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CVE-2022-49530

Estado: ModificadaAlta (7.8)—

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

drm/amd/pm: fix double free in si_parse_power_table()

In function si_parse_power_table(), array adev->pm.dpm.ps and its member is allocated. If the allocation of each member fails, the array itself is freed and returned with an error code. However, the array is later freed again in si_dpm_fini() function which is called when the function returns an error.

This leads to potential double free of the array adev->pm.dpm.ps, as well as leak of its array members, since the members are not freed in the allocation function and the array is not nulled when freed.

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In addition adev->pm.dpm.num_ps, which keeps track of the allocated array member, is not updated until the member allocation is successfully finished, this could also lead to either use after free, or uninitialized variable access in si_dpm_fini().

Fix this by postponing the free of the array until si_dpm_fini() and increment adev->pm.dpm.num_ps everytime the array member is allocated.

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 doble liberación de memoria (CWE-415) en kernel Linux con acceso local (AV:L) sin interacción; explotable para escalada de privilegios o ejecución de código arbitrario.

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\ndrm/amd/pm: fix double free in si_parse_power_table()\n\nIn function si_parse_power_table(), array adev->pm.dpm.ps and its member\nis allocated. If the allocation of each member fails, the array itself\nis freed and returned with an error code. However, the array is later\nfreed again in si_dpm_fini() function which is called when the function\nreturns an error.\n\nThis leads to potential double free of the array adev->pm.dpm.ps, as\nwell as leak of its array members, since the members are not freed in\nthe allocation function and the array is not nulled when freed.\nIn addition adev->pm.dpm.num_ps, which keeps track of the allocated\narray member, is not updated until the member allocation is\nsuccessfully finished, this could also lead to either use after free,\nor uninitialized variable access in si_dpm_fini().\n\nFix this by postponing the free of the array until si_dpm_fini() and\nincrement adev->pm.dpm.num_ps everytime the array member is allocated."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amd/pm: se corrige la doble liberación en si_parse_power_table() En la función si_parse_power_table(), se asigna la matriz adev->pm.dpm.ps y su miembro. Si la asignación de cada miembro falla, la matriz en sí se libera y se devuelve con un código de error. Sin embargo, la matriz se libera más tarde nuevamente en la función si_dpm_fini() que se llama cuando la función devuelve un error. Esto conduce a una posible doble liberación de la matriz adev->pm.dpm.ps, así como a la fuga de sus miembros de matriz, ya que los miembros no se liberan en la función de asignación y la matriz no se anula cuando se libera. Además, adev->pm.dpm.num_ps, que realiza un seguimiento del miembro de la matriz asignado, no se actualiza hasta que la asignación del miembro finaliza correctamente, esto también podría conducir al use-after-free o al acceso a variables no inicializadas en si_dpm_fini(). Solucione esto posponiendo la liberación de la matriz hasta si_dpm_fini() e incremente adev->pm.dpm.num_ps cada vez que se asigne el miembro de la matriz."
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