FKIE_CVE-2025-68783

Vulnerability from fkie_nvd - Published: 2026-01-13 16:15 - Updated: 2026-04-15 00:35
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-mixer: us16x08: validate meter packet indices get_meter_levels_from_urb() parses the 64-byte meter packets sent by the device and fills the per-channel arrays meter_level[], comp_level[] and master_level[] in struct snd_us16x08_meter_store. Currently the function derives the channel index directly from the meter packet (MUB2(meter_urb, s) - 1) and uses it to index those arrays without validating the range. If the packet contains a negative or out-of-range channel number, the driver may write past the end of these arrays. Introduce a local channel variable and validate it before updating the arrays. We reject negative indices, limit meter_level[] and comp_level[] to SND_US16X08_MAX_CHANNELS, and guard master_level[] updates with ARRAY_SIZE(master_level).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2168866396bd28ec4f3c8da0fbc7d08b5bd4f053
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2f21a7cbaaa93926f5be15bc095b9c57c35748d9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53461710a95e15ac1f6542450943a492ecf8e550
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5526c1c6ba1d0913c7dfcbbd6fe1744ea7c55f1e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a8ad320efb663be30b794e3dd3e829301c0d0ed3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cde47f4ccad6751ac36b7471572ddf38ee91870c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eaa95228b8a56c4880a182c0350d67922b22408f
Impacted products
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-mixer: us16x08: validate meter packet indices\n\nget_meter_levels_from_urb() parses the 64-byte meter packets sent by\nthe device and fills the per-channel arrays meter_level[],\ncomp_level[] and master_level[] in struct snd_us16x08_meter_store.\n\nCurrently the function derives the channel index directly from the\nmeter packet (MUB2(meter_urb, s) - 1) and uses it to index those\narrays without validating the range. If the packet contains a\nnegative or out-of-range channel number, the driver may write past\nthe end of these arrays.\n\nIntroduce a local channel variable and validate it before updating the\narrays. We reject negative indices, limit meter_level[] and\ncomp_level[] to SND_US16X08_MAX_CHANNELS, and guard master_level[]\nupdates with ARRAY_SIZE(master_level)."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nALSA: usb-mixer: us16x08: validar los \u00edndices de los paquetes de medidor\n\nget_meter_levels_from_urb() analiza los paquetes de medidor de 64 bytes enviados por el dispositivo y rellena los arrays por canal meter_level[], comp_level[] y master_level[] en la estructura snd_us16x08_meter_store.\n\nActualmente, la funci\u00f3n deriva el \u00edndice del canal directamente del paquete de medidor (MUB2(meter_urb, s) - 1) y lo usa para indexar esos arrays sin validar el rango. Si el paquete contiene un n\u00famero de canal negativo o fuera de rango, el controlador puede escribir m\u00e1s all\u00e1 del final de estos arrays.\n\nIntroduce una variable de canal local y val\u00eddala antes de actualizar los arrays. Rechazamos los \u00edndices negativos, limitamos meter_level[] y comp_level[] a SND_US16X08_MAX_CHANNELS, y protegemos las actualizaciones de master_level[] con ARRAY_SIZE(master_level)."
    }
  ],
  "id": "CVE-2025-68783",
  "lastModified": "2026-04-15T00:35:42.020",
  "metrics": {},
  "published": "2026-01-13T16:15:58.000",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2168866396bd28ec4f3c8da0fbc7d08b5bd4f053"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2f21a7cbaaa93926f5be15bc095b9c57c35748d9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/53461710a95e15ac1f6542450943a492ecf8e550"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5526c1c6ba1d0913c7dfcbbd6fe1744ea7c55f1e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a8ad320efb663be30b794e3dd3e829301c0d0ed3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cde47f4ccad6751ac36b7471572ddf38ee91870c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/eaa95228b8a56c4880a182c0350d67922b22408f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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