CVE-2026-23287
Estado: ModificadaMedia (5.5)—
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:
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.
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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().
Detalles técnicos trazas, registros y código del informe original
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.CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.12%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/1072020685f4b81f6efad3b412cdae0bd62bb043
- https://git.kernel.org/stable/c/1883332bf21feb8871af09daf604fc4836a76925
- https://git.kernel.org/stable/c/2edbd173309165d103be6c73bd83e459dc45ae7b
- https://git.kernel.org/stable/c/686eb378a4a51aa967e08337dd59daade16aec0f
- https://git.kernel.org/stable/c/8942fb1a5bc2dcbd88f7e656d109d42f778f298f
- https://git.kernel.org/stable/c/f611791a927141d05d7030607dea6372311c1413
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nirqchip/sifive-plic: Fix frozen interrupt due to affinity setting\n\nPLIC ignores interrupt completion message for disabled interrupt, explained\nby the specification:\n\n The PLIC signals it has completed executing an interrupt handler by\n writing the interrupt ID it received from the claim to the\n claim/complete register. The PLIC does not check whether the completion\n ID is the same as the last claim ID for that target. If the completion\n ID does not match an interrupt source that is currently enabled for\n the target, the completion is silently ignored.\n\nThis caused problems in the past, because an interrupt can be disabled\nwhile still being handled and plic_irq_eoi() had no effect. That was fixed\nby checking if the interrupt is disabled, and if so enable it, before\nsending the completion message. That check is done with irqd_irq_disabled().\n\nHowever, that is not sufficient because the enable bit for the handling\nhart can be zero despite irqd_irq_disabled(d) being false. This can happen\nwhen affinity setting is changed while a hart is still handling the\ninterrupt.\n\nThis problem is easily reproducible by dumping a large file to uart (which\ngenerates lots of interrupts) and at the same time keep changing the uart\ninterrupt's affinity setting. The uart port becomes frozen almost\ninstantaneously.\n\nFix this by checking PLIC's enable bit instead of irqd_irq_disabled()."
},
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nirqchip/sifive-plic: Solución para la interrupción congelada debido a la configuración de afinidad\n\nPLIC ignora el mensaje de finalización de interrupción para interrupciones deshabilitadas, explicado por la especificación:\n\n El PLIC señala que ha completado la ejecución de un gestor de interrupciones escribiendo el ID de interrupción que recibió de la solicitud en el registro de solicitud/finalización. El PLIC no verifica si el ID de finalización es el mismo que el último ID de solicitud para ese objetivo. Si el ID de finalización no coincide con una fuente de interrupción que está actualmente habilitada para el objetivo, la finalización es ignorada silenciosamente.\n\nEsto causó problemas en el pasado, porque una interrupción puede ser deshabilitada mientras aún está siendo gestionada y plic_irq_eoi() no tenía efecto. Eso se solucionó verificando si la interrupción está deshabilitada, y si es así, habilitarla, antes de enviar el mensaje de finalización. Esa verificación se realiza con irqd_irq_disabled().\n\nSin embargo, eso no es suficiente porque el bit de habilitación para el hart de gestión puede ser cero a pesar de que irqd_irq_disabled(d) sea falso. Esto puede ocurrir cuando la configuración de afinidad se cambia mientras un hart todavía está gestionando la interrupción.\n\nEste problema es fácilmente reproducible volcando un archivo grande a la uart (lo que genera muchas interrupciones) y al mismo tiempo seguir cambiando la configuración de afinidad de la interrupción de la uart. El puerto de la uart se congela casi instantáneamente.\n\nSolucione esto verificando el bit de habilitación del PLIC en lugar de irqd_irq_disabled()."
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"lastModified": "2026-07-14T13:18:28.873",
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