dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()

{
  "id": "e556f22f40627ef429bf625cbf9ba525618689e63eab05efc583d1402dbff920",
  "url": "https://osv.dev/vulnerability/CVE-2026-74574",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open() The failed_dev_add and failed_dev_name paths drop the file-device reference while wq->wq_lock is still held. If put_device(fdev) drops the last reference, idxd_file_dev_release() runs synchronously and tries to take wq->wq_lock again, deadlocking. Those paths also fall through into the later ctx cleanup labels even though idxd_file_dev_release() owns that cleanup and frees ctx. This can make idxd_xa_pasid_remove(ctx) and kfree(ctx) operate on a freed context. Move idxd_wq_get() before file-device setup can fail, since the release callback always calls idxd_wq_put(). Then unlock wq->wq_lock before put_device(fdev) and return directly from the file-device setup failure path, leaving ctx cleanup to the release callback.",
    "evidence": "osv:CVE-2026-74574",
    "products": [
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        "prerequisites": [],
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    "severity": "high",
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      "id": "CVE-2026-74574",
      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      "modified": "2026-10-28T02:30:21.903793111Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0679c0c189d2548f00e1bac95be28e2df5c6c7f7",
        "https://git.kernel.org/stable/c/6e26a41c4c1a706edaaa7c7dffc6b3b945707a55",
        "https://git.kernel.org/stable/c/778ccbded2c8749c5be7f0dfa04fc9977a36fb7e",
        "https://git.kernel.org/stable/c/8d5d28285728be47c82fdf1c48be4268293c90e7",
        "https://git.kernel.org/stable/c/ee1d7274102285d78a53161fc705a8d8cd40b066",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74574.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74574",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 488298,
  "published_at": "2026-08-15T12:28:12.558+00:00"
}