Performance Object Vulnerability in Linux Kernel

CVE-2025-39799

What is CVE-2025-39799?

A recent vulnerability in the Linux kernel affects the ACPI processor's performance management. The issue originates from a commit that introduced a performance check, impacting the frequency Quality of Service (QoS) request for CPUs lacking a performance object. This flaw can cause the system to trigger a warning when attempting to take the CPU offline, resulting in unintended system behavior. The fix involves modifying the order of checks, ensuring that the frequency QoS request can be added consistently, improving overall stability when managing CPU performance.

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