CVE-2026-46270

Estado: AnalizadaAlta (8.4)—

In the Linux kernel, the following vulnerability has been resolved:

power: supply: rt9455: Fix use-after-free in power_supply_changed()

Using the `devm_` variant for requesting IRQ _before_ the `devm_` variant for allocating/registering the `power_supply` handle, means that the `power_supply` handle will be deallocated/unregistered _before_ the interrupt handler (since `devm_` naturally deallocates in reverse allocation order). This means that during removal, there is a race condition where an interrupt can fire just _after_ the `power_supply` handle has been freed, *but* just _before_ the corresponding unregistration of the IRQ handler has run.

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This will lead to the IRQ handler calling `power_supply_changed()` with a freed `power_supply` handle. Which usually crashes the system or otherwise silently corrupts the memory...

Note that there is a similar situation which can also happen during `probe()`; the possibility of an interrupt firing _before_ registering the `power_supply` handle. This would then lead to the nasty situation of using the `power_supply` handle *uninitialized* in `power_supply_changed()`.

Fix this racy use-after-free by making sure the IRQ is requested _after_ the registration of the `power_supply` handle.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 8.4

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.19%
Percentil entre todas las CVEs puntuadas: 8
Fecha de la puntuación: 5/10/2026

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution75 %

Vulnerabilidad local (AV:L/PR:N/UI:N) de use-after-free (CWE-416) en kernel Linux que permite ejecución de código con privilegios elevados. El atacante local explota la condición de carrera para corromper memoria o crashear el sistema, logrando escalada de privilegios y ejecución arbitraria.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: rt9455: Fix use-after-free in power_supply_changed()\n\nUsing the `devm_` variant for requesting IRQ _before_ the `devm_`\nvariant for allocating/registering the `power_supply` handle, means that\nthe `power_supply` handle will be deallocated/unregistered _before_ the\ninterrupt handler (since `devm_` naturally deallocates in reverse\nallocation order). This means that during removal, there is a race\ncondition where an interrupt can fire just _after_ the `power_supply`\nhandle has been freed, *but* just _before_ the corresponding\nunregistration of the IRQ handler has run.\n\nThis will lead to the IRQ handler calling `power_supply_changed()` with\na freed `power_supply` handle. Which usually crashes the system or\notherwise silently corrupts the memory...\n\nNote that there is a similar situation which can also happen during\n`probe()`; the possibility of an interrupt firing _before_ registering\nthe `power_supply` handle. This would then lead to the nasty situation\nof using the `power_supply` handle *uninitialized* in\n`power_supply_changed()`.\n\nFix this racy use-after-free by making sure the IRQ is requested _after_\nthe registration of the `power_supply` handle."
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\npower: supply: rt9455: Corrección de uso después de liberación en power_supply_changed()\n\nUsar la variante 'devm_' para solicitar IRQ _antes_ de la variante 'devm_' para asignar/registrar el manejador 'power_supply', significa que el manejador 'power_supply' será desasignado/dado de baja _antes_ del gestor de interrupciones (ya que 'devm_' desasigna naturalmente en orden inverso de asignación). Esto significa que durante la eliminación, existe una condición de carrera donde una interrupción puede dispararse justo _después_ de que el manejador 'power_supply' haya sido liberado, pero justo _antes_ de que se haya ejecutado la baja correspondiente del gestor de IRQ.\n\nEsto llevará a que el gestor de IRQ llame a 'power_supply_changed()' con un manejador 'power_supply' liberado. Lo que usualmente bloquea el sistema o de otra manera corrompe silenciosamente la memoria...\n\nTenga en cuenta que existe una situación similar que también puede ocurrir durante 'probe()'; la posibilidad de que una interrupción se dispare _antes_ de registrar el manejador 'power_supply'. Esto entonces llevaría a la desagradable situación de usar el manejador 'power_supply' sin inicializar en 'power_supply_changed()'.\n\nCorrija este uso después de liberación con condición de carrera asegurándose de que la IRQ sea solicitada _después_ del registro del manejador 'power_supply'."
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