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CVE-2025-22009

Estado: ModificadaMedia (5.5)—

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

regulator: dummy: force synchronous probing

Sometimes I get a NULL pointer dereference at boot time in kobject_get() with the following call stack:

By placing some extra BUG_ON() statements I could verify that this is raised because probing of the 'dummy' regulator driver is not completed ('dummy_regulator_rdev' is still NULL).

In the JTAG debugger I can see that dummy_regulator_probe() and anatop_regulator_probe() can be run by different kernel threads (kworker/u4:*).

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I haven't further investigated whether this can be changed or if there are other possibilities to force synchronization between these two probe routines. On the other hand I don't expect much boot time penalty by probing the 'dummy' regulator synchronously.

Detalles técnicos trazas, registros y código del informe original
anatop_regulator_probe()
 devm_regulator_register()
  regulator_register()
   regulator_resolve_supply()
    kobject_get()

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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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nregulator: dummy: force synchronous probing\n\nSometimes I get a NULL pointer dereference at boot time in kobject_get()\nwith the following call stack:\n\nanatop_regulator_probe()\n devm_regulator_register()\n  regulator_register()\n   regulator_resolve_supply()\n    kobject_get()\n\nBy placing some extra BUG_ON() statements I could verify that this is\nraised because probing of the 'dummy' regulator driver is not completed\n('dummy_regulator_rdev' is still NULL).\n\nIn the JTAG debugger I can see that dummy_regulator_probe() and\nanatop_regulator_probe() can be run by different kernel threads\n(kworker/u4:*).  I haven't further investigated whether this can be\nchanged or if there are other possibilities to force synchronization\nbetween these two probe routines.  On the other hand I don't expect much\nboot time penalty by probing the 'dummy' regulator synchronously."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: regulator: dummy: force synchronous sondeo a veces obtengo una desreferencia de puntero NULL en el momento del arranque en kobject_get() con la siguiente pila de llamadas: anatop_regulator_probe() devm_regulator_register() regulator_register() regulator_resolve_supply() kobject_get() Colocando algunas sentencias BUG_ON() adicionales pude verificar que esto se genera porque el sondeo del controlador del regulador 'dummy' no se completa ('dummy_regulator_rdev' sigue siendo NULL). En el depurador JTAG puedo ver que dummy_regulator_probe() y anatop_regulator_probe() pueden ser ejecutados por diferentes subprocesos del kernel (kworker/u4:*). No he investigado más si esto se puede cambiar o si hay otras posibilidades de forzar la sincronización entre estas dos rutinas de sondeo. Por otro lado, no espero mucha penalización en el tiempo de arranque al sondear el regulador 'dummy' sincrónicamente."
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