ghsa-j2mv-rj6m-hq85
Vulnerability from github
Published
2025-08-16 12:30
Modified
2025-08-16 12:30
Details

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

comedi: pcl812: Fix bit shift out of bounds

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

if ((1 << it->options[1]) & board->irq_bits) {

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. Valid it->options[1] values that select the IRQ will be in the range [1,15]. The value 0 explicitly disables the use of interrupts.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38530"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-16T12:15:28Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: pcl812: Fix bit shift out of bounds\n\nWhen checking for a supported IRQ number, the following test is used:\n\n\tif ((1 \u003c\u003c it-\u003eoptions[1]) \u0026 board-\u003eirq_bits) {\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.  Valid `it-\u003eoptions[1]` values that select the IRQ\nwill be in the range [1,15]. The value 0 explicitly disables the use of\ninterrupts.",
  "id": "GHSA-j2mv-rj6m-hq85",
  "modified": "2025-08-16T12:30:32Z",
  "published": "2025-08-16T12:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38530"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16c173abee315953fd17a279352fec4a1faee862"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5bfa301e1e59a9b1a7b62a800b54852337c97416"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e470d8efd10725b189ca8951973a8425932398a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a27e27eee313fe1c450b6af1e80e64412546cab4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b14b076ce593f72585412fc7fd3747e03a5e3632"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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