CVE-2026-23012

Estado: AnalizadaAlta (7.8)—

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

mm/damon/core: remove call_control in inactive contexts

If damon_call() is executed against a DAMON context that is not running, the function returns error while keeping the damon_call_control object linked to the context's call_controls list. Let's suppose the object is deallocated after the damon_call(), and yet another damon_call() is executed against the same context. The function tries to add the new damon_call_control object to the call_controls list, which still has the pointer to the previous damon_call_control object, which is deallocated. As a result, use-after-free happens.

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This can actually be triggered using the DAMON sysfs interface. It is not easily exploitable since it requires the sysfs write permission and making a definitely weird file writes, though. Please refer to the report for more details about the issue reproduction steps.

Fix the issue by making two changes. Firstly, move the final kdamond_call() for cancelling all existing damon_call() requests from terminating DAMON context to be done before the ctx->kdamond reset. This makes any code that sees NULL ctx->kdamond can safely assume the context may not access damon_call() requests anymore. Secondly, let damon_call() to cleanup the damon_call_control objects that were added to the already-terminated DAMON context, before returning the error.

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: 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 Interpreterexecution70 %

CWE-416 (use-after-free) con acceso local (AV:L) sin UI, permite escalar privilegios en kernel. La ejecución arbitraria sigue del acceso memoria.

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\nmm/damon/core: remove call_control in inactive contexts\n\nIf damon_call() is executed against a DAMON context that is not running,\nthe function returns error while keeping the damon_call_control object\nlinked to the context's call_controls list.  Let's suppose the object is\ndeallocated after the damon_call(), and yet another damon_call() is\nexecuted against the same context.  The function tries to add the new\ndamon_call_control object to the call_controls list, which still has the\npointer to the previous damon_call_control object, which is deallocated. \nAs a result, use-after-free happens.\n\nThis can actually be triggered using the DAMON sysfs interface.  It is not\neasily exploitable since it requires the sysfs write permission and making\na definitely weird file writes, though.  Please refer to the report for\nmore details about the issue reproduction steps.\n\nFix the issue by making two changes.  Firstly, move the final\nkdamond_call() for cancelling all existing damon_call() requests from\nterminating DAMON context to be done before the ctx->kdamond reset.  This\nmakes any code that sees NULL ctx->kdamond can safely assume the context\nmay not access damon_call() requests anymore.  Secondly, let damon_call()\nto cleanup the damon_call_control objects that were added to the\nalready-terminated DAMON context, before returning the error."
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      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/damon/core: eliminar call_control en contextos inactivos\n\nSi damon_call() se ejecuta contra un contexto DAMON que no está en ejecución, la función devuelve un error mientras mantiene el objeto damon_call_control vinculado a la lista call_controls del contexto. Supongamos que el objeto es desasignado después de damon_call(), y se ejecuta otro damon_call() contra el mismo contexto. La función intenta añadir el nuevo objeto damon_call_control a la lista call_controls, que todavía tiene el puntero al objeto damon_call_control anterior, que está desasignado. Como resultado, ocurre un uso después de liberación.\n\nEsto puede ser realmente activado usando la interfaz sysfs de DAMON. Sin embargo, no es fácilmente explotable ya que requiere el permiso de escritura de sysfs y realizar escrituras de archivo definitivamente extrañas. Por favor, consulte el informe para más detalles sobre los pasos de reproducción del problema.\n\nSolucione el problema realizando dos cambios. En primer lugar, mueva la kdamond_call() final para cancelar todas las solicitudes damon_call() existentes del contexto DAMON que termina, para que se realice antes del reinicio de ctx-&gt;kdamond. Esto hace que cualquier código que vea NULL en ctx-&gt;kdamond pueda asumir con seguridad que el contexto ya no puede acceder a las solicitudes damon_call(). En segundo lugar, permita que damon_call() limpie los objetos damon_call_control que fueron añadidos al contexto DAMON ya terminado, antes de devolver el error."
    }
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  "lastModified": "2026-06-17T10:20:42.530",
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