Race Condition Vulnerability in Linux Kernel's Ring Buffer Functionality

CVE-2026-89771

What is CVE-2026-89771?

A race condition exists in the Linux kernel's ring buffer functionality, specifically during the resizing of trace_buffer subbuffers while being accessed by readers. The issue arises because the subbuffer size is read without proper locking, allowing for simultaneous modifications that could lead to unexpected behavior. The resolution involves replacing the usage of subbuf_size with a more reliable mechanism and synchronizing access with appropriate mutex locks. This update enhances the integrity and reliability of event logging in the kernel's ring buffer system.

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