CVE-2026-74500 (GCVE-0-2026-74500)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-08-17 05:20
Severity ?
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 before the same kind of vendor read. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
References
Impacted products
Vendor Product Version
Linux Linux Version: 611a96f6acf2e74fe28cb90908a9c183862348ce
Version: 611a96f6acf2e74fe28cb90908a9c183862348ce
Version: 611a96f6acf2e74fe28cb90908a9c183862348ce
Version: 611a96f6acf2e74fe28cb90908a9c183862348ce
Version: 3089703ab71484a8b9a7641051181d11d60f870c
Version: 50f63f11a6ddaa0d34574df72b3fa6ee257c057d
Version: 6.10.14   ≤
Version: 6.11.3   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/mixer_quirks.c"
          ],
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/mixer_quirks.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix stack info leak in RME Digiface status\n\nsnd_rme_digiface_read_status() reads a four-word status block from the\ndevice into an uninitialised on-stack __le32 buf[4] and, whenever the\nvendor control-IN transfer does not return a negative error, copies all\nfour words into the caller\u0027s status[].\n\nsnd_usb_ctl_msg() copies the full requested size back into the caller\u0027s\nbuffer regardless of how many bytes the data stage actually delivered:\n\n\tbuf = kmemdup(data, size, GFP_KERNEL);\n\terr = usb_control_msg(dev, pipe, request, requesttype,\n\t\t\t      value, index, buf, size, timeout);\n\tmemcpy(data, buf, size);\n\nusb_control_msg() returns the transferred length on a short control-IN,\nwhich is a non-negative value, and writes only that many bytes.  The\nremainder of the copy back is the kmemdup()ed image of the caller\u0027s\nbuffer, so a device answering with a short data stage leaves the\ntrailing words of buf[] holding leftover kernel stack.  The only guard\nin the caller is err \u003c 0, so those words are stored into status[].\n\nThey then reach user space: snd_rme_digiface_get_status_val() selects a\n16-bit halfword of status[] per the control\u0027s reg/mask, and the eight\nDigiface status controls together expose the whole 16-byte frame to an\nunprivileged reader of /dev/snd/controlC*.\n\nZero-initialise the buffer so a short read yields zeros instead of stack\nresidue.  This mirrors snd_rme_get_status1(), which already clears its\noutput word before the same kind of vendor read.\n\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:20:38.636Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b3a346d5c99dd73cf84711f2a43e42691990efd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ba01e0d3539d9cf0aef3e82938f1648147744cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/98dbfbb38e297c25c5b0af4a9018d71ac25e8554"
        },
        {
          "url": "https://git.kernel.org/stable/c/441aaad150c57edaf57ee482a79a3bf4c5b7e353"
        }
      ],
      "title": "ALSA: usb-audio: fix stack info leak in RME Digiface status",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74500",
    "datePublished": "2026-08-15T12:27:26.359Z",
    "dateReserved": "2026-08-15T05:44:03.907Z",
    "dateUpdated": "2026-08-17T05:20:38.636Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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