Medium 5.5Published May 1, 2026

CVE-2026-31756usb: dwc2: gadget: Fix spin_lock/unlock mismatch in dwc2_hsotg_udc_stop()

Updated under an hour ago (Oct 27, 2026, 10:40 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 5cb3cb3db317c58d50b68f3ca3bb8343ea9d1acd before e9fcca3e87463013d595c65c2189ffaa32ad3b50; from 1ac826cebc2776f91569f2aa9c9c3da2375d2096 before 8ffe31acb3b77a30ae34d01719a269881569fb7f; from 41732f9febdccb4f9b87c13cb915d717d68ccafd before beab10429439e20708036a66fb0d97ffb79da6a1; from ba78c2b3254c4a458c01776612e8a573e12f8d26 before 4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4; from af076a41f8a28faf9ceb9dd2d88aef2c202ef39a before 61937f686290494998236c680ce0836b8dd63a3f; from af076a41f8a28faf9ceb9dd2d88aef2c202ef39a before 51b62286fc668c6eb74dee7624ec0beec3c5a0ed; from af076a41f8a28faf9ceb9dd2d88aef2c202ef39a before 9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a; b39c203690fa1678daecc60f347e43c8b593b969; and 5 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 5.15.187 before 5.15.203; from 6.1.143 before 6.1.168; from 6.6.96 before 6.6.134; from 6.12.36 before 6.12.81; from 6.15.5 before 6.18.22; from 6.19 before 6.19.12; 7.0; 7.0; and 5 more ranges	NVD

References

References

https://git.kernel.org/stable/c/e9fcca3e87463013d595c65c2189ffaa32ad3b50	patch
https://git.kernel.org/stable/c/8ffe31acb3b77a30ae34d01719a269881569fb7f	patch
https://git.kernel.org/stable/c/beab10429439e20708036a66fb0d97ffb79da6a1	patch
https://git.kernel.org/stable/c/4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4	patch
https://git.kernel.org/stable/c/61937f686290494998236c680ce0836b8dd63a3f	patch
https://git.kernel.org/stable/c/51b62286fc668c6eb74dee7624ec0beec3c5a0ed	patch
https://git.kernel.org/stable/c/9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.