PT-2026-40689 · Linux · Linux

Published

2026-05-13

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Updated

2026-05-15

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CVE-2026-43482

None

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In the Linux kernel, the following vulnerability has been resolved:
sched ext: Disable preemption between scx claim exit() and kicking helper work
scx claim exit() atomically sets exit kind, which prevents scx error() from triggering further error handling. After claiming exit, the caller must kick the helper kthread work which initiates bypass mode and teardown.
If the calling task gets preempted between claiming exit and kicking the helper work, and the BPF scheduler fails to schedule it back (since error handling is now disabled), the helper work is never queued, bypass mode never activates, tasks stop being dispatched, and the system wedges.
Disable preemption across scx claim exit() and the subsequent work kicking in all callers - scx disable() and scx vexit(). Add lockdep assert preemption disabled() to scx claim exit() to enforce the requirement.

Related Identifiers

CVE-2026-43482

Affected Products

Linux