GHSA-CXCR-VPH9-WV8J

Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-15 21:31
VLAI
Details

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
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-2026-43340"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-08T14:16:43Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-cxcr-vph9-wv8j",
  "modified": "2026-05-15T21:31:31Z",
  "published": "2026-05-08T15:31:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43340"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b1f49e4fdff3ef0f8e9158bbb5b149e06287560"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3181c34b415c5464be9d34bff3e43ef63b747039"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/430291d8f3884f57ae0057049b0ca291453e29e1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b9a9a6d71e3e252032f959fb3895a33acb5865c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d5ffe524903a30e2e0da7d16841a56bec2de55c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83134a7a176ce5b4b19b6edecf4360e8d98d1a5a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b89c026227712c367950bbae055a5b31073d3b30"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c01bcc67a9a692d65508ebd480405b5e77d562b7"
    }
  ],
  "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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