{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-68753",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-68753"
  ],
  "published": "2026-01-05T09:32:59Z",
  "summary": "ALSA: firewire-motu: add bounds check in put_user loop for DSP events",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: firewire-motu: add bounds check in put_user loop for DSP events\n\nIn the DSP event handling code, a put_user() loop copies event data.\nWhen the user buffer size is not aligned to 4 bytes, it could overwrite\nbeyond the buffer boundary.\n\nFix by adding a bounds check before put_user().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.160",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-68753"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ea2c921d9de6e32ca50cb817b9d57bb881be70de"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6d4f17782ce4facf3197e79707df411ee3d7b30a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0d71b3c2ed742f1ccb3b0b7a61afb90c0251093f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/df692cf2b601a54b34edfdb9e683d67483aa8ce1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8f9e51cf2a2a43d0cd72d3dc0b5ccea3f639c187"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/298e753880b6ea99ac30df34959a7a03b0878eed"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The flaw is reached through a local read() on the MOTU ALSA hwdep device; there is no network-receive path, although a supported FireWire unit must be attached and streaming.\nAC:L - The caller can deterministically trigger the overrun by supplying a count greater than the 8-byte header but not divisible by four while a DSP event is queued. No race or condition outside the attacker's control is required.\nPR:L - No capability or authentication check exists in the hwdep path; the attacker only needs ordinary user access to the sound device, commonly granted through an active-seat ACL or audio-group membership.\nUI:N - The attacker can open the hwdep and PCM devices, start streaming, and issue the malformed read without action by another user.\nS:U - The overwrite affects memory associated with the local consuming process and does not cross a VM, IOMMU, container, or other security-authority boundary.\nC:N - The vulnerable operation only writes an initialized DSP event to userspace; it performs no out-of-bounds read and provides no kernel-memory disclosure primitive.\nI:H - The loop can write a complete 32-bit, device-influenced event when only one to three bytes remain, corrupting adjacent userspace control data. Under the required higher-severity treatment for an out-of-bounds write, integrity impact is High.\nA:H - The adjacent-memory corruption can terminate the consuming process or a critical audio or control service and can be triggered repeatedly. Under the required higher-severity treatment for any crash, availability impact is High."
    }
  }
}