USB: dummy-hcd: Fix interrupt synchronization error

{
  "id": "cc3241c023a0b892f844845690d86dfa8f50e012816ad212920d3216d0552017",
  "url": "https://osv.dev/vulnerability/CVE-2026-43324",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "USB: dummy-hcd: Fix interrupt synchronization error",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: USB: dummy-hcd: Fix interrupt synchronization error This fixes an error in synchronization in the dummy-hcd driver. The error has a somewhat involved history. The synchronization mechanism was introduced by commit 7dbd8f4cabd9 (\"USB: dummy-hcd: Fix erroneous synchronization change\"), which added an emulated \"interrupts enabled\" flag together with code emulating synchronize_irq() (it waits until all current handler callbacks have returned). But the emulated interrupt-disable occurred too late, after the driver containing the handler callback routines had been told that it was unbound and no more callbacks would occur. Commit 4a5d797a9f9c (\"usb: gadget: dummy_hcd: fix gpf in gadget_setup\") tried to fix this by moving the synchronize_irq() emulation code from dummy_stop() to dummy_pullup(), which runs before the unbind callback. There still were races, though, because the emulated interrupt-disable still occurred too late. It couldn't be moved to dummy_pullup(), because that routine can be called for reasons other than an impending unbind. Therefore commits 7dc0c55e9f30 (\"USB: UDC core: Add udc_async_callbacks gadget op\") and 04145a03db9d (\"USB: UDC: Implement udc_async_callbacks in dummy-hcd\") added an API allowing the UDC core to tell dummy-hcd exactly when emulated interrupts and their callbacks should be disabled. That brings us to the current state of things, which is still wrong because the emulated synchr",
    "evidence": "osv:CVE-2026-43324",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.15.203",
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        "affected_versions": []
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    "severity": "high",
    "structured": {
      "id": "CVE-2026-43324",
      "aliases": [
        "CVE-2026-43324"
      ],
      "metrics": [
        {
          "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": "2026-10-28T02:30:50.840596539Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2ca9e46f8f1f5a297eb0ac83f79d35d5b3a02541",
        "https://git.kernel.org/stable/c/5687a09776069bd915560021c9728ca528440128",
        "https://git.kernel.org/stable/c/5aa776c8615bea3b1eaeec87b0788375800ead4f",
        "https://git.kernel.org/stable/c/8bcd80219d8e10e660bf29b20e41bb8beb4e4cb7",
        "https://git.kernel.org/stable/c/94d4fab1dd9e64f45449bcc7d6a5acf796b13015",
        "https://git.kernel.org/stable/c/cbf7df5e5d27cd5bea92ee9a75a4b28dbcc718d4",
        "https://git.kernel.org/stable/c/d847f375b1bcea713143bc02720d13d2d01b012a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43324.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-43324",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43324.json"
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519119,
  "published_at": "2026-05-08T13:31:08.85+00:00"
}