Critical Vulnerability in Linux Kernel: Out of Bounds Array Indexing in Wifi Module
Summary
DEBIAN-CVE-2024-38562: In the Linux kernel, the following vulnerability has been resolved: wifi: nl80211: Avoid address calculations via out of bounds array indexing Before request->channels[] can be used, request->n_channels must be set. Affects linux versions < 6.8.12-1. Fixed in 6.8.12-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, including Debian. It manages hardware resources and provides essential services for software applications. The kernel is known for its stability and performance, but vulnerabilities can arise, affecting system security and functionality. This specific vulnerability relates to the nl80211 wifi module, which is responsible for managing wireless networking in Linux. The issue stems from improper handling of array indexing, leading to potential security risks.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the wifi nl80211 module, where address calculations can be performed via out-of-bounds array indexing. This occurs when the request->channels[] array is accessed without ensuring that request->n_channels is set correctly. If the calculations for memory beyond the 'channels' array are based on an out-of-bounds index, it can lead to undefined behavior, including potential memory corruption and security breaches.
How To Fix
Minimum fixed version
6.8.12-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds provided for this vulnerability. The best course of action is to apply the patch by updating the Linux kernel to the fixed version.
Conclusion
The identified vulnerability in the Linux kernel's wifi nl80211 module poses significant risks due to improper array indexing. It is crucial for users to update their systems to the patched version to mitigate these risks. Regular monitoring for vulnerabilities using tools like Vulert can enhance security and ensure system integrity.
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FAQ
The vulnerability involves out-of-bounds array indexing in the wifi nl80211 module of the Linux kernel, which can lead to memory corruption.
You can use Vulert, which monitors open-source vulnerabilities in your software. By uploading a manifest file like package-lock.json, you can check for vulnerabilities without needing to install any software.
If exploited, this vulnerability could lead to system instability, unauthorized access, or other security breaches due to memory corruption.
Yes, the vulnerability affects Debian versions 13 and 14 of the Linux package prior to version 6.8.12-1.
It is recommended to regularly check for vulnerabilities, especially after updates or changes to your software environment. Using tools like Vulert can help automate this process.
References
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