ghsa-w37r-fw6v-6v39
Vulnerability from github
Published
2025-07-28 12:30
Modified
2025-07-28 12:30
Details

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

comedi: das16m1: Fix bit shift out of bounds

When checking for a supported IRQ number, the following test is used:

/* only irqs 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, and 15 are valid */
if ((1 << it->options[1]) & 0xdcfc) {

However, it->options[i] is an unchecked int value from userspace, so the shift amount could be negative or out of bounds. Fix the test by requiring it->options[1] to be within bounds before proceeding with the original test.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38483"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-28T12:15:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: das16m1: Fix bit shift out of bounds\n\nWhen checking for a supported IRQ number, the following test is used:\n\n\t/* only irqs 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, and 15 are valid */\n\tif ((1 \u003c\u003c it-\u003eoptions[1]) \u0026 0xdcfc) {\n\nHowever, `it-\u003eoptions[i]` is an unchecked `int` value from userspace, so\nthe shift amount could be negative or out of bounds.  Fix the test by\nrequiring `it-\u003eoptions[1]` to be within bounds before proceeding with\nthe original test.",
  "id": "GHSA-w37r-fw6v-6v39",
  "modified": "2025-07-28T12:30:35Z",
  "published": "2025-07-28T12:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38483"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/076b13ee60eb01ed0d140ef261f95534562a3077"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65c03e6fc524eb2868abedffd8a4613d78abc288"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/adb7df8a8f9d788423e161b779764527dd3ec2d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed93c6f68a3be06e4e0c331c6e751f462dee3932"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f211572818ed5bec2b3f5d4e0719ef8699b3c269"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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