{ "id": "CVE-2023-52609", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2024-03-18T11:15:07.743", "lastModified": "2025-03-10T15:28:37.830", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [ { "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 ejecuci\u00f3n entre mmput() y do_exit() La tarea A llama a binder_update_page_range() para asignar e insertar p\u00e1ginas en un espacio de direcciones remoto desde la tarea B. Para esto, la tarea A fija el mm remoto a trav\u00e9s de mmget_not_zero() primero. Esto puede competir con la Tarea B do_exit() y la disminuci\u00f3n final del recuento de mmput() provendr\u00e1 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 teor\u00eda, 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 (est\u00e1 muerta). Esto significa que binder_deferred_release() est\u00e1 bloqueado hasta que un evento de carpeta no relacionado obligue a la Tarea A a regresar al espacio de usuario. Todas las notificaciones de defunci\u00f3n asociadas tambi\u00e9n se retrasar\u00e1n hasta entonces. Para solucionar este problema, utilice mmput_async() que programar\u00e1 el trabajo en el mm->async_put_work WQ correspondiente en lugar de la Tarea A." } ], "metrics": { "cvssMetricV31": [ { "source": "nvd@nist.gov", "type": "Primary", "cvssData": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 4.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH" }, "exploitabilityScore": 1.0, "impactScore": 3.6 } ] }, "weaknesses": [ { "source": "nvd@nist.gov", "type": "Primary", "description": [ { "lang": "en", "value": "CWE-362" } ] } ], "configurations": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", 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