GHSA-JGC9-FR2G-9R52

Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-05-07 21:30
VLAI
Details

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

comedi: ni_atmio16d: Fix invalid clean-up after failed attach

If the driver's COMEDI "attach" handler function (atmio16d_attach()) returns an error, the COMEDI core will call the driver's "detach" handler function (atmio16d_detach()) to clean up. This calls reset_atmio16d() unconditionally, but depending on where the error occurred in the attach handler, the device may not have been sufficiently initialized to call reset_atmio16d(). It uses dev->iobase as the I/O port base address and dev->private as the pointer to the COMEDI device's private data structure. dev->iobase may still be set to its initial value of 0, which would result in undesired writes to low I/O port addresses. dev->private may still be NULL, which would result in null pointer dereferences.

Fix atmio16d_detach() by checking that dev->private is valid (non-null) before calling reset_atmio16d(). This implies that dev->iobase was set correctly since that is set up before dev->private.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-31749"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-01T15:16:37Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: ni_atmio16d: Fix invalid clean-up after failed attach\n\nIf the driver\u0027s COMEDI \"attach\" handler function (`atmio16d_attach()`)\nreturns an error, the COMEDI core will call the driver\u0027s \"detach\"\nhandler function (`atmio16d_detach()`) to clean up.  This calls\n`reset_atmio16d()` unconditionally, but depending on where the error\noccurred in the attach handler, the device may not have been\nsufficiently initialized to call `reset_atmio16d()`.  It uses\n`dev-\u003eiobase` as the I/O port base address and `dev-\u003eprivate` as the\npointer to the COMEDI device\u0027s private data structure.  `dev-\u003eiobase`\nmay still be set to its initial value of 0, which would result in\nundesired writes to low I/O port addresses.  `dev-\u003eprivate` may still be\n`NULL`, which would result in null pointer dereferences.\n\nFix `atmio16d_detach()` by checking that `dev-\u003eprivate` is valid\n(non-null) before calling `reset_atmio16d()`.  This implies that\n`dev-\u003eiobase` was set correctly since that is set up before\n`dev-\u003eprivate`.",
  "id": "GHSA-jgc9-fr2g-9r52",
  "modified": "2026-05-07T21:30:23Z",
  "published": "2026-05-01T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31749"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/101ab946b79ad83b36d5cfd47de587492a80acf0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d8d88c8c0eec230de8f1f60e0920a4337939a88"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/933a2d6a95f9bfb203e562c9be1dd990c735535c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a01dd339ea6ac58b0967a50085622a6017351140"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d07d97ca4f7fac467cdcf4a012690853958b7e89"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f517646e008fe99ca1800601cd011b110f8684ae"
    }
  ],
  "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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