CVE-2022-49900

Estado: AnalizadaAlta (7.8)—

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

i2c: piix4: Fix adapter not be removed in piix4_remove()

In piix4_probe(), the piix4 adapter will be registered in:

Based on the probed device type, piix4_add_adapters_sb800() or single piix4_add_adapter() will be called. For the former case, piix4_adapter_count is set as the number of adapters, while for antoher case it is not set and kept default *zero*.

When piix4 is removed, piix4_remove() removes the adapters added in piix4_probe(), basing on the piix4_adapter_count value. Because the count is zero for the single adapter case, the adapter won't be removed and makes the sources allocated for adapter leaked, such as the i2c client and device.

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These sources can still be accessed by i2c or bus and cause problems. An easily reproduced case is that if a new adapter is registered, i2c will get the leaked adapter and try to call smbus_algorithm, which was already freed:

Triggered by: rmmod i2c_piix4 && modprobe max31730

Fix this problem by correctly set piix4_adapter_count as 1 for the single adapter so it can be normally removed.

Detalles técnicos trazas, registros y código del informe original

   piix4_probe()
     piix4_add_adapters_sb800() / piix4_add_adapter()
       i2c_add_adapter()

 BUG: unable to handle page fault for address: ffffffffc053d860
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 Oops: 0000 [#1] PREEMPT SMP KASAN
 CPU: 0 PID: 3752 Comm: modprobe Tainted: G
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
 RIP: 0010:i2c_default_probe (drivers/i2c/i2c-core-base.c:2259) i2c_core
 RSP: 0018:ffff888107477710 EFLAGS: 00000246
 ...
 <TASK>
  i2c_detect (drivers/i2c/i2c-core-base.c:2302) i2c_core
  __process_new_driver (drivers/i2c/i2c-core-base.c:1336) i2c_core
  bus_for_each_dev (drivers/base/bus.c:301)
  i2c_for_each_dev (drivers/i2c/i2c-core-base.c:1823) i2c_core
  i2c_register_driver (drivers/i2c/i2c-core-base.c:1861) i2c_core
  do_one_initcall (init/main.c:1296)
  do_init_module (kernel/module/main.c:2455)
  ...
 </TASK>
 ---[ end trace 0000000000000000 ]---

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.21%
Percentil entre todas las CVEs puntuadas: 10
Fecha de la puntuación: 5/10/2026

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1059 Command and Scripting Interpreterexecution45 %
Impacto secundarioT1499.004 Application or System Exploitationimpact65 %

Acceso local sin interacción (AV:L/PR:L/UI:N) permite escalada por fuga de memoria en driver i2c. El código no liberado causa pánico/DoS al cargar módulo posterior.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Filter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-415

Referencias

JSON original (NVD)

Mostrar

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  "id": "CVE-2022-49900",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: piix4: Fix adapter not be removed in piix4_remove()\n\nIn piix4_probe(), the piix4 adapter will be registered in:\n\n   piix4_probe()\n     piix4_add_adapters_sb800() / piix4_add_adapter()\n       i2c_add_adapter()\n\nBased on the probed device type, piix4_add_adapters_sb800() or single\npiix4_add_adapter() will be called.\nFor the former case, piix4_adapter_count is set as the number of adapters,\nwhile for antoher case it is not set and kept default *zero*.\n\nWhen piix4 is removed, piix4_remove() removes the adapters added in\npiix4_probe(), basing on the piix4_adapter_count value.\nBecause the count is zero for the single adapter case, the adapter won't\nbe removed and makes the sources allocated for adapter leaked, such as\nthe i2c client and device.\n\nThese sources can still be accessed by i2c or bus and cause problems.\nAn easily reproduced case is that if a new adapter is registered, i2c\nwill get the leaked adapter and try to call smbus_algorithm, which was\nalready freed:\n\nTriggered by: rmmod i2c_piix4 && modprobe max31730\n\n BUG: unable to handle page fault for address: ffffffffc053d860\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n Oops: 0000 [#1] PREEMPT SMP KASAN\n CPU: 0 PID: 3752 Comm: modprobe Tainted: G\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\n RIP: 0010:i2c_default_probe (drivers/i2c/i2c-core-base.c:2259) i2c_core\n RSP: 0018:ffff888107477710 EFLAGS: 00000246\n ...\n <TASK>\n  i2c_detect (drivers/i2c/i2c-core-base.c:2302) i2c_core\n  __process_new_driver (drivers/i2c/i2c-core-base.c:1336) i2c_core\n  bus_for_each_dev (drivers/base/bus.c:301)\n  i2c_for_each_dev (drivers/i2c/i2c-core-base.c:1823) i2c_core\n  i2c_register_driver (drivers/i2c/i2c-core-base.c:1861) i2c_core\n  do_one_initcall (init/main.c:1296)\n  do_init_module (kernel/module/main.c:2455)\n  ...\n </TASK>\n ---[ end trace 0000000000000000 ]---\n\nFix this problem by correctly set piix4_adapter_count as 1 for the\nsingle adapter so it can be normally removed."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: i2c: piix4: Adaptador de corrección que no se eliminará en piix4_remove() En piix4_probe(), el adaptador piix4 se registrará en: piix4_probe() piix4_add_adapters_sb800() / piix4_add_adapter() i2c_add_adapter() En función del tipo de dispositivo sondeado, se llamará a piix4_add_adapters_sb800() o a un solo piix4_add_adapter(). Para el primer caso, piix4_adapter_count se establece como el número de adaptadores, mientras que para otro caso no se establece y se mantiene predeterminado *cero*. Cuando se elimina piix4, piix4_remove() elimina los adaptadores agregados en piix4_probe(), basándose en el valor de piix4_adapter_count. Dado que el conteo es cero en el caso de un solo adaptador, este no se eliminará y se filtrarán las fuentes asignadas, como el cliente y el dispositivo i2c. Estas fuentes aún pueden ser accedidas por i2c o el bus, lo que puede causar problemas. Un caso que se reproduce fácilmente es que si se registra un nuevo adaptador, i2c obtendrá el adaptador filtrado e intentará llamar a smbus_algorithm, que ya se había liberado: Activado por: rmmod i2c_piix4 y modprobe max31730 ERROR: no se puede controlar el error de página para la dirección: ffffffffc053d860 #PF: acceso de lectura del supervisor en modo kernel #PF: error_code(0x0000) - página no presente Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 3752 Comm: modprobe Tainted: G Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:i2c_default_probe (drivers/i2c/i2c-core-base.c:2259) i2c_core RSP: 0018:ffff888107477710 EFLAGS: 00000246 ...  i2c_detect (controladores/i2c/i2c-core-base.c:2302) i2c_core __process_new_driver (controladores/i2c/i2c-core-base.c:1336) i2c_core bus_for_each_dev (controladores/base/bus.c:301) i2c_for_each_dev (controladores/i2c/i2c-core-base.c:1823) i2c_core i2c_register_driver (controladores/i2c/i2c-core-base.c:1861) i2c_core do_one_initcall (init/main.c:1296) do_init_module (kernel/module/main.c:2455) ...  ---[ fin del seguimiento 0000000000000000 ]--- Solucione este problema configurando correctamente piix4_adapter_count como 1 para el adaptador único de modo que se pueda quitar normalmente."
    }
  ],
  "lastModified": "2026-06-17T05:19:27.773",
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