CVE-2026-68182 (GCVE-0-2026-68182)
Vulnerability from cvelistv5
Published
2026-08-10 11:59
Modified
2026-08-19 16:30
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: comedi_parport: deal with premature interrupt Syzbot reported a general protection fault in `comedi_get_is_subdevice_running()`, which was called from the interrupt handler `parport_interrupt()` in the "comedi_parport" driver, but it does not currently have a C reproducer for the problem. It's probably due to a premature interrupt for one of two reasons: 1. The driver sets up the interrupt handler before the comedi subdevices used by the interrupt handler have been allocated, but does not disable the interrupt in the parallel port's CTRL register first. 2. The driver uses a user-supplied I/O port base address which Syzbot would have supplied, but it might not be backed by real parallel port hardware. Change the initialization order in the driver's comedi "attach" handler (`parport_attach()`) so that the hardware registers are initialized before the interrupt handler is requested. This should prevent premature interrupts occurring for real hardware. Also add a test to the interrupt handler to ensure the comedi device is fully attached and return early if it isn't.
References
Impacted products
Vendor Product Version
Linux Linux Version: 241ab6ad7108e51c67881f7881c5e46f0400cdb1
Version: 241ab6ad7108e51c67881f7881c5e46f0400cdb1
Version: 241ab6ad7108e51c67881f7881c5e46f0400cdb1
Version: 241ab6ad7108e51c67881f7881c5e46f0400cdb1
Version: 241ab6ad7108e51c67881f7881c5e46f0400cdb1
Version: 241ab6ad7108e51c67881f7881c5e46f0400cdb1
Version: 241ab6ad7108e51c67881f7881c5e46f0400cdb1
Version: 241ab6ad7108e51c67881f7881c5e46f0400cdb1
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{
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: comedi_parport: deal with premature interrupt\n\nSyzbot reported a general protection fault in\n`comedi_get_is_subdevice_running()`, which was called from the interrupt\nhandler `parport_interrupt()` in the \"comedi_parport\" driver, but it\ndoes not currently have a C reproducer for the problem.  It\u0027s\nprobably due to a premature interrupt for one of two reasons:\n\n1. The driver sets up the interrupt handler before the comedi subdevices\n   used by the interrupt handler have been allocated, but does not\n   disable the interrupt in the parallel port\u0027s CTRL register first.\n2. The driver uses a user-supplied I/O port base address which Syzbot\n   would have supplied, but it might not be backed by real parallel port\n   hardware.\n\nChange the initialization order in the driver\u0027s comedi \"attach\" handler\n(`parport_attach()`) so that the hardware registers are initialized\nbefore the interrupt handler is requested.  This should prevent\npremature interrupts occurring for real hardware.\n\nAlso add a test to the interrupt handler to ensure the comedi device is\nfully attached and return early if it isn\u0027t."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:30:47.491Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6ed34611e569fc1a1169905c5228fd0eb2806c1b"
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        {
          "url": "https://git.kernel.org/stable/c/48ef18e5eb6b8a9c546038b2ab89a841fcd97fe7"
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        {
          "url": "https://git.kernel.org/stable/c/a88b25db815ff6edace81b0bb0f4a201133bd215"
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        {
          "url": "https://git.kernel.org/stable/c/b061bb4dca49fd93063359d3805387235818778c"
        },
        {
          "url": "https://git.kernel.org/stable/c/086a9ae3c5df63ec11033a8c0b3f6a1fd295ddd1"
        },
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          "url": "https://git.kernel.org/stable/c/cf26dd2d841583c54a87005c4934b92fddb930c3"
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          "url": "https://git.kernel.org/stable/c/5d059ce0e6a2f6f8b97273499d47b8f917097b48"
        },
        {
          "url": "https://git.kernel.org/stable/c/17221216ae8ce6a24e8a4e787382e3ebc81b88a8"
        }
      ],
      "title": "comedi: comedi_parport: deal with premature interrupt",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68182",
    "datePublished": "2026-08-10T11:59:53.793Z",
    "dateReserved": "2026-07-30T09:28:09.373Z",
    "dateUpdated": "2026-08-19T16:30:47.491Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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