CVE-2026-31756 (GCVE-0-2026-31756)
Vulnerability from cvelistv5
Published
2026-05-01 14:14
Modified
2026-05-01 14:14
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In 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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 5cb3cb3db317c58d50b68f3ca3bb8343ea9d1acd Version: 1ac826cebc2776f91569f2aa9c9c3da2375d2096 Version: 41732f9febdccb4f9b87c13cb915d717d68ccafd Version: ba78c2b3254c4a458c01776612e8a573e12f8d26 Version: af076a41f8a28faf9ceb9dd2d88aef2c202ef39a Version: af076a41f8a28faf9ceb9dd2d88aef2c202ef39a Version: af076a41f8a28faf9ceb9dd2d88aef2c202ef39a Version: b39c203690fa1678daecc60f347e43c8b593b969 |
||
{
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"version": "0",
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{
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"status": "unaffected",
"version": "5.15.203",
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},
{
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"version": "6.1.168",
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{
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"status": "unaffected",
"version": "6.6.134",
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{
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"version": "6.12.81",
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{
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{
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"version": "7.0",
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],
"cpeApplicability": [
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],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-01T14:14:47.000Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/e9fcca3e87463013d595c65c2189ffaa32ad3b50"
},
{
"url": "https://git.kernel.org/stable/c/8ffe31acb3b77a30ae34d01719a269881569fb7f"
},
{
"url": "https://git.kernel.org/stable/c/beab10429439e20708036a66fb0d97ffb79da6a1"
},
{
"url": "https://git.kernel.org/stable/c/4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4"
},
{
"url": "https://git.kernel.org/stable/c/61937f686290494998236c680ce0836b8dd63a3f"
},
{
"url": "https://git.kernel.org/stable/c/51b62286fc668c6eb74dee7624ec0beec3c5a0ed"
},
{
"url": "https://git.kernel.org/stable/c/9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a"
}
],
"title": "usb: dwc2: gadget: Fix spin_lock/unlock mismatch in dwc2_hsotg_udc_stop()",
"x_generator": {
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}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-31756",
"datePublished": "2026-05-01T14:14:47.000Z",
"dateReserved": "2026-03-09T15:48:24.139Z",
"dateUpdated": "2026-05-01T14:14:47.000Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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