CVE-2026-90432
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.
Affected versions
Linux kernel versions
7.1
and later are affected. Fixed in
7.2.6,
7.3-rc1
and their respective stable series.
References
2 totalFrequently asked questions
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What is CVE-2026-90432?
CVE-2026-90432 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 7.1 onward and has been patched in 7.2.6 and 7.3-rc1. CVE-2026-90432 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-90432?
Yes. CVE-2026-90432 has been patched. Fixed versions include 7.2.6 and 7.3-rc1. If you are running Linux kernel 7.1 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-90432 actively exploited?
No. CVE-2026-90432 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.