ALSA: usb-audio: fix stack info leak in RME Digiface status

{
  "id": "9a2f08c578316eb1c17eba2f8d93c353cf5534d1ff3d8737986c3c2d5fde134f",
  "url": "https://osv.dev/vulnerability/CVE-2026-74500",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ALSA: usb-audio: fix stack info leak in RME Digiface status",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix stack info leak in RME Digiface status snd_rme_digiface_read_status() reads a four-word status block from the device into an uninitialised on-stack __le32 buf[4] and, whenever the vendor control-IN transfer does not return a negative error, copies all four words into the caller's status[]. snd_usb_ctl_msg() copies the full requested size back into the caller's buffer regardless of how many bytes the data stage actually delivered: buf = kmemdup(data, size, GFP_KERNEL); err = usb_control_msg(dev, pipe, request, requesttype, value, index, buf, size, timeout); memcpy(data, buf, size); usb_control_msg() returns the transferred length on a short control-IN, which is a non-negative value, and writes only that many bytes. The remainder of the copy back is the kmemdup()ed image of the caller's buffer, so a device answering with a short data stage leaves the trailing words of buf[] holding leftover kernel stack. The only guard in the caller is err < 0, so those words are stored into status[]. They then reach user space: snd_rme_digiface_get_status_val() selects a 16-bit halfword of status[] per the control's reg/mask, and the eight Digiface status controls together expose the whole 16-byte frame to an unprivileged reader of /dev/snd/controlC*. Zero-initialise the buffer so a short read yields zeros instead of stack residue. This mirrors snd_rme_get_status1(), which already clears its output word be",
    "evidence": "osv:CVE-2026-74500",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.12.103",
            "evidence": "/affected/1/ranges"
          },
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            "value": "6.18.44",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.1.8",
            "evidence": "/affected/1/ranges"
          }
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        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-74500",
      "aliases": [
        "CVE-2026-74500"
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-08T02:51:54.186346142Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/441aaad150c57edaf57ee482a79a3bf4c5b7e353",
        "https://git.kernel.org/stable/c/7ba01e0d3539d9cf0aef3e82938f1648147744cc",
        "https://git.kernel.org/stable/c/98dbfbb38e297c25c5b0af4a9018d71ac25e8554",
        "https://git.kernel.org/stable/c/b3a346d5c99dd73cf84711f2a43e42691990efd2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74500.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74500",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74500.json"
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    "related_cves": [
      {
        "value": "CVE-2026-74500",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 98356,
  "published_at": "2026-08-15T12:27:26.359+00:00"
}