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CVE-2024-49874

Estado: ModificadaAlta (7)—

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

i3c: master: svc: Fix use after free vulnerability in svc_i3c_master Driver Due to Race Condition

In the svc_i3c_master_probe function, &master->hj_work is bound with svc_i3c_master_hj_work, &master->ibi_work is bound with svc_i3c_master_ibi_work. And svc_i3c_master_ibi_work can start the hj_work, svc_i3c_master_irq_handler can start the ibi_work.

If we remove the module which will call svc_i3c_master_remove to make cleanup, it will free master->base through i3c_master_unregister while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows:

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CPU0 CPU1

| svc_i3c_master_hj_work svc_i3c_master_remove | i3c_master_unregister(&master->base)| device_unregister(&master->dev) | device_release | //free master->base | | i3c_master_do_daa(&master->base) | //use master->base

Fix it by ensuring that the work is canceled before proceeding with the cleanup in svc_i3c_master_remove.

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 en controlador local (AV:L, PR:L) sin interacción. Explotación mediante T1068 para escalada. El impacto es ejecución de código arbitrario (T1059) al usar memoria liberada en contexto del kernel.

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)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni3c: master: svc: Fix use after free vulnerability in svc_i3c_master Driver Due to Race Condition\n\nIn the svc_i3c_master_probe function, &master->hj_work is bound with\nsvc_i3c_master_hj_work, &master->ibi_work is bound with\nsvc_i3c_master_ibi_work. And svc_i3c_master_ibi_work  can start the\nhj_work, svc_i3c_master_irq_handler can start the ibi_work.\n\nIf we remove the module which will call svc_i3c_master_remove to\nmake cleanup, it will free master->base through i3c_master_unregister\nwhile the work mentioned above will be used. The sequence of operations\nthat may lead to a UAF bug is as follows:\n\nCPU0                                         CPU1\n\n                                    | svc_i3c_master_hj_work\nsvc_i3c_master_remove               |\ni3c_master_unregister(&master->base)|\ndevice_unregister(&master->dev)     |\ndevice_release                      |\n//free master->base                 |\n                                    | i3c_master_do_daa(&master->base)\n                                    | //use master->base\n\nFix it by ensuring that the work is canceled before proceeding with the\ncleanup in svc_i3c_master_remove."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: i3c: master: svc: Se corrige la vulnerabilidad de use after free en el controlador svc_i3c_master debido a la condición de ejecución En la función svc_i3c_master_probe, &master->hj_work está vinculado con svc_i3c_master_hj_work, &master->ibi_work está vinculado con svc_i3c_master_ibi_work. Y svc_i3c_master_ibi_work puede iniciar hj_work, svc_i3c_master_irq_handler puede iniciar ibi_work. Si eliminamos el módulo que llamará a svc_i3c_master_remove para realizar la limpieza, liberará master->base a través de i3c_master_unregister mientras que el trabajo mencionado anteriormente se utilizará. La secuencia de operaciones que pueden provocar un error de UAF es la siguiente: CPU0 CPU1 | Solucione el problema asegurándose de que el trabajo se cancele antes de continuar con la limpieza en svc_i3c_master_remove."
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