CVE-2024-49573: sched/fair: Fix NEXT_BUDDY

First published: Sat Jan 11 2025(Updated: )

In the Linux kernel, the following vulnerability has been resolved: sched/fair: Fix NEXT_BUDDY Adam reports that enabling NEXT_BUDDY insta triggers a WARN in pick_next_entity(). Moving clear_buddies() up before the delayed dequeue bits ensures no ->next buddy becomes delayed. Further ensure no new ->next buddy ever starts as delayed.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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