CVE-2025-37985

WWAN control-channel interruption via poisoned URB race

Published May 20, 2025 · Updated May 11, 2026

Race condition in the Linux USB CDC-WDM driver allows local users to interrupt WWAN control-channel operation via concurrent access. wdm_wwan_port_stop clears WDM_WWAN_IN_USE before URBs are restored, allowing wdm_open to open the character device while its URBs remain poisoned. Exploitation requires low-privileged local access, a USB WWAN device, and precisely timed overlap; the reported consequence is limited to availability.

CVSS severity4.7
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux USB CDC-WDM driver allows local users to interrupt WWAN control-channel operation via concurrent access. wdm_wwan_port_stop clears WDM_WWAN_IN_USE before URBs are restored, allowing wdm_open to open the character device while its URBs remain poisoned. Exploitation requires low-privileged local access, a USB WWAN device, and precisely timed overlap; the reported consequence is limited to availability.

The record

CVE
CVE-2025-37985
Published
May 20, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 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=5.14
  2. Affected versionversion=cac6fb015f719104e60b1c68c15ca5b734f57b9c <217fe1fc7d112595a793e02b306710e702eac492
  3. Affected versionversion=cac6fb015f719104e60b1c68c15ca5b734f57b9c <52ae15c665b5fe5876655aaccc3ef70560b0e314
  4. Affected versionversion=cac6fb015f719104e60b1c68c15ca5b734f57b9c <54f7f8978af19f899dec80bcc71c8d4855dfbd72
  5. Affected versionversion=cac6fb015f719104e60b1c68c15ca5b734f57b9c <b02a3fef3e8c8fe5a0a266f7a14f38cc608fb167
  6. Affected versionversion=cac6fb015f719104e60b1c68c15ca5b734f57b9c <c1846ed4eb527bdfe6b3b7dd2c78e2af4bf98f4f
  7. Affected versionversion=cac6fb015f719104e60b1c68c15ca5b734f57b9c <e3c9adc69357fcbe6253a2bc2588ee4bbaaedbe9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=cac6fb015f719104e60b1c68c15ca5b734f57b9c <217fe1fc7d112595a793e02b306710e702eac492; version=cac6fb015f719104e60b1c68c15ca5b734f57b9c <52ae15c665b5fe5876655aaccc3ef70560b0e314; version=cac6fb015f719104e60b1c68c15ca5b734f57b9c <54f7f8978af19f899dec80bcc71c8d4855dfbd72; version=cac6fb015f719104e60b1c68c15ca5b734f57b9c <b02a3fef3e8c8fe5a0a266f7a14f38cc608fb167; version=cac6fb015f719104e60b1c68c15ca5b734f57b9c <c1846ed4eb527bdfe6b3b7dd2c78e2af4bf98f4f; version=cac6fb015f719104e60b1c68c15ca5b734f57b9c <e3c9adc69357fcbe6253a2bc2588ee4bbaaedbe9

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Endpoint Denial of Service: Application 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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