Linux Kernel Vulnerability in NetFS Rolling Buffer Synchronization

CVE-2026-98118

What is CVE-2026-98118?

A vulnerability in the Linux kernel's NetFS component involves synchronization problems related to the rolling buffer mechanism. Specifically, the collector thread faces difficulties while evaluating folios due to concurrent modifications by the application threads. The readahead feature, designed to optimize I/O by progressively loading data into a rolling buffer, performs inefficiently when folios are added mid-processing. The resolution enhances the buffer's management by ensuring that all folios are pre-loaded into the queue upfront, reducing the need for simultaneous reference handling and improving overall performance during I/O operations. This fix is critical for applications relying on efficient data handling in multi-threaded environments.

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