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CVE-2026-74498

Estado: RecibidaSin puntuar—

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

ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set

When a USB audio endpoint requests full packet transfers via the fill_max descriptor flag, data_ep_set_params() promotes ep->curpacksize to ep->maxpacksize. However, maxsize is left at the original sample-rate derived value.

Since u->buffer_size is allocated as maxsize * packets, the resulting DMA buffer is far too small for the requested transfer length. When the USB host controller streams up to curpacksize bytes per packet, it writes past the end of the buffer via DMA, corrupting kernel heap memory.

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Update maxsize to curpacksize when fill_max is set so that the allocated DMA buffer size matches the actual transfer request size.

[ changed to reassign maxsize only when ep->fill_max is set -- tiwai ]

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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 (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-74498",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
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          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "version": "8fdff6a319e7dac757c558bd283dc4577e68cde7",
              "lessThan": "10c24e6fddf4bdff0b6b05a47a4347b38e6960e8",
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              "version": "5.15.216",
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              "version": "6.1.183",
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              "version": "6.6.151",
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          ],
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  ],
  "published": "2026-08-15T13:17:54.760",
  "references": [
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      "url": "https://git.kernel.org/stable/c/04595233e5606d452f9f47e6989fc7ae7440fd40",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set\n\nWhen a USB audio endpoint requests full packet transfers via the fill_max\ndescriptor flag, data_ep_set_params() promotes ep->curpacksize to\nep->maxpacksize. However, maxsize is left at the original sample-rate\nderived value.\n\nSince u->buffer_size is allocated as maxsize * packets, the resulting\nDMA buffer is far too small for the requested transfer length. When the\nUSB host controller streams up to curpacksize bytes per packet, it writes\npast the end of the buffer via DMA, corrupting kernel heap memory.\n\nUpdate maxsize to curpacksize when fill_max is set so that the allocated\nDMA buffer size matches the actual transfer request size.\n\n[ changed to reassign maxsize only when ep->fill_max is set -- tiwai ]"
    }
  ],
  "lastModified": "2026-08-19T17:21:07.203",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}