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GHSA-WM2G-6M3R-4FX9

Vulnerability from github – Published: 2025-07-28 12:30 – Updated: 2026-01-07 18:30
VLAI
Details

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

comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large

The handling of the COMEDI_INSNLIST ioctl allocates a kernel buffer to hold the array of struct comedi_insn, getting the length from the n_insns member of the struct comedi_insnlist supplied by the user. The allocation will fail with a WARNING and a stack dump if it is too large.

Avoid that by failing with an -EINVAL error if the supplied n_insns value is unreasonable.

Define the limit on the n_insns value in the MAX_INSNS macro. Set this to the same value as MAX_SAMPLES (65536), which is the maximum allowed sum of the values of the member n in the array of struct comedi_insn, and sensible comedi instructions will have an n of at least 1.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2025-38481"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-28T12:15:29Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large\n\nThe handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to\nhold the array of `struct comedi_insn`, getting the length from the\n`n_insns` member of the `struct comedi_insnlist` supplied by the user.\nThe allocation will fail with a WARNING and a stack dump if it is too\nlarge.\n\nAvoid that by failing with an `-EINVAL` error if the supplied `n_insns`\nvalue is unreasonable.\n\nDefine the limit on the `n_insns` value in the `MAX_INSNS` macro.  Set\nthis to the same value as `MAX_SAMPLES` (65536), which is the maximum\nallowed sum of the values of the member `n` in the array of `struct\ncomedi_insn`, and sensible comedi instructions will have an `n` of at\nleast 1.",
  "id": "GHSA-wm2g-6m3r-4fx9",
  "modified": "2026-01-07T18:30:18Z",
  "published": "2025-07-28T12:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38481"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/08ae4b20f5e82101d77326ecab9089e110f224cc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/454d732dfd0aef7d7aa950c409215ca06d717e93"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/69dc06b9514522de532e997a21d035cd29b0db44"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/992d600f284e719242a434166e86c1999649b71c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c68257588e87f45530235701a42496b7e9e56adb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c9d3d9667443caafa804cd07940aeaef8e53aa90"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3b8322cc8081d142ee4c1a43e1d702bdba1ed76"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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