Critical Vulnerability in Linux Kernel: Firmware Input Handling Issue
Summary
CVE-2025-38406: In the Linux kernel, the following vulnerability has been resolved: wifi: ath6kl: remove WARN on bad firmware input If the firmware gives bad input, that's nothing to do with the driver's stack at this point etc., so the... 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, managing hardware resources and providing essential services for software applications. It is known for its stability, performance, and security features. However, vulnerabilities can arise, impacting its reliability. This specific vulnerability affects the ath6kl driver, which is responsible for handling wireless communications in devices using Qualcomm Atheros chipsets. The issue arises from improper handling of bad firmware input, which can lead to unexpected behavior in the driver.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the ath6kl driver related to the handling of firmware input. When the firmware provides invalid input, the driver previously triggered a warning (WARN_ON), which does not contribute to resolving the issue. This behavior has been reported frequently in syzbot reports, indicating a need for better error handling. The vulnerability could lead to instability in wireless communications, potentially affecting device performance and user experience.
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. However, users are advised to monitor their systems for any unusual behavior and apply the patch as soon as it is available.
Conclusion
The CVE-2025-38406 vulnerability in the Linux kernel's ath6kl driver highlights the importance of proper error handling in firmware input. Users are encouraged to update their systems to the latest patched version to mitigate potential risks associated with this vulnerability.
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FAQ
CVE-2025-38406 is a vulnerability in the Linux kernel's ath6kl driver, related to improper handling of bad firmware input.
This vulnerability can lead to instability in wireless communications, potentially affecting the performance of devices using the ath6kl driver.
If you are using Debian 13, you should update your Linux kernel to version 6.12.37-1 to fix this vulnerability.
Yes, you can use Vulert, which monitors and alerts in real-time for open-source vulnerabilities using a manifest file like package-lock.json.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
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