CVE-2021-47650

Estado: AnalizadaMedia (5.5)—

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

ASoC: soc-compress: prevent the potentially use of null pointer

There is one call trace that snd_soc_register_card() ->snd_soc_bind_card()->soc_init_pcm_runtime() ->snd_soc_dai_compress_new()->snd_soc_new_compress(). In the trace the 'codec_dai' transfers from card->dai_link, and we can see from the snd_soc_add_pcm_runtime() in snd_soc_bind_card() that, if value of card->dai_link->num_codecs is 0, then 'codec_dai' could be null pointer caused by index out of bound in 'asoc_rtd_to_codec(rtd, 0)'.

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And snd_soc_register_card() is called by various platforms. Therefore, it is better to add the check in the case of misusing. And because 'cpu_dai' has already checked in soc_init_pcm_runtime(), there is no need to check again. Adding the check as follow, then if 'codec_dai' is null, snd_soc_new_compress() will not pass through the check 'if (playback + capture != 1)', avoiding the leftover use of 'codec_dai'.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.25%
Percentil entre todas las CVEs puntuadas: 15
Fecha de la puntuación: 6/10/2026

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

CWE-476

Referencias

JSON original (NVD)

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          "integrityImpact": "NONE",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: soc-compress: prevent the potentially use of null pointer\n\nThere is one call trace that snd_soc_register_card()\n->snd_soc_bind_card()->soc_init_pcm_runtime()\n->snd_soc_dai_compress_new()->snd_soc_new_compress().\nIn the trace the 'codec_dai' transfers from card->dai_link,\nand we can see from the snd_soc_add_pcm_runtime() in\nsnd_soc_bind_card() that, if value of card->dai_link->num_codecs\nis 0, then 'codec_dai' could be null pointer caused\nby index out of bound in 'asoc_rtd_to_codec(rtd, 0)'.\nAnd snd_soc_register_card() is called by various platforms.\nTherefore, it is better to add the check in the case of misusing.\nAnd because 'cpu_dai' has already checked in soc_init_pcm_runtime(),\nthere is no need to check again.\nAdding the check as follow, then if 'codec_dai' is null,\nsnd_soc_new_compress() will not pass through the check\n'if (playback + capture != 1)', avoiding the leftover use of\n'codec_dai'."
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ASoC: soc-compress: evita el posible uso de un puntero nulo Hay un seguimiento de llamada que snd_soc_register_card() -&gt;snd_soc_bind_card()-&gt;soc_init_pcm_runtime() -&gt;snd_soc_dai_compress_new()-&gt;snd_soc_new_compress(). En el seguimiento, 'codec_dai' se transfiere desde card-&gt;dai_link, y podemos ver desde snd_soc_add_pcm_runtime() en snd_soc_bind_card() que, si el valor de card-&gt;dai_link-&gt;num_codecs es 0, entonces 'codec_dai' podría ser un puntero nulo causado por un índice fuera de los límites en 'asoc_rtd_to_codec(rtd, 0)'. Además, varias plataformas llaman a snd_soc_register_card(), por lo que es mejor agregar la verificación en caso de uso incorrecto. Y como 'cpu_dai' ya se ha verificado en soc_init_pcm_runtime(), no es necesario volver a verificar. Si se agrega la verificación de la siguiente manera, si 'codec_dai' es nulo, snd_soc_new_compress() no pasará la verificación 'if (playback + capture != 1)', lo que evita el uso sobrante de 'codec_dai'."
    }
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  "lastModified": "2026-06-17T04:18:14.753",
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