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CVE-2025-21943

Estado: ModificadaMedia (4.7)—

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

gpio: aggregator: protect driver attr handlers against module unload

Both new_device_store and delete_device_store touch module global resources (e.g. gpio_aggregator_lock). To prevent race conditions with module unload, a reference needs to be held.

Add try_module_get() in these handlers.

For new_device_store, this eliminates what appears to be the most dangerous scenario: if an id is allocated from gpio_aggregator_idr but platform_device_register has not yet been called or completed, a concurrent module unload could fail to unregister/delete the device, leaving behind a dangling platform device/GPIO forwarder. This can result in various issues. The following simple reproducer demonstrates these problems:

Detalles técnicos trazas, registros y código del informe original
  #!/bin/bash
  while :; do
    # note: whether 'gpiochip0 0' exists or not does not matter.
    echo 'gpiochip0 0' > /sys/bus/platform/drivers/gpio-aggregator/new_device
  done &
  while :; do
    modprobe gpio-aggregator
    modprobe -r gpio-aggregator
  done &
  wait

  Starting with the following warning, several kinds of warnings will appear
  and the system may become unstable:

  ------------[ cut here ]------------
  list_del corruption, ffff888103e2e980->next is LIST_POISON1 (dead000000000100)
  WARNING: CPU: 1 PID: 1327 at lib/list_debug.c:56 __list_del_entry_valid_or_report+0xa3/0x120
  [...]
  RIP: 0010:__list_del_entry_valid_or_report+0xa3/0x120
  [...]
  Call Trace:
   <TASK>
   ? __list_del_entry_valid_or_report+0xa3/0x120
   ? __warn.cold+0x93/0xf2
   ? __list_del_entry_valid_or_report+0xa3/0x120
   ? report_bug+0xe6/0x170
   ? __irq_work_queue_local+0x39/0xe0
   ? handle_bug+0x58/0x90
   ? exc_invalid_op+0x13/0x60
   ? asm_exc_invalid_op+0x16/0x20
   ? __list_del_entry_valid_or_report+0xa3/0x120
   gpiod_remove_lookup_table+0x22/0x60
   new_device_store+0x315/0x350 [gpio_aggregator]
   kernfs_fop_write_iter+0x137/0x1f0
   vfs_write+0x262/0x430
   ksys_write+0x60/0xd0
   do_syscall_64+0x6c/0x180
   entry_SYSCALL_64_after_hwframe+0x76/0x7e
   [...]
   </TASK>
  ---[ end trace 0000000000000000 ]---

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 (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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      "source": "nvd@nist.gov",
      "description": [
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: aggregator: protect driver attr handlers against module unload\n\nBoth new_device_store and delete_device_store touch module global\nresources (e.g. gpio_aggregator_lock). To prevent race conditions with\nmodule unload, a reference needs to be held.\n\nAdd try_module_get() in these handlers.\n\nFor new_device_store, this eliminates what appears to be the most dangerous\nscenario: if an id is allocated from gpio_aggregator_idr but\nplatform_device_register has not yet been called or completed, a concurrent\nmodule unload could fail to unregister/delete the device, leaving behind a\ndangling platform device/GPIO forwarder. This can result in various issues.\nThe following simple reproducer demonstrates these problems:\n\n  #!/bin/bash\n  while :; do\n    # note: whether 'gpiochip0 0' exists or not does not matter.\n    echo 'gpiochip0 0' > /sys/bus/platform/drivers/gpio-aggregator/new_device\n  done &\n  while :; do\n    modprobe gpio-aggregator\n    modprobe -r gpio-aggregator\n  done &\n  wait\n\n  Starting with the following warning, several kinds of warnings will appear\n  and the system may become unstable:\n\n  ------------[ cut here ]------------\n  list_del corruption, ffff888103e2e980->next is LIST_POISON1 (dead000000000100)\n  WARNING: CPU: 1 PID: 1327 at lib/list_debug.c:56 __list_del_entry_valid_or_report+0xa3/0x120\n  [...]\n  RIP: 0010:__list_del_entry_valid_or_report+0xa3/0x120\n  [...]\n  Call Trace:\n   <TASK>\n   ? __list_del_entry_valid_or_report+0xa3/0x120\n   ? __warn.cold+0x93/0xf2\n   ? __list_del_entry_valid_or_report+0xa3/0x120\n   ? report_bug+0xe6/0x170\n   ? __irq_work_queue_local+0x39/0xe0\n   ? handle_bug+0x58/0x90\n   ? exc_invalid_op+0x13/0x60\n   ? asm_exc_invalid_op+0x16/0x20\n   ? __list_del_entry_valid_or_report+0xa3/0x120\n   gpiod_remove_lookup_table+0x22/0x60\n   new_device_store+0x315/0x350 [gpio_aggregator]\n   kernfs_fop_write_iter+0x137/0x1f0\n   vfs_write+0x262/0x430\n   ksys_write+0x60/0xd0\n   do_syscall_64+0x6c/0x180\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n   [...]\n   </TASK>\n  ---[ end trace 0000000000000000 ]---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: gpio: gregator: protege los controladores attr del controlador contra la descarga del módulo Tanto new_device_store como delete_device_store tocan los recursos globales del módulo (por ejemplo, gpio_aggregator_lock). Para evitar condiciones de ejecución con la descarga del módulo, se debe mantener una referencia. Agregue try_module_get() en estos controladores. Para new_device_store, esto elimina lo que parece ser el escenario más peligroso: si se asigna un id desde gpio_aggregator_idr pero platform_device_register aún no se ha llamado o completado, una descarga de módulo concurrente podría fallar al anular el registro/eliminar el dispositivo, dejando atrás un reenvío de dispositivo de plataforma/GPIO colgante. Esto puede resultar en varios problemas. El siguiente reproductor simple demuestra estos problemas: #!/bin/bash while :; do # nota: no importa si 'gpiochip0 0' existe o no. echo 'gpiochip0 0' &gt; /sys/bus/platform/drivers/gpio-aggregator/new_device done &amp; while :; do modprobe gpio-aggregator modprobe -r gpio-aggregator done &amp; wait A partir de la siguiente advertencia, aparecerán varios tipos de advertencias y el sistema puede volverse inestable: ------------[ cortar aquí ]------------ list_del corruption, ffff888103e2e980-&gt;next is LIST_POISON1 (dead000000000100) WARNING: CPU: 1 PID: 1327 at lib/list_debug.c:56 __list_del_entry_valid_or_report+0xa3/0x120 [...] RIP: 0010:__list_del_entry_valid_or_report+0xa3/0x120 [...] Call Trace:  ? __list_del_entry_valid_or_report+0xa3/0x120 ? __warn.cold+0x93/0xf2 ? __list_del_entry_valid_or_report+0xa3/0x120 ? report_bug+0xe6/0x170 ? __irq_work_queue_local+0x39/0xe0 ? handle_bug+0x58/0x90 ? exc_invalid_op+0x13/0x60 ? asm_exc_invalid_op+0x16/0x20 ? __list_del_entry_valid_or_report+0xa3/0x120 gpiod_remove_lookup_table+0x22/0x60 new_device_store+0x315/0x350 [gpio_aggregator] kernfs_fop_write_iter+0x137/0x1f0 vfs_write+0x262/0x430 ksys_write+0x60/0xd0 do_syscall_64+0x6c/0x180 entry_SYSCALL_64_after_hwframe+0x76/0x7e [...]  ---[ fin de seguimiento 000000000000000 ]---"
    }
  ],
  "lastModified": "2026-06-17T08:44:40.313",
  "configurations": [
    {
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        {
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}