CVE-2026-46246

Estado: AnalizadaAlta (7.8)—

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

power: supply: pm8916_lbc: Fix use-after-free for extcon in IRQ handler

Using the `devm_` variant for requesting IRQ _before_ the `devm_` variant for allocating/registering the `extcon` handle, means that the `extcon` 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 `extcon` 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 `extcon_set_state_sync()` with a freed `extcon` handle. Which usually crashes the system or otherwise silently corrupts the memory...

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

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.17%
Percentil entre todas las CVEs puntuadas: 6
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).

🎯 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 escalation75 %
Impacto principalT1059 Command and Scripting Interpreterexecution60 %

Vulnerabilidad de use-after-free (CWE-416) en controlador Linux con acceso local (AV:L) y sin interacción (UI:N) que permite escalada de privilegios al corromper memoria del kernel durante el manejador de IRQ.

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: pm8916_lbc: Fix use-after-free for extcon in IRQ handler\n\nUsing the `devm_` variant for requesting IRQ _before_ the `devm_`\nvariant for allocating/registering the `extcon` handle, means that the\n`extcon` handle will be deallocated/unregistered _before_ the interrupt\nhandler (since `devm_` naturally deallocates in reverse allocation\norder). This means that during removal, there is a race condition where\nan interrupt can fire just _after_ the `extcon` handle has been\nfreed, *but* just _before_ the corresponding unregistration of the IRQ\nhandler has run.\n\nThis will lead to the IRQ handler calling `extcon_set_state_sync()` with\na freed `extcon` handle. Which usually crashes the system or otherwise\nsilently corrupts the memory...\n\nFix this racy use-after-free by making sure the IRQ is requested _after_\nthe registration of the `extcon` handle."
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      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\npower: supply: pm8916_lbc: Corrección de uso después de liberación para extcon en el gestor IRQ\n\nUsar la variante 'devm_' para solicitar IRQ _antes_ de la variante 'devm_' para asignar/registrar el manejador 'extcon', significa que el manejador 'extcon' 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, hay una condición de carrera donde una interrupción puede dispararse justo _después_ de que el manejador 'extcon' haya sido liberado, pero justo _antes_ de que se haya ejecutado la correspondiente anulación de registro del gestor IRQ.\n\nEsto llevará a que el gestor IRQ llame a 'extcon_set_state_sync()' con un manejador 'extcon' liberado. Lo que usualmente bloquea el sistema o de otra manera corrompe silenciosamente la memoria...\n\nCorrige este uso después de liberación propenso a condiciones de carrera asegurándose de que la IRQ sea solicitada _después_ del registro del manejador 'extcon'."
    }
  ],
  "lastModified": "2026-07-22T20:10:00.127",
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