Vulnerability in Linux Kernel Affecting Task Migration

CVE-2025-21771

Summary

A vulnerability exists in the Linux kernel related to task migration, specifically in the process of differentiating between cgroup and autogroup task migrations. The scx_move_task() function was failing to accurately identify the type of migration, which led to warning messages indicating potential mismanagement of task migration. To rectify this, an argument was added to the sched_move_task() function to clarify whether the task migration is cgroup-related or autogroup-related, ensuring accurate handling of task migrations and renaming the function to scx_cgroup_move_task() for better clarity.

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