Linux Kernel Vulnerability Affects Namespace Management

CVE-2025-40203

What is CVE-2025-40203?

A vulnerability in the Linux kernel arises from improper handling of paths within namespace management. Specifically, the function listmount does not manage the reference count correctly when calling path_put() while under a namespace semaphore. This oversight could lead to unstable behavior in filesystem operations, particularly when the last reference is released unintentionally. Addressing this issue is crucial to ensure the integrity of namespace handling within the Linux kernel, thus preventing potential system disruptions.

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