CVE-2026-31756

Local denial of service via lock mismatch

Published May 1, 2026 · Updated May 1, 2026

Improper locking in the Linux Kernel USB DWC2 gadget code allows local users to deadlock the kernel during gadget shutdown. The dwc2_hsotg_udc_stop() path calls dwc2_gadget_exit_clock_gating() without holding hsotg->lock, so call_gadget() unlocks an unheld spinlock and leaves it locked on return. Reachability requires local low-privileged access and a system using the DWC2 USB gadget driver; the resulting deadlock interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux Kernel USB DWC2 gadget code allows local users to deadlock the kernel during gadget shutdown. The dwc2_hsotg_udc_stop() path calls dwc2_gadget_exit_clock_gating() without holding hsotg->lock, so call_gadget() unlocks an unheld spinlock and leaves it locked on return. Reachability requires local low-privileged access and a system using the DWC2 USB gadget driver; the resulting deadlock interrupts the host.

The record

CVE
CVE-2026-31756
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1ac826cebc2776f91569f2aa9c9c3da2375d2096 <8ffe31acb3b77a30ae34d01719a269881569fb7f
  2. Affected versionversion=41732f9febdccb4f9b87c13cb915d717d68ccafd <beab10429439e20708036a66fb0d97ffb79da6a1
  3. Affected versionversion=5cb3cb3db317c58d50b68f3ca3bb8343ea9d1acd <e9fcca3e87463013d595c65c2189ffaa32ad3b50
  4. Affected versionversion=6.16
  5. Affected versionversion=af076a41f8a28faf9ceb9dd2d88aef2c202ef39a <51b62286fc668c6eb74dee7624ec0beec3c5a0ed
  6. Affected versionversion=af076a41f8a28faf9ceb9dd2d88aef2c202ef39a <61937f686290494998236c680ce0836b8dd63a3f
  7. Affected versionversion=af076a41f8a28faf9ceb9dd2d88aef2c202ef39a <9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a
  8. Affected versionversion=b39c203690fa1678daecc60f347e43c8b593b969
  9. Affected versionversion=ba78c2b3254c4a458c01776612e8a573e12f8d26 <4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1ac826cebc2776f91569f2aa9c9c3da2375d2096 <8ffe31acb3b77a30ae34d01719a269881569fb7f; version=41732f9febdccb4f9b87c13cb915d717d68ccafd <beab10429439e20708036a66fb0d97ffb79da6a1; version=5cb3cb3db317c58d50b68f3ca3bb8343ea9d1acd <e9fcca3e87463013d595c65c2189ffaa32ad3b50; version=6.16; version=af076a41f8a28faf9ceb9dd2d88aef2c202ef39a <51b62286fc668c6eb74dee7624ec0beec3c5a0ed; version=af076a41f8a28faf9ceb9dd2d88aef2c202ef39a <61937f686290494998236c680ce0836b8dd63a3f; version=af076a41f8a28faf9ceb9dd2d88aef2c202ef39a <9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557a; version=b39c203690fa1678daecc60f347e43c8b593b969; version=ba78c2b3254c4a458c01776612e8a573e12f8d26 <4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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