CVE-2025-37812

System hang via cdns3 interrupt-softirq spinlock deadlock

Published May 8, 2025 · Updated May 11, 2026

Deadlock in the cdns3 USB gadget driver in affected Linux releases allows local users to hang the system through heavy NCM traffic. The threaded interrupt handler can be preempted by a softirq while both paths hold the same spinlock, causing them to wait indefinitely. The condition requires PREEMPT_RT, an active NCM Ethernet gadget link, and sufficient local traffic generation; the demonstrated consequence is a hang.

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

What happened

Deadlock in the cdns3 USB gadget driver in affected Linux releases allows local users to hang the system through heavy NCM traffic. The threaded interrupt handler can be preempted by a softirq while both paths hold the same spinlock, causing them to wait indefinitely. The condition requires PREEMPT_RT, an active NCM Ethernet gadget link, and sufficient local traffic generation; the demonstrated consequence is a hang.

The record

CVE
CVE-2025-37812
Published
May 8, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.4
  2. Affected versionversion=7733f6c32e36ff9d7adadf40001039bf219b1cbe <09e90a9689a4aac7a2f726dc2aa472b0b37937b7
  3. Affected versionversion=7733f6c32e36ff9d7adadf40001039bf219b1cbe <48a62deb857f0694f611949015e70ad194d97159
  4. Affected versionversion=7733f6c32e36ff9d7adadf40001039bf219b1cbe <59a760e4796a3cd88d8b9d7706e0a638de677751
  5. Affected versionversion=7733f6c32e36ff9d7adadf40001039bf219b1cbe <74cd6e408a4c010e404832f0e4609d29bf1d0c41
  6. Affected versionversion=7733f6c32e36ff9d7adadf40001039bf219b1cbe <a1059896f2bfdcebcdc7153c3be2307ea319501f
  7. Affected versionversion=7733f6c32e36ff9d7adadf40001039bf219b1cbe <b96239582531775f2fdcb14de29bdb6870fd4c8c
  8. Affected versionversion=7733f6c32e36ff9d7adadf40001039bf219b1cbe <c27db84ed44e50ff90d9e3a2a25fae2e0a0fa015
  9. Affected versionversion=7733f6c32e36ff9d7adadf40001039bf219b1cbe <eebfb64c624fc738b669100173344fb441c5e719

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=7733f6c32e36ff9d7adadf40001039bf219b1cbe <09e90a9689a4aac7a2f726dc2aa472b0b37937b7; version=7733f6c32e36ff9d7adadf40001039bf219b1cbe <48a62deb857f0694f611949015e70ad194d97159; version=7733f6c32e36ff9d7adadf40001039bf219b1cbe <59a760e4796a3cd88d8b9d7706e0a638de677751; version=7733f6c32e36ff9d7adadf40001039bf219b1cbe <74cd6e408a4c010e404832f0e4609d29bf1d0c41; version=7733f6c32e36ff9d7adadf40001039bf219b1cbe <a1059896f2bfdcebcdc7153c3be2307ea319501f; version=7733f6c32e36ff9d7adadf40001039bf219b1cbe <b96239582531775f2fdcb14de29bdb6870fd4c8c; version=7733f6c32e36ff9d7adadf40001039bf219b1cbe <c27db84ed44e50ff90d9e3a2a25fae2e0a0fa015; version=7733f6c32e36ff9d7adadf40001039bf219b1cbe <eebfb64c624fc738b669100173344fb441c5e719

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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