FKIE_CVE-2026-31749

Vulnerability from fkie_nvd - Published: 2026-05-01 15:16 - Updated: 2026-05-01 15:24
Severity ?
Summary
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`.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/101ab946b79ad83b36d5cfd47de587492a80acf0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d8d88c8c0eec230de8f1f60e0920a4337939a88
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/933a2d6a95f9bfb203e562c9be1dd990c735535c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a01dd339ea6ac58b0967a50085622a6017351140
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d07d97ca4f7fac467cdcf4a012690853958b7e89
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f517646e008fe99ca1800601cd011b110f8684ae
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-31749",
  "lastModified": "2026-05-01T15:24:14.893",
  "metrics": {},
  "published": "2026-05-01T15:16:37.723",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/101ab946b79ad83b36d5cfd47de587492a80acf0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5d8d88c8c0eec230de8f1f60e0920a4337939a88"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/933a2d6a95f9bfb203e562c9be1dd990c735535c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a01dd339ea6ac58b0967a50085622a6017351140"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d07d97ca4f7fac467cdcf4a012690853958b7e89"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f517646e008fe99ca1800601cd011b110f8684ae"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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