Double-Free Vulnerability in Linux Kernel's iwlwifi Driver
Summary
DEBIAN-CVE-2024-26694: In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: fix double-free bug The storage for the TLV PC register data wasn't done like all the other storage in the drv->fw area, which is cleared... Affects linux versions < 6.7.7-1. Fixed in 6.7.7-1. 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 resources. The 'linux' package in Debian distributions is crucial for system stability and performance. The iwlwifi driver, part of this package, manages Intel wireless network adapters, enabling connectivity and communication. This vulnerability affects the driver by introducing a potential double-free condition, which can lead to system instability and security risks.
Vulnerability Detail
In the Linux kernel, specifically within the iwlwifi driver, a double-free bug has been identified due to improper handling of the TLV PC register data storage. The storage mechanism did not align with the standard practices used in the driver’s firmware area, which is typically cleared upon deallocation. As a result, if a file fails to load after parsing, the subsequent attempt to free the memory can lead to a double-free scenario, potentially causing crashes or exploitation by malicious entities.
How To Fix
Minimum fixed version
6.7.7-1
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. It is recommended to apply the patch as soon as it is available to mitigate risks.
Conclusion
The double-free vulnerability in the Linux kernel's iwlwifi driver poses significant risks to system stability and security. Users are strongly advised to update their systems to the patched version to mitigate these risks effectively. Monitoring tools like Vulert can assist in identifying vulnerabilities in real-time, ensuring that systems remain secure.
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FAQ
A double-free vulnerability occurs when a program attempts to free the same memory location more than once, which can lead to memory corruption and potential exploitation.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities. By utilizing the manifest file like package-lock.json, you can assess if your application is affected without needing to install any software.
The risks include system crashes, data corruption, and potential exploitation by attackers to execute arbitrary code or escalate privileges.
While no specific workarounds are available, it is essential to minimize exposure by ensuring that your system is not running untrusted code or applications that may exploit this vulnerability.
Detailed information can be found in the Debian CVE database or by visiting the Vulert website, which provides insights into open-source vulnerabilities.
References
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