Ring Buffer Vulnerability in Linux Kernel Affects System Performance

CVE-2025-21777

Summary

A validation issue in the Linux kernel's ring buffer allows for the potential corruption of the subbuffer array metadata. This occurs when duplicates are introduced into the array without triggering a validation error. As a result, the ring buffer link list may become unstable, leading to potential data corruption. Although the situation identified did not crash the kernel immediately, the existence of duplicate entries within the writer's path poses a serious threat to system reliability and integrity. The recommended solution involves implementing a bitmask array for efficient duplicate detection and ensuring robust validation.

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