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CVE-2023-52492

Estado: AnalizadaMedia (4.4)—
Detalles técnicos trazas, registros y código del informe original
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: dmaengine: corrige el puntero NULL en la función de cancelación del registro del canal __dma_async_device_channel_register() puede fallar. En caso de falla, chan->local se libera (con free_percpu()) y chan->local se anula. Cuando se llama a dma_async_device_unregister() (debido a una API administrada o intencionalmente por el controlador del controlador DMA), los canales se anulan incondicionalmente, lo que lleva a este puntero NULL: [1.318693] No se puede manejar la desreferencia del puntero NULL del kernel en la dirección virtual 00000000000000d0 [...] [ 1.484499] Seguimiento de llamadas: [ 1.486930] device_del+0x40/0x394 [ 1.490314] device_unregister+0x20/0x7c [ 1.494220] __dma_async_device_channel_unregister+0x68/0xc0 Mire la ruta de error de la función dma_async_device_register(), cancelación del registro del dispositivo La ración se realiza sólo si chan->local es no nulo. Luego agregue la misma condición al comienzo de la función __dma_async_device_channel_unregister(), para evitar problemas de puntero NULL cualquiera que sea la API utilizada para alcanzar esta función.

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 (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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  "weaknesses": [
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: fix NULL pointer in channel unregistration function\n\n__dma_async_device_channel_register() can fail. In case of failure,\nchan->local is freed (with free_percpu()), and chan->local is nullified.\nWhen dma_async_device_unregister() is called (because of managed API or\nintentionally by DMA controller driver), channels are unconditionally\nunregistered, leading to this NULL pointer:\n[    1.318693] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0\n[...]\n[    1.484499] Call trace:\n[    1.486930]  device_del+0x40/0x394\n[    1.490314]  device_unregister+0x20/0x7c\n[    1.494220]  __dma_async_device_channel_unregister+0x68/0xc0\n\nLook at dma_async_device_register() function error path, channel device\nunregistration is done only if chan->local is not NULL.\n\nThen add the same condition at the beginning of\n__dma_async_device_channel_unregister() function, to avoid NULL pointer\nissue whatever the API used to reach this function."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvió la siguiente vulnerabilidad: dmaengine: corrige el puntero NULL en la función de cancelación del registro del canal __dma_async_device_channel_register() puede fallar. En caso de falla, chan->local se libera (con free_percpu()) y chan->local se anula. Cuando se llama a dma_async_device_unregister() (debido a una API administrada o intencionalmente por el controlador del controlador DMA), los canales se anulan incondicionalmente, lo que lleva a este puntero NULL: [1.318693] No se puede manejar la desreferencia del puntero NULL del kernel en la dirección virtual 00000000000000d0 [...] [ 1.484499] Seguimiento de llamadas: [ 1.486930] device_del+0x40/0x394 [ 1.490314] device_unregister+0x20/0x7c [ 1.494220] __dma_async_device_channel_unregister+0x68/0xc0 Mire la ruta de error de la función dma_async_device_register(), cancelación del registro del dispositivo La ración se realiza sólo si chan->local es no nulo. Luego agregue la misma condición al comienzo de la función __dma_async_device_channel_unregister(), para evitar problemas de puntero NULL cualquiera que sea la API utilizada para alcanzar esta función."
    }
  ],
  "lastModified": "2026-06-17T06:42:51.210",
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