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CVE-2026-23089

Estado: AnalizadaAlta (7.8)—

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

ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free()

When snd_usb_create_mixer() fails, snd_usb_mixer_free() frees mixer->id_elems but the controls already added to the card still reference the freed memory. Later when snd_card_register() runs, the OSS mixer layer calls their callbacks and hits a use-after-free read.

Fix by calling snd_ctl_remove() for all mixer controls before freeing id_elems. We save the next pointer first because snd_ctl_remove() frees the current element.

Detalles técnicos trazas, registros y código del informe original
Call trace:
  get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411
  get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241
  mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381
  snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887
  ...
  snd_card_register+0x4ed/0x6d0 sound/core/init.c:923
  usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad local (AV:L, PR:L) sin interacción que permite al atacante escalada de privilegios mediante corrupción de memoria (use-after-free en CWE-416). Impacto de ejecución de código al invocar callbacks de control durante el registro de tarjeta de sonido.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free()\n\nWhen snd_usb_create_mixer() fails, snd_usb_mixer_free() frees\nmixer->id_elems but the controls already added to the card still\nreference the freed memory. Later when snd_card_register() runs,\nthe OSS mixer layer calls their callbacks and hits a use-after-free read.\n\nCall trace:\n  get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411\n  get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241\n  mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381\n  snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887\n  ...\n  snd_card_register+0x4ed/0x6d0 sound/core/init.c:923\n  usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025\n\nFix by calling snd_ctl_remove() for all mixer controls before freeing\nid_elems. We save the next pointer first because snd_ctl_remove()\nfrees the current element."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\nALSA: usb-audio: Corrección de uso después de liberación en snd_usb_mixer_free()\n\nCuando snd_usb_create_mixer() falla, snd_usb_mixer_free() libera mixer->id_elems, pero los controles ya añadidos a la tarjeta siguen referenciando la memoria liberada. Más tarde, cuando se ejecuta snd_card_register(), la capa del mezclador OSS llama a sus retrollamadas y se produce una lectura de uso después de liberación.\n\nTraza de llamada:\n  get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411\n  get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241\n  mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381\n  snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887\n  ...\n  snd_card_register+0x4ed/0x6d0 sound/core/init.c:923\n  usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025\n\nSe corrige llamando a snd_ctl_remove() para todos los controles del mezclador antes de liberar id_elems. Guardamos el siguiente puntero primero porque snd_ctl_remove() libera el elemento actual."
    }
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  "lastModified": "2026-06-17T10:20:51.850",
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