Critical Vulnerability in Linux Kernel: NFSD Error Handling Flaw
Summary
DEBIAN-CVE-2024-53073: In the Linux kernel, the following vulnerability has been resolved: NFSD: Never decrement pending_async_copies on error The error flow in nfsd4_copy() calls cleanup_async_copy(), which already decrements nn->pending_asyn... Affects linux versions < 6.11.7-1. Fixed in 6.11.7-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interaction. It is known for its stability, performance, and security features. However, vulnerabilities can arise, impacting system integrity and security. This specific vulnerability affects the NFSD (Network File System Daemon) component, which is responsible for handling NFS requests. The flaw relates to improper error handling in the nfsd4_copy() function, which can lead to inconsistencies in the pending asynchronous copy operations.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the NFSD component where the pending_async_copies counter is not decremented correctly upon encountering an error. This issue arises in the error flow of the nfsd4_copy() function, which calls cleanup_async_copy() without properly managing the pending_async_copies count. As a result, this can lead to resource leaks and potential denial of service, as the system may incorrectly report the number of ongoing asynchronous operations.
How To Fix
Minimum fixed version
6.11.7-1
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, no specific workarounds have been provided for this vulnerability. It is advisable to apply the patch as soon as it is available to mitigate any risks associated with this issue.
Conclusion
The vulnerability identified in the Linux kernel's NFSD component poses significant risks due to improper error handling. It is essential for users to update their systems to the patched version to mitigate these risks and maintain system integrity.
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FAQ
The vulnerability is related to improper error handling in the NFSD component of the Linux kernel, which can lead to resource leaks.
You can use tools like Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
If exploited, this vulnerability could lead to denial of service due to resource leaks, affecting system performance and stability.
Yes, a patch has been released in version 6.11.7-1 of the Linux package. It is recommended to update to this version.
While no specific workarounds are available, it is crucial to monitor your systems closely and apply the patch as soon as possible.
References
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