{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38478",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-38478"
  ],
  "published": "2025-07-28T11:22:31Z",
  "summary": "comedi: Fix initialization of data for instructions that write to subdevice",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: Fix initialization of data for instructions that write to subdevice\n\nSome Comedi subdevice instruction handlers are known to access\ninstruction data elements beyond the first `insn->n` elements in some\ncases.  The `do_insn_ioctl()` and `do_insnlist_ioctl()` functions\nallocate at least `MIN_SAMPLES` (16) data elements to deal with this,\nbut they do not initialize all of that.  For Comedi instruction codes\nthat write to the subdevice, the first `insn->n` data elements are\ncopied from user-space, but the remaining elements are left\nuninitialized.  That could be a problem if the subdevice instruction\nhandler reads the uninitialized data.  Ensure that the first\n`MIN_SAMPLES` elements are initialized before calling these instruction\nhandlers, filling the uncopied elements with 0.  For\n`do_insnlist_ioctl()`, the same data buffer elements are used for\nhandling a list of instructions, so ensure the first `MIN_SAMPLES`\nelements are initialized for each instruction that writes to the\nsubdevice.",
  "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": "6.1.147",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38478"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6f38c6380c3b38a05032b8881e41137385a6ce02"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/13e4d9038a1e869445a996a3f604a84ef52fe8f4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/020eed5681d0f9bced73970368078a92d6cfaa9c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d3436638738ace8f101af7bdee2eae1bc38e9b29"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/673ee92bd2d31055bca98a1d96b653f5284289c4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c42116dc70af6664526f7aa82cf937824ab42649"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/46d8c744136ce2454aa4c35c138cc06817f92b8e"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
  }
}