{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31756",
  "modified": "2026-10-07T14:35:31Z",
  "upstream": [
    "CVE-2026-31756"
  ],
  "published": "2026-05-01T14:17:31Z",
  "summary": "usb: dwc2: gadget: Fix spin_lock/unlock mismatch in dwc2_hsotg_udc_stop()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc2: gadget: Fix spin_lock/unlock mismatch in dwc2_hsotg_udc_stop()\n\ndwc2_gadget_exit_clock_gating() internally calls call_gadget() macro,\nwhich expects hsotg->lock to be held since it does spin_unlock/spin_lock\naround the gadget driver callback invocation.\n\nHowever, dwc2_hsotg_udc_stop() calls dwc2_gadget_exit_clock_gating()\nwithout holding the lock. This leads to:\n - spin_unlock on a lock that is not held (undefined behavior)\n - The lock remaining held after dwc2_gadget_exit_clock_gating() returns,\n   causing a deadlock when spin_lock_irqsave() is called later in the\n   same function.\n\nFix this by acquiring hsotg->lock before calling\ndwc2_gadget_exit_clock_gating() and releasing it afterwards, which\nsatisfies the locking requirement of the call_gadget() macro.",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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        "ecosystem": "Raspberry Pi OS:13",
        "name": "linux"
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31756"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e9fcca3e87463013d595c65c2189ffaa32ad3b50"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8ffe31acb3b77a30ae34d01719a269881569fb7f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/beab10429439e20708036a66fb0d97ffb79da6a1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/61937f686290494998236c680ce0836b8dd63a3f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/51b62286fc668c6eb74dee7624ec0beec3c5a0ed"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-24T06:48:58Z"
  }
}