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CVE-2023-52609

Estado: AnalizadaMedia (4.7)—

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: binder: corrige la ejecución entre mmput() y do_exit() La tarea A llama a binder_update_page_range() para asignar e insertar páginas en un espacio de direcciones remoto desde la tarea B. Para esto, la tarea A fija el mm remoto a través de mmget_not_zero() primero. Esto puede competir con la Tarea B do_exit() y la disminución final del recuento de mmput() provendrá de la Tarea A.

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Tarea A | Tarea B ------------------+------------------ mmget_not_zero() | | hacer_salir() | salida_mm() | mmput() mmput() | salida_mmap() | eliminar_vma() | salida() | En este caso, el trabajo de ____fput() de la Tarea B se pone en cola en la Tarea A como TWA_RESUME. Entonces, en teoría, la Tarea A regresa al espacio de usuario y se ejecuta el trabajo de limpieza. Sin embargo, la Tarea A duerme, esperando una respuesta de la Tarea B que nunca llega (está muerta). Esto significa que binder_deferred_release() está bloqueado hasta que un evento de carpeta no relacionado obligue a la Tarea A a regresar al espacio de usuario. Todas las notificaciones de defunción asociadas también se retrasarán hasta entonces. Para solucionar este problema, utilice mmput_async() que programará el trabajo en el mm->async_put_work WQ correspondiente en lugar de la Tarea A.

CVSS

Probabilidad de explotación (EPSS)

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 (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "value": "CWE-362"
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix race between mmput() and do_exit()\n\nTask A calls binder_update_page_range() to allocate and insert pages on\na remote address space from Task B. For this, Task A pins the remote mm\nvia mmget_not_zero() first. This can race with Task B do_exit() and the\nfinal mmput() refcount decrement will come from Task A.\n\n  Task A            | Task B\n  ------------------+------------------\n  mmget_not_zero()  |\n                    |  do_exit()\n                    |    exit_mm()\n                    |      mmput()\n  mmput()           |\n    exit_mmap()     |\n      remove_vma()  |\n        fput()      |\n\nIn this case, the work of ____fput() from Task B is queued up in Task A\nas TWA_RESUME. So in theory, Task A returns to userspace and the cleanup\nwork gets executed. However, Task A instead sleep, waiting for a reply\nfrom Task B that never comes (it's dead).\n\nThis means the binder_deferred_release() is blocked until an unrelated\nbinder event forces Task A to go back to userspace. All the associated\ndeath notifications will also be delayed until then.\n\nIn order to fix this use mmput_async() that will schedule the work in\nthe corresponding mm->async_put_work WQ instead of Task A."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: binder: corrige la ejecución entre mmput() y do_exit() La tarea A llama a binder_update_page_range() para asignar e insertar páginas en un espacio de direcciones remoto desde la tarea B. Para esto, la tarea A fija el mm remoto a través de mmget_not_zero() primero. Esto puede competir con la Tarea B do_exit() y la disminución final del recuento de mmput() provendrá de la Tarea A. Tarea A | Tarea B ------------------+------------------ mmget_not_zero() | | hacer_salir() | salida_mm() | mmput() mmput() | salida_mmap() | eliminar_vma() | salida() | En este caso, el trabajo de ____fput() de la Tarea B se pone en cola en la Tarea A como TWA_RESUME. Entonces, en teoría, la Tarea A regresa al espacio de usuario y se ejecuta el trabajo de limpieza. Sin embargo, la Tarea A duerme, esperando una respuesta de la Tarea B que nunca llega (está muerta). Esto significa que binder_deferred_release() está bloqueado hasta que un evento de carpeta no relacionado obligue a la Tarea A a regresar al espacio de usuario. Todas las notificaciones de defunción asociadas también se retrasarán hasta entonces. Para solucionar este problema, utilice mmput_async() que programará el trabajo en el mm->async_put_work WQ correspondiente en lugar de la Tarea A."
    }
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  "lastModified": "2026-06-17T06:43:09.087",
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