Use-After-Free Vulnerability in Linux Kernel's Trace Buffer Management

CVE-2026-89747

What is CVE-2026-89747?

A use-after-free vulnerability has been identified in the Linux kernel's handling of the trace buffer. Specifically, a flaw occurs when changing the sub-buffer order during operations on trace_pipe. This can lead to dereferencing freed memory by readers holding pointers to those pages. As a result, it can potentially compromise system stability and integrity. The kernel now implements a locking mechanism to prevent race conditions during sub-buffer order changes, ensuring that readers cannot access freed memory.

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