Critical Memory Management Vulnerability in Linux Kernel - CVE-2023-40791
Summary
DEBIAN-CVE-2023-40791: extract_user_to_sg in lib/scatterlist.c in the Linux kernel before 6.4.12 fails to unpin pages in a certain situation, as demonstrated by a WARNING for try_grab_page. Affects linux versions < 6.4.13-1. Fixed in 6.4.13-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interaction. It is known for its stability, performance, and security features. However, vulnerabilities can arise, impacting system integrity and security. CVE-2023-40791 is a significant issue that affects versions of the Linux kernel prior to 6.4.12, specifically related to memory management in the 'extract_user_to_sg' function.
Vulnerability Detail
CVE-2023-40791 is a vulnerability in the Linux kernel that occurs in the 'extract_user_to_sg' function located in 'lib/scatterlist.c'. This vulnerability fails to unpin pages under certain conditions, which can lead to memory leaks and potential system instability. The issue was identified before version 6.4.12, and it is critical as it may allow unauthorized access to memory, leading to data corruption or system crashes.
How To Fix
Minimum fixed version
6.4.13-1
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 to the latest version of the Linux kernel.
Conclusion
CVE-2023-40791 is a critical vulnerability in the Linux kernel that requires immediate attention. Updating to the patched version is essential to maintain system security and stability. Utilizing tools like Vulert can help in monitoring vulnerabilities effectively.
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FAQ
CVE-2023-40791 is a vulnerability in the Linux kernel that affects memory management, specifically in the 'extract_user_to_sg' function.
You can check if your system is affected by using tools like Vulert, which monitors open-source vulnerabilities in real-time. Visit Vulert Scanner to check your application without any signup.
The risks include potential memory leaks, system instability, and unauthorized access to memory, which could lead to data corruption or crashes.
Yes, a patch is available in version 6.4.13-1 of the Linux kernel. It is recommended to update to this version or later.
If immediate updates are not possible, monitor your system closely for unusual behavior and consider isolating affected systems until the patch can be applied.
References
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