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CVE-2024-50187

Estado: ModificadaMedia (5.5)—

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

drm/vc4: Stop the active perfmon before being destroyed

Upon closing the file descriptor, the active performance monitor is not stopped. Although all perfmons are destroyed in `vc4_perfmon_close_file()`, the active performance monitor's pointer (`vc4->active_perfmon`) is still retained.

If we open a new file descriptor and submit a few jobs with performance monitors, the driver will attempt to stop the active performance monitor using the stale pointer in `vc4->active_perfmon`. However, this pointer is no longer valid because the previous process has already terminated, and all performance monitors associated with it have been destroyed and freed.

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To fix this, when the active performance monitor belongs to a given process, explicitly stop it before destroying and freeing it.

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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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: Stop the active perfmon before being destroyed\n\nUpon closing the file descriptor, the active performance monitor is not\nstopped. Although all perfmons are destroyed in `vc4_perfmon_close_file()`,\nthe active performance monitor's pointer (`vc4->active_perfmon`) is still\nretained.\n\nIf we open a new file descriptor and submit a few jobs with performance\nmonitors, the driver will attempt to stop the active performance monitor\nusing the stale pointer in `vc4->active_perfmon`. However, this pointer\nis no longer valid because the previous process has already terminated,\nand all performance monitors associated with it have been destroyed and\nfreed.\n\nTo fix this, when the active performance monitor belongs to a given\nprocess, explicitly stop it before destroying and freeing it."
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    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/vc4: Detener el monitor de rendimiento activo antes de ser destruido Al cerrar el descriptor de archivo, el monitor de rendimiento activo no se detiene. Aunque todos los monitores de rendimiento se destruyen en `vc4_perfmon_close_file()`, el puntero del monitor de rendimiento activo (`vc4->active_perfmon`) aún se conserva. Si abrimos un nuevo descriptor de archivo y enviamos algunos trabajos con monitores de rendimiento, el controlador intentará detener el monitor de rendimiento activo utilizando el puntero obsoleto en `vc4->active_perfmon`. Sin embargo, este puntero ya no es válido porque el proceso anterior ya ha finalizado y todos los monitores de rendimiento asociados con él han sido destruidos y liberados. Para solucionar esto, cuando el monitor de rendimiento activo pertenece a un proceso determinado, deténgalo explícitamente antes de destruirlo y liberarlo."
    }
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  "lastModified": "2026-08-04T11:21:30.423",
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