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CVE-2025-21985

Estado: ModificadaAlta (7.1)—

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

drm/amd/display: Fix out-of-bound accesses

[WHAT & HOW] hpo_stream_to_link_encoder_mapping has size MAX_HPO_DP2_ENCODERS(=4), but location can have size up to 6. As a result, it is necessary to check location against MAX_HPO_DP2_ENCODERS.

Similiarly, disp_cfg_stream_location can be used as an array index which should be 0..5, so the ASSERT's conditions should be less without equal.

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.

Acceso local (AV:L) con privilegios de usuario (PR:L) sin interacción permite corromper memoria (CWE-125, out-of-bounds) escalando privilegios del kernel. Puede resultar en ejecución de código o denegación de servicio.

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 InstallationFilter Network Traffic

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 out-of-bound accesses\n\n[WHAT & HOW]\nhpo_stream_to_link_encoder_mapping has size MAX_HPO_DP2_ENCODERS(=4),\nbut location can have size up to 6. As a result, it is necessary to\ncheck location against MAX_HPO_DP2_ENCODERS.\n\nSimiliarly, disp_cfg_stream_location can be used as an array index which\nshould be 0..5, so the ASSERT's conditions should be less without equal."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amd/display: Corrección de accesos fuera de los límites [QUÉ Y CÓMO] hpo_stream_to_link_encoder_mapping tiene un tamaño de MAX_HPO_DP2_ENCODERS(=4), pero la ubicación puede tener un tamaño de hasta 6. Por lo tanto, es necesario comparar la ubicación con MAX_HPO_DP2_ENCODERS. De igual forma, disp_cfg_stream_location puede usarse como un índice de matriz que debe ser de 0 a 5, por lo que las condiciones de ASSERT deben ser menores sin igual."
    }
  ],
  "lastModified": "2026-07-30T06:22:01.797",
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