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CVE-2024-50144

Estado: ModificadaMedia (5.5)—

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

drm/xe: fix unbalanced rpm put() with fence_fini()

Currently we can call fence_fini() twice if something goes wrong when sending the GuC CT for the tlb request, since we signal the fence and return an error, leading to the caller also calling fini() on the error path in the case of stack version of the flow, which leads to an extra rpm put() which might later cause device to enter suspend when it shouldn't. It looks like we can just drop the fini() call since the fence signaller side will already call this for us.

There are known mysterious splats with device going to sleep even with an rpm ref, and this could be one candidate.

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(cherry picked from commit cfcbc0520d5055825f0647ab922b655688605183)

Detalles técnicos trazas, registros y código del informe original
v2 (Matt B):
  - Prefer warning if we detect double fini()

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/xe: fix unbalanced rpm put() with fence_fini()\n\nCurrently we can call fence_fini() twice if something goes wrong when\nsending the GuC CT for the tlb request, since we signal the fence and\nreturn an error, leading to the caller also calling fini() on the error\npath in the case of stack version of the flow, which leads to an extra\nrpm put() which might later cause device to enter suspend when it\nshouldn't. It looks like we can just drop the fini() call since the\nfence signaller side will already call this for us.\n\nThere are known mysterious splats with device going to sleep even with\nan rpm ref, and this could be one candidate.\n\nv2 (Matt B):\n  - Prefer warning if we detect double fini()\n\n(cherry picked from commit cfcbc0520d5055825f0647ab922b655688605183)"
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/xe: corregir rpm put() desequilibrado con fence_fini() Actualmente podemos llamar a fence_fini() dos veces si algo sale mal al enviar el GuC CT para la solicitud tlb, ya que señalamos a fence y devolvemos un error, lo que lleva a que el llamador también llame a fini() en la ruta de error en el caso de la versión de pila del flujo, lo que lleva a un rpm put() adicional que más tarde podría hacer que el dispositivo entre en suspensión cuando no debería. Parece que podemos simplemente descartar la llamada a fini() ya que el lado del señalizador de fence ya lo llamará por nosotros. Hay splats misteriosos conocidos con el dispositivo entrando en suspensión incluso con una referencia rpm, y este podría ser un candidato. v2 (Matt B): - Preferimos advertencia si detectamos fini() doble (seleccionado de el commit cfcbc0520d5055825f0647ab922b655688605183)"
    }
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  "lastModified": "2026-06-17T08:03:42.203",
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