Description
In the Linux kernel, the following vulnerability has been resolved:
sched_ext: Abort directly from the hardlockup handler
scx_hardlockup() defers the abort to an irq_work because exit claiming used to take scx_sched_lock and couldn't run from NMI. The deferral is now unnecessary - claiming is NMI-safe and asserting ->aborting is exactly what breaks the live-locks that hard-lock CPUs. Call handle_lockup() directly and drop the irq_work. This also makes the self-detected case recoverable: the perf watchdog fires on the hard-locked CPU itself, where a queued irq_work never runs with IRQs off.
Also fix the return value: %true used to be returned whenever sched_ext was loaded, suppressing the kernel's hardlockup report even when the abort was refused. Return %true only when this call initiated the abort.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= bd2d76455b65aab77652823919db128a8e585825, < 4d6270bbb4e083a4d2d39f3c36f30f5c939c06ed; >= bd2d76455b65aab77652823919db128a8e585825, < 3c4b38064937a761ebbf85b1649e812db85eb59e |
| Linux | Linux | 7.1 |
References
Timeline
- Published
- Sep 17, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Received