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CVE-2024-47747

Estado: ModificadaAlta (7)—

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

net: seeq: Fix use after free vulnerability in ether3 Driver Due to Race Condition

In the ether3_probe function, a timer is initialized with a callback function ether3_ledoff, bound to &prev(dev)->timer. Once the timer is started, there is a risk of a race condition if the module or device is removed, triggering the ether3_remove function to perform cleanup. The sequence of operations that may lead to a UAF bug is as follows:

CPU0 CPU1

Fix it by ensuring that the timer is canceled before proceeding with the cleanup in ether3_remove.

Detalles técnicos trazas, registros y código del informe original
                      |  ether3_ledoff
ether3_remove         |
  free_netdev(dev);   |
  put_devic           |
  kfree(dev);         |
 |  ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
                      | // use dev

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).

🎯 Técnicas ATT&CK

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

Vulnerabilidad de use-after-free (CWE-416) en controlador de red Linux que requiere acceso local (AV:L) con privilegios bajos (PR:L). La race condition en ether3_remove permite ejecución de código arbitrario tras liberar memoria, impactando en escalada de privilegios local y ejecución de comandos.

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 PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

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\nnet: seeq: Fix use after free vulnerability in ether3 Driver Due to Race Condition\n\nIn the ether3_probe function, a timer is initialized with a callback\nfunction ether3_ledoff, bound to &prev(dev)->timer. Once the timer is\nstarted, there is a risk of a race condition if the module or device\nis removed, triggering the ether3_remove function to perform cleanup.\nThe sequence of operations that may lead to a UAF bug is as follows:\n\nCPU0                                    CPU1\n\n                      |  ether3_ledoff\nether3_remove         |\n  free_netdev(dev);   |\n  put_devic           |\n  kfree(dev);         |\n |  ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);\n                      | // use dev\n\nFix it by ensuring that the timer is canceled before proceeding with\nthe cleanup in ether3_remove."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: seeq: Se corrige la vulnerabilidad de use after free en el controlador ether3 debido a una condición de ejecución En la función ether3_probe, se inicializa un temporizador con una función de devolución de llamada ether3_ledoff, vinculada a &prev(dev)->timer. Una vez que se inicia el temporizador, existe el riesgo de una condición de ejecución si se elimina el módulo o dispositivo, lo que activa la función ether3_remove para realizar la limpieza. La secuencia de operaciones que pueden provocar un error de UAF es la siguiente: CPU0 CPU1 | ether3_ledoff ether3_remove | free_netdev(dev); | put_devic | kfree(dev); | | ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2); | // use dev Corríjalo asegurándose de que el temporizador se cancele antes de continuar con la limpieza en ether3_remove."
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