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CVE-2024-47141

Estado: ModificadaMedia (5.5)—

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

pinmux: Use sequential access to access desc->pinmux data

When two client of the same gpio call pinctrl_select_state() for the same functionality, we are seeing NULL pointer issue while accessing desc->mux_owner.

Let's say two processes A, B executing in pin_request() for the same pin and process A updates the desc->mux_usecount but not yet updated the desc->mux_owner while process B see the desc->mux_usecount which got updated by A path and further executes strcmp and while accessing desc->mux_owner it crashes with NULL pointer.

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Serialize the access to mux related setting with a mutex lock.

Detalles técnicos trazas, registros y código del informe original
	cpu0 (process A)			cpu1(process B)

pinctrl_select_state() {		  pinctrl_select_state() {
  pin_request() {				pin_request() {
  ...
						 ....
    } else {
         desc->mux_usecount++;
    						desc->mux_usecount && strcmp(desc->mux_owner, owner)) {

         if (desc->mux_usecount > 1)
               return 0;
         desc->mux_owner = owner;

  }						}

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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  "id": "CVE-2024-47141",
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          "version": "2.0.3",
          "timestamp": "2025-10-01T19:55:54.896424Z"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npinmux: Use sequential access to access desc->pinmux data\n\nWhen two client of the same gpio call pinctrl_select_state() for the\nsame functionality, we are seeing NULL pointer issue while accessing\ndesc->mux_owner.\n\nLet's say two processes A, B executing in pin_request() for the same pin\nand process A updates the desc->mux_usecount but not yet updated the\ndesc->mux_owner while process B see the desc->mux_usecount which got\nupdated by A path and further executes strcmp and while accessing\ndesc->mux_owner it crashes with NULL pointer.\n\nSerialize the access to mux related setting with a mutex lock.\n\n\tcpu0 (process A)\t\t\tcpu1(process B)\n\npinctrl_select_state() {\t\t  pinctrl_select_state() {\n  pin_request() {\t\t\t\tpin_request() {\n  ...\n\t\t\t\t\t\t ....\n    } else {\n         desc->mux_usecount++;\n    \t\t\t\t\t\tdesc->mux_usecount && strcmp(desc->mux_owner, owner)) {\n\n         if (desc->mux_usecount > 1)\n               return 0;\n         desc->mux_owner = owner;\n\n  }\t\t\t\t\t\t}"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: pinmux: usar acceso secuencial para acceder a los datos de desc->pinmux Cuando dos clientes del mismo gpio llaman a pinctrl_select_state() para la misma funcionalidad, vemos un problema de puntero NULL al acceder a desc->mux_owner. Digamos que dos procesos A, B se ejecutan en pin_request() para el mismo pin y el proceso A actualiza desc->mux_usecount pero aún no actualiza desc->mux_owner mientras que el proceso B ve desc->mux_usecount que fue actualizado por la ruta A y luego ejecuta strcmp y mientras accede a desc->mux_owner se bloquea con el puntero NULL. Serialice el acceso a la configuración relacionada con mux con un bloqueo de mutex. cpu0 (proceso A) cpu1 (proceso B) pinctrl_select_state() { pinctrl_select_state() { pin_request() { pin_request() { ... .... } de lo contrario { desc->mux_usecount++; desc->mux_usecount && strcmp(desc->mux_owner, propietario)) { si (desc->mux_usecount > 1) devuelve 0; desc->mux_owner = propietario; } }"
    }
  ],
  "lastModified": "2026-06-17T07:56:37.030",
  "configurations": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}