Critical Vulnerability in Linux Kernel: Uninitialized Data in Comedi Insn_RW Emulation
Summary
CVE-2025-38480: In the Linux kernel, the following vulnerability has been resolved: comedi: Fix use of uninitialized data in insn_rw_emulate_bits() For Comedi INSN_READ and INSN_WRITE instructions on "digital" subdevices (subdevice type... 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 supports various functionalities, including process management, memory management, and device control. The Comedi subsystem within the kernel facilitates data acquisition and control for various hardware devices. However, it has been found to have a vulnerability that can lead to incorrect data handling in digital input/output operations.
Vulnerability Detail
In the Linux kernel, a vulnerability exists in the Comedi subsystem's handling of INSN_READ and INSN_WRITE instructions. Specifically, the function insn_rw_emulate_bits() does not properly handle cases where the number of samples (insn->n) is zero. This oversight can lead to the use of uninitialized data from the data[0] value, potentially causing incorrect values to be written to digital output channels. This vulnerability can compromise the integrity of data being processed and may lead to unpredictable behavior in applications relying on accurate data acquisition.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, if you are unable to update the package immediately, you can implement checks in your application to ensure that the number of samples (insn->n) is greater than zero before invoking any read or write operations. This can prevent the use of uninitialized data.
Conclusion
The vulnerability CVE-2025-38480 in the Linux kernel's Comedi subsystem poses a significant risk due to the potential for uninitialized data usage in digital input/output operations. It is crucial for users to update their systems to the patched version to ensure data integrity and system reliability.
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FAQ
CVE-2025-38480 is a vulnerability in the Linux kernel's Comedi subsystem that allows for the use of uninitialized data in certain digital input/output operations.
This vulnerability can lead to incorrect data being written to or read from digital channels, potentially causing erratic behavior in applications that depend on accurate data acquisition.
Yes, a patch is available. Users are advised to update their Linux packages to the latest version to mitigate this vulnerability.
As a temporary measure, ensure that your application checks that the number of samples is greater than zero before performing read or write operations.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software using just a manifest file like package-lock.json. You can also check your application for vulnerabilities using the Vulert playground without any signup.
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