Critical Vulnerability in Linux Kernel: Memory Allocation Lock Issue
Summary
DEBIAN-CVE-2025-38517: In the Linux kernel, the following vulnerability has been resolved: lib/alloc_tag: do not acquire non-existent lock in alloc_tag_top_users() alloc_tag_top_users() attempts to lock alloc_tag_cttype->mod_lock even when the... Affects linux versions < 6.12.41-1. Fixed in 6.12.41-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services to software applications. It is widely used across various platforms, including servers, desktops, and embedded systems. This vulnerability affects the Linux kernel versions in Debian 13 and 14, specifically related to memory allocation and locking mechanisms.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the alloc_tag_top_users() function, which attempts to acquire a lock on a non-existent semaphore. This occurs under several conditions, such as when alloc tagging is disabled or not properly initialized. The failure to check the validity of the alloc_tag_cttype pointer can lead to a crash, resulting in a general protection fault during memory allocation failures. This vulnerability can be exploited, leading to system instability and potential data loss.
How To Fix
Minimum fixed version
6.12.41-1
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. It is recommended to apply the patch as soon as it becomes available.
Conclusion
The identified vulnerability in the Linux kernel poses significant risks to system stability and data integrity. It is crucial for users of Debian 13 and 14 to update their systems to the patched versions to mitigate these risks. Regular monitoring for vulnerabilities using tools like Vulert can help maintain system security.
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FAQ
The vulnerability involves an attempt to acquire a lock on a non-existent semaphore in the Linux kernel, which can lead to system crashes.
The vulnerability affects Linux kernel versions in Debian 13 and 14 prior to the patched versions 6.12.41-1 and 6.16.3-1, respectively.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring signup.
Exploitation of this vulnerability can lead to system crashes, instability, and potential data loss during memory allocation failures.
Yes, the vulnerability can cause crashes that may result in data loss, especially during critical memory allocation operations.
References
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