Use After Free Vulnerability in Linux Kernel Affecting Multiple Features

CVE-2026-53341

What is CVE-2026-53341?

A use after free vulnerability exists within the Linux kernel due to improper handling of the mnt_ns during mounts. This flaw can lead to race conditions where mount namespaces may be unmounted while accessed concurrently, potentially resulting in security issues such as leaking privileged information, causing endless loops, or even crashing the kernel. The vulnerability arises specifically when configuration options like CONFIG_PREEMPTION or CONFIG_RCU_STRICT_GRACE_PERIOD are enabled. Organizations utilizing the affected kernel versions are advised to update to the patched versions to mitigate potential risks associated with this race condition.

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