CVE-2026-43340 (GCVE-0-2026-43340)
Vulnerability from cvelistv5
Published
2026-05-08 13:37
Modified
2026-05-11 22:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: Reinit dev->spinlock between attachments to low-level drivers `struct comedi_device` is the main controlling structure for a COMEDI device created by the COMEDI subsystem. It contains a member `spinlock` containing a spin-lock that is initialized by the COMEDI subsystem, but is reserved for use by a low-level driver attached to the COMEDI device (at least since commit 25436dc9d84f ("Staging: comedi: remove RT code")). Some COMEDI devices (those created on initialization of the COMEDI subsystem when the "comedi.comedi_num_legacy_minors" parameter is non-zero) can be attached to different low-level drivers over their lifetime using the `COMEDI_DEVCONFIG` ioctl command. This can result in inconsistent lock states being reported when there is a mismatch in the spin-lock locking levels used by each low-level driver to which the COMEDI device has been attached. Fix it by reinitializing `dev->spinlock` before calling the low-level driver's `attach` function pointer if `CONFIG_LOCKDEP` is enabled.
References
Impacted products
Vendor Product Version
Linux Linux Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/comedi/drivers.c"
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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: Reinit dev-\u003espinlock between attachments to low-level drivers\n\n`struct comedi_device` is the main controlling structure for a COMEDI\ndevice created by the COMEDI subsystem.  It contains a member `spinlock`\ncontaining a spin-lock that is initialized by the COMEDI subsystem, but\nis reserved for use by a low-level driver attached to the COMEDI device\n(at least since commit 25436dc9d84f (\"Staging: comedi: remove RT\ncode\")).\n\nSome COMEDI devices (those created on initialization of the COMEDI\nsubsystem when the \"comedi.comedi_num_legacy_minors\" parameter is\nnon-zero) can be attached to different low-level drivers over their\nlifetime using the `COMEDI_DEVCONFIG` ioctl command.  This can result in\ninconsistent lock states being reported when there is a mismatch in the\nspin-lock locking levels used by each low-level driver to which the\nCOMEDI device has been attached.  Fix it by reinitializing\n`dev-\u003espinlock` before calling the low-level driver\u0027s `attach` function\npointer if `CONFIG_LOCKDEP` is enabled."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:22:40.639Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3181c34b415c5464be9d34bff3e43ef63b747039"
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        {
          "url": "https://git.kernel.org/stable/c/2b1f49e4fdff3ef0f8e9158bbb5b149e06287560"
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          "url": "https://git.kernel.org/stable/c/4d5ffe524903a30e2e0da7d16841a56bec2de55c"
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          "url": "https://git.kernel.org/stable/c/c01bcc67a9a692d65508ebd480405b5e77d562b7"
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          "url": "https://git.kernel.org/stable/c/430291d8f3884f57ae0057049b0ca291453e29e1"
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        },
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          "url": "https://git.kernel.org/stable/c/83134a7a176ce5b4b19b6edecf4360e8d98d1a5a"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b9a9a6d71e3e252032f959fb3895a33acb5865c"
        }
      ],
      "title": "comedi: Reinit dev-\u003espinlock between attachments to low-level drivers",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43340",
    "datePublished": "2026-05-08T13:37:18.580Z",
    "dateReserved": "2026-05-01T14:12:56.003Z",
    "dateUpdated": "2026-05-11T22:22:40.639Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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