GHSA-R5FX-27QQ-PWQG
Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-05-01 15:30In the Linux kernel, the following vulnerability has been resolved:
usb: dwc2: gadget: Fix spin_lock/unlock mismatch in dwc2_hsotg_udc_stop()
dwc2_gadget_exit_clock_gating() internally calls call_gadget() macro, which expects hsotg->lock to be held since it does spin_unlock/spin_lock around the gadget driver callback invocation.
However, dwc2_hsotg_udc_stop() calls dwc2_gadget_exit_clock_gating() without holding the lock. This leads to: - spin_unlock on a lock that is not held (undefined behavior) - The lock remaining held after dwc2_gadget_exit_clock_gating() returns, causing a deadlock when spin_lock_irqsave() is called later in the same function.
Fix this by acquiring hsotg->lock before calling dwc2_gadget_exit_clock_gating() and releasing it afterwards, which satisfies the locking requirement of the call_gadget() macro.
{
"affected": [],
"aliases": [
"CVE-2026-31756"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-01T15:16:38Z",
"severity": null
},
"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-\u003elock 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-\u003elock before calling\ndwc2_gadget_exit_clock_gating() and releasing it afterwards, which\nsatisfies the locking requirement of the call_gadget() macro.",
"id": "GHSA-r5fx-27qq-pwqg",
"modified": "2026-05-01T15:30:35Z",
"published": "2026-05-01T15:30:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31756"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/51b62286fc668c6eb74dee7624ec0beec3c5a0ed"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/61937f686290494998236c680ce0836b8dd63a3f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8ffe31acb3b77a30ae34d01719a269881569fb7f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/beab10429439e20708036a66fb0d97ffb79da6a1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e9fcca3e87463013d595c65c2189ffaa32ad3b50"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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