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CVE-2022-49203

Estado: ModificadaMedia (5.5)—

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

drm/amd/display: Fix double free during GPU reset on DC streams

[Why] The issue only occurs during the GPU reset code path.

We first backup the current state prior to commiting 0 streams internally from DM to DC. This state backup contains valid link encoder assignments.

DC will clear the link encoder assignments as part of current state (but not the backup, since it was a copied before the commit) and free the extra stream reference it held.

DC requires that the link encoder assignments remain cleared/invalid prior to commiting. Since the backup still has valid assignments we call the interface post reset to clear them.

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This routine also releases the extra reference that the link encoder interface held - resulting in a double free (and eventually a NULL pointer dereference).

[How] We'll have to do a full DC commit anyway after GPU reset because the stream count previously went to 0.

We don't need to retain the assignment that we had backed up, so just copy off of the now clean current state assignment after the reset has occcurred with the new link_enc_cfg_copy() interface.

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)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix double free during GPU reset on DC streams\n\n[Why]\nThe issue only occurs during the GPU reset code path.\n\nWe first backup the current state prior to commiting 0 streams\ninternally from DM to DC. This state backup contains valid link\nencoder assignments.\n\nDC will clear the link encoder assignments as part of current state\n(but not the backup, since it was a copied before the commit) and\nfree the extra stream reference it held.\n\nDC requires that the link encoder assignments remain cleared/invalid\nprior to commiting. Since the backup still has valid assignments we\ncall the interface post reset to clear them. This routine also\nreleases the extra reference that the link encoder interface held -\nresulting in a double free (and eventually a NULL pointer dereference).\n\n[How]\nWe'll have to do a full DC commit anyway after GPU reset because\nthe stream count previously went to 0.\n\nWe don't need to retain the assignment that we had backed up, so\njust copy off of the now clean current state assignment after the\nreset has occcurred with the new link_enc_cfg_copy() interface."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amd/display: Arreglar doble liberación durante el reinicio de la GPU en flujos de DC [Por qué] El problema solo ocurre durante la ruta del código de reinicio de la GPU. Primero hacemos una copia de seguridad del estado actual antes de confirmar 0 flujos internamente desde DM a DC. Esta copia de seguridad del estado contiene asignaciones de codificador de enlace válidas. DC borrará las asignaciones de codificador de enlace como parte del estado actual (pero no la copia de seguridad, ya que se copió antes de el commit) y liberará la referencia de flujo adicional que tenía. DC requiere que las asignaciones de codificador de enlace permanezcan borradas/inválidas antes de el commit. Dado que la copia de seguridad aún tiene asignaciones válidas, llamamos a la interfaz post reset para borrarlas. Esta rutina también libera la referencia adicional que tenía la interfaz de codificador de enlace, lo que da como resultado una doble liberación (y eventualmente una desreferencia de puntero NULL). [Cómo] Tendremos que hacer una confirmación de DC completa de todos modos después de reiniciar la GPU porque el conteo de transmisiones anteriormente llegó a 0. No necesitamos conservar la asignación que habíamos respaldado, así que simplemente copiamos la asignación del estado actual ahora limpio después de que se haya producido el reinicio con la nueva interfaz link_enc_cfg_copy()."
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  "lastModified": "2026-08-04T10:17:38.903",
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