Null Dereference Vulnerability in Linux Kernel's Queueing Framework

CVE-2025-40083

What is CVE-2025-40083?

A critical null dereference vulnerability exists in the Linux kernel's queueing framework, specifically within the sch_qfq scheduler. This flaw occurs when a function call within the scheduler's code path returns a NULL value, leading to a potential system crash. Recent updates implement preventive measures to ensure that the return value is properly checked before use, mirroring existing safeguards in other components. These enhancements not only address the immediate defect but also refine the underlying code structure for better maintainability.

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