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CVE-2026-23287
In the Linux kernel, the following vulnerability has been resolved: irqchip/sifive-plic: Fix frozen interrupt due to affinity setting PLIC ignores interrupt completion message for disabled interrupt, explained by the specification: The PLIC signals it has completed executing an interrupt handler by writing the interrupt ID it received from the claim to the claim/complete register. The PLIC does not check whether the completion ID is the same as the last claim ID for that target. If the completion ID does not match an interrupt source that is currently enabled for the target, the completion is silently ignored. This caused problems in the past, because an interrupt can be disabled while still being handled and plic_irq_eoi() had no effect. That was fixed by checking if the interrupt is disabled, and if so enable it, before sending the completion message. That check is done with irqd_irq_disabled(). However, that is not sufficient because the enable bit for the handling hart can be zero despite irqd_irq_disabled(d) being false. This can happen when affinity setting is changed while a hart is still handling the interrupt. This problem is easily reproducible by dumping a large file to uart (which generates lots of interrupts) and at the same time keep changing the uart interrupt's affinity setting. The uart port becomes frozen almost instantaneously. Fix this by checking PLIC's enable bit instead of irqd_irq_disabled().
Dit record: live koppeling— laatst opgehaald: 24 september 2026 om 04:14.
Rechtstreeks overgenomen uit NVD, CISA of de leverancier — soms Engelstalig, ongewijzigd t.o.v. de bron.
In the Linux kernel, the following vulnerability has been resolved: irqchip/sifive-plic: Fix frozen interrupt due to affinity setting PLIC ignores interrupt completion message for disabled interrupt, explained by the specification: The PLIC signals it has completed executing an interrupt handler by writing the interrupt ID it received from the claim to the claim/complete register. The PLIC does not check whether the completion ID is the same as the last claim ID for that target. If the completion ID does not match an interrupt source that is currently enabled for the target, the completion is silently ignored. This caused problems in the past, because an interrupt can be disabled while still being handled and plic_irq_eoi() had no effect. That was fixed by checking if the interrupt is disabled, and if so enable it, before sending the completion message. That check is done with irqd_irq_disabled(). However, that is not sufficient because the enable bit for the handling hart can be zero despite irqd_irq_disabled(d) being false. This can happen when affinity setting is changed while a hart is still handling the interrupt. This problem is easily reproducible by dumping a large file to uart (which generates lots of interrupts) and at the same time keep changing the uart interrupt's affinity setting. The uart port becomes frozen almost instantaneously. Fix this by checking PLIC's enable bit instead of irqd_irq_disabled().
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
LOCAL
Privileges required
LOW
User interaction
NONE
Vertrouwelijkheid
Geen
Integriteit
Geen
Beschikbaarheid
Hoog
Kans op misbruik binnen 30 dagen
0.1%
Percentiel
2e
Bron: FIRST.org, bijgewerkt op 23 september 2026.
Limit access to the interactive shell of the additional GNU/Linux subssytem to trusted personnel only.
Onze eigen Nederlandstalige interpretatie en context bij de brondata hierboven.
IACS Radar-duiding
Onze eigen interpretatie en context bij deze kwetsbaarheid — geen officiële bron.
IACS Radar-prioriteringsscore
Gebaseerd op CVSS 5.5, EPSS 0.1%, industriële relevantie 55/100.
Weegt CVSS, EPSS, KEV-status, industriële relevantie en exposure-relevantie samen — een aanvulling op, geen vervanging van, de losse scores hieronder en hierboven.
Voorwaarden voor misbruik
Operationele impact & energierelevantie
Mogelijk verlies van zicht op of besturing over het proces bij succesvol misbruik.
Beoordeeld als relevant voor de energiesector op basis van: Vermeld in een officiële CISA ICS Advisory, wat directe relevantie voor industriële besturingssystemen bevestigt. Leverancier "Siemens" is een bekende leverancier van apparatuur voor de energiesector.
Aanbevolen defensieve maatregelen
Industriële relevantiescore
Classificatie is voorlopig; handmatige verificatie door een OT-securityanalist wordt aanbevolen.
Geclassificeerd door IACS Radar-analysepijplijn (geautomatiseerd) op 24 september 2026.
IEC 62443-mapping
Automatische IACS Radar-duiding op basis van de gerapporteerde CWE-zwakteclassificatie; geen officiële certificeringsuitspraak.