a wide range of hardware architectures and is known for its stability and performance. The kernel includes various drivers, including the Comedi driver, which facilitates data acquisition and control for various hardware devices. This vulnerability affects the Comedi driver, specifically the das16m1 device, which can lead to security risks if exploited.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the Comedi driver related to the das16m1 device. The issue arises from an unchecked integer value from userspace, which is used to determine a valid IRQ number. The bit shift operation performed on this unchecked value can lead to negative or out-of-bounds shifts, potentially causing system instability or exploitation by malicious actors. This vulnerability could allow attackers to execute arbitrary code or crash the system, posing a significant risk to users.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can limit the use of the Comedi driver for the das16m1 device until the kernel is updated. This can be done by disabling the driver or avoiding its use in applications that require IRQ handling.
Conclusion
The vulnerability CVE-2025-38483 in the Linux kernel's Comedi driver poses significant risks due to unchecked integer values leading to bit shift operations. Users are strongly encouraged to update their kernel to the latest version to mitigate these risks. Temporary workarounds are available, but they do not replace the need for a proper patch.
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FAQ
CVE-2025-38483 is a vulnerability in the Linux kernel's Comedi driver that allows for potential exploitation due to unchecked integer values leading to bit shift operations.
You can use Vulert, which monitors open-source vulnerabilities in your software. By uploading your manifest file like package-lock.json, you can check for vulnerabilities in real-time.
Exploitation of this vulnerability could lead to system crashes or arbitrary code execution, posing significant security risks to affected systems.
Yes, a patch has been released in the updated versions of the Linux kernel. Users are advised to upgrade to the latest version to mitigate the risk.
If immediate updates are not possible, consider disabling the Comedi driver for the das16m1 device as a temporary workaround until a proper update can be applied.
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