NULL Pointer Dereference in Linux Kernel Affects System Stability

CVE-2026-43271

What is CVE-2026-43271?

A NULL pointer dereference vulnerability exists in the Linux Kernel's process_metadata_update function, which can lead to kernel panic under specific conditions. During the MD array startup sequence, if a METADATA_UPDATED message is received prematurely, the processing of this message occurs while the main metadata thread is uninitialized. This race condition can result in critical system failure. To mitigate this, developers must implement a check for the thread pointer's validity and return early if it is NULL, ensuring system stability.

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