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Vulnerability DatabaseCVE-2025-40203
CVE-2025-40203:
Linux Kernel vulnerability analysis and mitigation
Overview
A vulnerability in the Linux kernel was identified and assigned CVE-2025-40203. The issue relates to improper handling of path_put() calls under namespace semaphore in the listmount functionality. This vulnerability was disclosed on November 12, 2025 and affects various Linux kernel versions (NVD, Ubuntu).
Technical details
The vulnerability involves the listmount() function making path_put() calls while holding the namespace semaphore, which could lead to system instability if the last reference is released. The issue specifically affects the kernel's mount namespace handling mechanism (NVD).
Impact
If exploited, this vulnerability could potentially lead to system instability or crashes when the last reference is released during mount namespace operations (NVD).
Mitigation and workarounds
The vulnerability has been resolved through patches that modify the listmount() function to ensure proper handling of path_put() calls in relation to the namespace semaphore. Multiple kernel versions have been patched to address this issue (Ubuntu).
Additional resources
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
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