Use-After-Free Vulnerability in Linux Kernel - Debian Package
Summary
DEBIAN-CVE-2023-52468: In the Linux kernel, the following vulnerability has been resolved: class: fix use-after-free in class_register() The lock_class_key is still registered and can be found in lock_keys_hash hlist after subsys_private is fr... Affects linux versions < 6.6.15-1. Fixed in 6.6.15-1. How to fix ↓
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Background
The Linux kernel is the core component of the Debian operating system, responsible for managing hardware and system resources. It provides essential services for all other parts of the system, including user applications. The kernel is designed to be robust and secure, but vulnerabilities can arise due to complex interactions within its code. This specific vulnerability affects the registration of lock classes, which can lead to instability and security risks if exploited.
Vulnerability Detail
In the Linux kernel, a use-after-free vulnerability has been identified in the class_register() function. This occurs when the lock_class_key remains registered and can be accessed after the associated memory has been freed. Specifically, if a task iterates over the lock_keys_hash after the memory has been released, it may lead to invalid memory access, potentially causing system crashes or exploitation by malicious actors. The issue arises during error handling when a driver fails to register due to a duplicate filename, leading to a KASAN (Kernel Address Sanitizer) report of invalid access.
How To Fix
Minimum fixed version
6.6.15-1
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 mentioned for this vulnerability. The best course of action is to apply the patch by updating the package as described above.
Conclusion
The use-after-free vulnerability in the Linux kernel poses significant risks to system stability and security. It is crucial for users of Debian systems to update their Linux packages to the patched version 6.6.15-1 or later to mitigate these risks. Regular monitoring and vulnerability management practices, such as using tools like Vulert, can help maintain system security.
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FAQ
A use-after-free vulnerability occurs when a program continues to use a pointer after the memory it points to has been freed. This can lead to unpredictable behavior, crashes, or security exploits.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. By uploading your manifest file, such as package-lock.json, you can check for vulnerabilities without needing to install any software.
Exploitation of this vulnerability could lead to system crashes, unauthorized access to system resources, or execution of arbitrary code, compromising the integrity and security of the system.
While this vulnerability has been identified in the Debian versions of the Linux kernel, similar vulnerabilities may exist in other distributions or versions of the kernel.
If immediate updates are not possible, consider isolating the affected system from critical networks and monitoring for any unusual activity until the patch can be applied.
References
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