Infinite Loop Vulnerability in Linux Kernel's exFAT Implementation
Summary
DEBIAN-CVE-2025-38692: In the Linux kernel, the following vulnerability has been resolved: exfat: add cluster chain loop check for dir An infinite loop may occur if the following conditions occur due to file system corruption. Affects linux versions < 6.12.43-1. Fixed in 6.12.43-1. How to fix ↓
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Background
The Linux kernel is a core component of many operating systems, providing essential services for hardware management and system resource allocation. The exFAT file system, supported by the Linux kernel, is designed for flash drives and SD cards, enabling efficient storage and retrieval of files. However, the exFAT implementation has been found to be vulnerable to specific conditions that can lead to infinite loops, particularly when file system corruption occurs.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the exFAT file system that can lead to infinite loops under certain conditions. These conditions include scenarios where the cluster chain contains loops and there are no unused entries available. The affected functions, such as exfat_count_dir_entries(), exfat_create_upcase_table(), and exfat_load_bitmap(), can enter an infinite loop, causing system hangs and potential denial of service. This vulnerability arises from inadequate checks for loop conditions in the cluster chain, which can be exploited by malicious actors or result from file system corruption.
How To Fix
Minimum fixed version
6.12.43-1
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 highly recommended to apply the available patches as soon as possible to mitigate the risk.
Conclusion
The infinite loop vulnerability in the Linux kernel's exFAT implementation poses a significant risk, particularly in scenarios involving file system corruption. Users are urged to update their systems promptly to the patched versions to mitigate this risk and ensure system stability.
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FAQ
The vulnerability allows for infinite loops in the exFAT file system implementation within the Linux kernel, potentially leading to system hangs.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected by this vulnerability.
If exploited, this vulnerability can lead to denial of service, causing the system to become unresponsive due to infinite loops.
Yes, patches are available for Debian 13 and 14. Ensure you update to the specified versions to mitigate the vulnerability.
While there are no specific workarounds, it is crucial to prioritize applying the patches as soon as possible to avoid potential exploitation.
References
Related vulnerabilities
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