Deadlock Vulnerability in Linux Kernel Affecting Process Notification Mechanism

CVE-2026-23400

What is CVE-2026-23400?

A vulnerability exists in the Linux kernel's handling of process notifications that can lead to a deadlock scenario. When a remote process dies and sends a death notification message, the local process responds with commands that can interfere with thread management. Specifically, if a non-looper thread calls certain commands while holding a process lock, it leads to a situation where the kernel cannot proceed—this is a classic deadlock. This issue has been traced to the improper handling of locks during process notification clean-up. The vulnerability has been addressed by modifying the way locks are managed, ensuring that the proc lock does not obstruct normal thread operations. This fix is crucial for maintaining the stability and reliability of systems that rely on the Linux kernel.

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