CVE-2026-31756 (GCVE-0-2026-31756)
Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-23 16:05
VLAI
EPSS
VEX
Title
usb: dwc2: gadget: Fix spin_lock/unlock mismatch in dwc2_hsotg_udc_stop()
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.
Severity
5.5 (Medium)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
5cb3cb3db317c58d50b68f3ca3bb8343ea9d1acd , < e9fcca3e87463013d595c65c2189ffaa32ad3b50
(git)
Affected: 1ac826cebc2776f91569f2aa9c9c3da2375d2096 , < 8ffe31acb3b77a30ae34d01719a269881569fb7f (git) Affected: 41732f9febdccb4f9b87c13cb915d717d68ccafd , < beab10429439e20708036a66fb0d97ffb79da6a1 (git) Affected: ba78c2b3254c4a458c01776612e8a573e12f8d26 , < 4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4 (git) Affected: af076a41f8a28faf9ceb9dd2d88aef2c202ef39a , < 61937f686290494998236c680ce0836b8dd63a3f (git) Affected: af076a41f8a28faf9ceb9dd2d88aef2c202ef39a , < 51b62286fc668c6eb74dee7624ec0beec3c5a0ed (git) Affected: af076a41f8a28faf9ceb9dd2d88aef2c202ef39a , < 9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a (git) Affected: b39c203690fa1678daecc60f347e43c8b593b969 (git) Affected: 5.15.187 , < 5.15.203 (semver) Affected: 6.1.143 , < 6.1.168 (semver) Affected: 6.6.96 , < 6.6.134 (semver) Affected: 6.12.36 , < 6.12.81 (semver) Affected: 6.15.5 , < 6.16 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.16
Unaffected: 0 , < 6.16 (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T11:37:21+00:00",
"cve": "CVE-2026-31756",
"id": "CVE-2026-31756",
"initial_release_date": "2026-05-01T00:00:00+00:00",
"product_status:known_affected": "76",
"product_status:known_not_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: usb: dwc2: gadget: Fix spin_lock/unlock mismatch in dwc2_hsotg_udc_stop()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31756.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-28T01:27:10Z",
"cve": "CVE-2026-31756",
"id": "CVE-2026-31756",
"initial_release_date": "2026-05-06T01:43:04Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "424",
"product_status:known_not_affected": "202",
"product_status:recommended": "265",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-31756",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31756.json",
"version": "7"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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