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CVE-2026-93808

Estado: RecibidaSin puntuar—

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

ALSA: usb-audio: caiaq: validate EP1 reply lengths

usb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then reads command-specific fixed items from the same URB buffer. Several paths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that urb->actual_length contains those bytes.

Add per-command length checks, use a payload length derived from the bytes after the command byte for the control-state copy, and reject short analog input payloads before the input helper reads fixed offsets from the EP1 reply.

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-2026-93808",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "lessThan": "91acd231f219452fa58285239f83945accad9513",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "lessThan": "7cc6b3745a0cea697c8d0684b3094f220281a08d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "lessThan": "add9328c91c195c494cd68a21b19e5e47a20d784",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "lessThan": "319393151367e6626affedcdd4f7b7b0286f4246",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "lessThan": "af8a172c4f71ac30d625f2966d2389a7fa872819",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "523f1dce37434a9a6623bf46e7893e2b4b10ac3c",
              "lessThan": "74f3c639f64fa5da4e1613149798b5089bce2807",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "lessThan": "aba30af07d4fe499b50209801eba9da8a815522f",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "sound/usb/caiaq/device.c",
            "sound/usb/caiaq/input.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.22"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.22",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "sound/usb/caiaq/device.c",
            "sound/usb/caiaq/input.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-24T17:17:13.797",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/319393151367e6626affedcdd4f7b7b0286f4246",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/74f3c639f64fa5da4e1613149798b5089bce2807",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7cc6b3745a0cea697c8d0684b3094f220281a08d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/91acd231f219452fa58285239f83945accad9513",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/aba30af07d4fe499b50209801eba9da8a815522f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/add9328c91c195c494cd68a21b19e5e47a20d784",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/af8a172c4f71ac30d625f2966d2389a7fa872819",
      "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: caiaq: validate EP1 reply lengths\n\nusb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then\nreads command-specific fixed items from the same URB buffer. Several\npaths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that\nurb->actual_length contains those bytes.\n\nAdd per-command length checks, use a payload length derived from the\nbytes after the command byte for the control-state copy, and reject short\nanalog input payloads before the input helper reads fixed offsets from\nthe EP1 reply."
    }
  ],
  "lastModified": "2026-10-03T11:17:50.603",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}