CVE-2026-43340 (GCVE-0-2026-43340)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:37 – Updated: 2026-05-08 13:37
VLAI?
Title
comedi: Reinit dev->spinlock between attachments to low-level drivers
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 3181c34b415c5464be9d34bff3e43ef63b747039 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 2b1f49e4fdff3ef0f8e9158bbb5b149e06287560 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 4d5ffe524903a30e2e0da7d16841a56bec2de55c (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < c01bcc67a9a692d65508ebd480405b5e77d562b7 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 430291d8f3884f57ae0057049b0ca291453e29e1 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < b89c026227712c367950bbae055a5b31073d3b30 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 83134a7a176ce5b4b19b6edecf4360e8d98d1a5a (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 4b9a9a6d71e3e252032f959fb3895a33acb5865c (git)
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    Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "drivers/comedi/drivers.c"
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          "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": "2026-05-08T13:37:18.580Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-05-08T13:37:18.580Z",
    "dateReserved": "2026-05-01T14:12:56.003Z",
    "dateUpdated": "2026-05-08T13:37:18.580Z",
    "state": "PUBLISHED"
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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