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CVE-2022-49218

Estado: ModificadaAlta (7.1)—

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

drm/dp: Fix OOB read when handling Post Cursor2 register

The link_status array was not large enough to read the Adjust Request Post Cursor2 register, so remove the common helper function to avoid an OOB read, found with a -Warray-bounds build:

Replace the only user of the helper with an open-coded fetch and decode, similar to drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c.

Detalles técnicos trazas, registros y código del informe original
drivers/gpu/drm/drm_dp_helper.c: In function 'drm_dp_get_adjust_request_post_cursor':
drivers/gpu/drm/drm_dp_helper.c:59:27: error: array subscript 10 is outside array bounds of 'const u8[6]' {aka 'const unsigned char[6]'} [-Werror=array-bounds]
   59 |         return link_status[r - DP_LANE0_1_STATUS];
      |                ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/drm_dp_helper.c:147:51: note: while referencing 'link_status'
  147 | u8 drm_dp_get_adjust_request_post_cursor(const u8 link_status[DP_LINK_STATUS_SIZE],
      |                                          ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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 (PR:L) sin interacción (UI:N) que permite lectura fuera de límites (CWE-125 buffer over-read) en kernel Linux, potencialmente explotable para escalada de privilegios o ejecución de código.

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\ndrm/dp: Fix OOB read when handling Post Cursor2 register\n\nThe link_status array was not large enough to read the Adjust Request\nPost Cursor2 register, so remove the common helper function to avoid\nan OOB read, found with a -Warray-bounds build:\n\ndrivers/gpu/drm/drm_dp_helper.c: In function 'drm_dp_get_adjust_request_post_cursor':\ndrivers/gpu/drm/drm_dp_helper.c:59:27: error: array subscript 10 is outside array bounds of 'const u8[6]' {aka 'const unsigned char[6]'} [-Werror=array-bounds]\n   59 |         return link_status[r - DP_LANE0_1_STATUS];\n      |                ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~\ndrivers/gpu/drm/drm_dp_helper.c:147:51: note: while referencing 'link_status'\n  147 | u8 drm_dp_get_adjust_request_post_cursor(const u8 link_status[DP_LINK_STATUS_SIZE],\n      |                                          ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nReplace the only user of the helper with an open-coded fetch and decode,\nsimilar to drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/dp: Se corrige la lectura OOB al manejar el registro Post Cursor2 La matriz link_status no era lo suficientemente grande para leer el registro Post Cursor2 de solicitud de ajuste, por lo que se debe eliminar la función auxiliar común para evitar una lectura OOB, que se encontró con una compilación -Warray-bounds: drivers/gpu/drm/drm_dp_helper.c: En la función 'drm_dp_get_adjust_request_post_cursor': drivers/gpu/drm/drm_dp_helper.c:59:27: error: el subíndice 10 de la matriz está fuera de los límites de la matriz 'const u8[6]' {también conocido como 'const unsigned char[6]'} [-Werror=array-bounds] 59 | ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/drm_dp_helper.c:147:51: nota: al hacer referencia a 'link_status' 147 | u8 drm_dp_get_adjust_request_post_cursor(const u8 link_status[DP_LINK_STATUS_SIZE], | ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Reemplace el único usuario del ayudante con una búsqueda y decodificación de código abierto, similar a drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c."
    }
  ],
  "lastModified": "2026-06-17T05:17:25.153",
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