FKIE_CVE-2025-71140

Vulnerability from fkie_nvd - Published: 2026-01-14 15:16 - Updated: 2026-04-15 14:34
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: media: mediatek: vcodec: Use spinlock for context list protection lock Previously a mutex was added to protect the encoder and decoder context lists from unexpected changes originating from the SCP IP block, causing the context pointer to go invalid, resulting in a NULL pointer dereference in the IPI handler. Turns out on the MT8173, the VPU IPI handler is called from hard IRQ context. This causes a big warning from the scheduler. This was first reported downstream on the ChromeOS kernels, but is also reproducible on mainline using Fluster with the FFmpeg v4l2m2m decoders. Even though the actual capture format is not supported, the affected code paths are triggered. Since this lock just protects the context list and operations on it are very fast, it should be OK to switch to a spinlock.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2c1ea6214827041f548279c9eda341eda0cc8351
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3e858938b0e659f6ec9ddcf853a87f1c5c3f44e1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5844227e0f030d2af2d85d4aed10c5eca6ca176
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b92c19675f632a41af1222027a231bc2b7efa7ed
Impacted products
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: mediatek: vcodec: Use spinlock for context list protection lock\n\nPreviously a mutex was added to protect the encoder and decoder context\nlists from unexpected changes originating from the SCP IP block, causing\nthe context pointer to go invalid, resulting in a NULL pointer\ndereference in the IPI handler.\n\nTurns out on the MT8173, the VPU IPI handler is called from hard IRQ\ncontext. This causes a big warning from the scheduler. This was first\nreported downstream on the ChromeOS kernels, but is also reproducible\non mainline using Fluster with the FFmpeg v4l2m2m decoders. Even though\nthe actual capture format is not supported, the affected code paths\nare triggered.\n\nSince this lock just protects the context list and operations on it are\nvery fast, it should be OK to switch to a spinlock."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmedia: mediatek: vcodec: Usar spinlock para el bloqueo de protecci\u00f3n de la lista de contextos\n\nAnteriormente se a\u00f1adi\u00f3 un mutex para proteger las listas de contextos del codificador y decodificador de cambios inesperados originados por el bloque IP SCP, haciendo que el puntero de contexto se volviera inv\u00e1lido, resultando en una desreferencia de puntero NULL en el manejador IPI.\n\nResulta que en el MT8173, el manejador IPI de la VPU es llamado desde el contexto de IRQ duro. Esto causa una gran advertencia del planificador. Esto fue reportado por primera vez en versiones derivadas en los kernels de ChromeOS, pero tambi\u00e9n es reproducible en la rama principal usando Fluster con los decodificadores FFmpeg v4l2m2m. Aunque el formato de captura real no es compatible, las rutas de c\u00f3digo afectadas se activan.\n\nDado que este bloqueo solo protege la lista de contextos y las operaciones sobre ella son muy r\u00e1pidas, deber\u00eda estar bien cambiar a un spinlock."
    }
  ],
  "id": "CVE-2025-71140",
  "lastModified": "2026-04-15T14:34:27.800",
  "metrics": {},
  "published": "2026-01-14T15:16:03.793",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2c1ea6214827041f548279c9eda341eda0cc8351"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3e858938b0e659f6ec9ddcf853a87f1c5c3f44e1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a5844227e0f030d2af2d85d4aed10c5eca6ca176"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b92c19675f632a41af1222027a231bc2b7efa7ed"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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