CVE-2026-90432Hinoki check available

CPU hangs via deferred hardlockup recovery

Published Sep 17, 2026 · Updated Sep 17, 2026

Failed hardlockup recovery in Linux sched_ext 7.1 allows local users to prolong CPU hangs via deferred scheduler aborts. The scx_hardlockup() handler queues irq_work that cannot run on a hard-locked CPU with interrupts disabled, leaving the scheduler unaborted, and reports success even when aborting is refused. Exposure requires a loaded BPF scheduler and a hardlockup; the published assessment requires high local privileges, and the documented consequence is failed recovery with suppressed hardlockup reporting.

CVSS severity4.1
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Failed hardlockup recovery in Linux sched_ext 7.1 allows local users to prolong CPU hangs via deferred scheduler aborts. The scx_hardlockup() handler queues irq_work that cannot run on a hard-locked CPU with interrupts disabled, leaving the scheduler unaborted, and reports success even when aborting is refused. Exposure requires a loaded BPF scheduler and a hardlockup; the published assessment requires high local privileges, and the documented consequence is failed recovery with suppressed hardlockup reporting.

The record

CVE
CVE-2026-90432
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.1
  2. Affected versionversion=bd2d76455b65aab77652823919db128a8e585825 <3c4b38064937a761ebbf85b1649e812db85eb59e
  3. Affected versionversion=bd2d76455b65aab77652823919db128a8e585825 <4d6270bbb4e083a4d2d39f3c36f30f5c939c06ed

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=7.1; version=bd2d76455b65aab77652823919db128a8e585825 <3c4b38064937a761ebbf85b1649e812db85eb59e; version=bd2d76455b65aab77652823919db128a8e585825 <4d6270bbb4e083a4d2d39f3c36f30f5c939c06ed

Published CVSS scores

4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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