CVE-2024-40904

CPU lockup via unratelimited cdc-wdm logging

Published Jul 12, 2024 · Updated May 11, 2026

Denial of service in the Linux cdc-wdm USB driver allows local users to lock a CPU via repeated interrupt-URB protocol errors. The wdm_int_callback handler immediately resubmits -EPROTO interrupt URBs and logs each failure with unrestricted dev_err calls, saturating kernel logging. Triggering requires local access to dummy-hcd USB emulation or an equivalent error-producing CDC-WDM path, and the observed consequence is a soft CPU lockup.

CVSS severity5.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux cdc-wdm USB driver allows local users to lock a CPU via repeated interrupt-URB protocol errors. The wdm_int_callback handler immediately resubmits -EPROTO interrupt URBs and logs each failure with unrestricted dev_err calls, saturating kernel logging. Triggering requires local access to dummy-hcd USB emulation or an equivalent error-producing CDC-WDM path, and the observed consequence is a soft CPU lockup.

The record

CVE
CVE-2024-40904
Published
Jul 12, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 2024CVE 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=2.6.28
  2. Affected versionversion=9908a32e94de2141463e104c9924279ed3509447 <02a4c0499fc3a02e992b4c69a9809912af372d94
  3. Affected versionversion=9908a32e94de2141463e104c9924279ed3509447 <05b2cd6d33f700597e6f081b53c668a226a96d28
  4. Affected versionversion=9908a32e94de2141463e104c9924279ed3509447 <217d1f44fff560b3995a685a60aa66e55a7f0f56
  5. Affected versionversion=9908a32e94de2141463e104c9924279ed3509447 <22f00812862564b314784167a89f27b444f82a46
  6. Affected versionversion=9908a32e94de2141463e104c9924279ed3509447 <53250b54c92fe087fd4b0c48f85529efe1ebd879
  7. Affected versionversion=9908a32e94de2141463e104c9924279ed3509447 <72a3fe36cf9f0d030865e571f45a40f9c1e07e8a
  8. Affected versionversion=9908a32e94de2141463e104c9924279ed3509447 <82075aff7ffccb1e72b0ac8aa349e473624d857c
  9. Affected versionversion=9908a32e94de2141463e104c9924279ed3509447 <c0747d76eb05542b5d49f67069b64ef5ff732c6c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.28; version=9908a32e94de2141463e104c9924279ed3509447 <02a4c0499fc3a02e992b4c69a9809912af372d94; version=9908a32e94de2141463e104c9924279ed3509447 <05b2cd6d33f700597e6f081b53c668a226a96d28; version=9908a32e94de2141463e104c9924279ed3509447 <217d1f44fff560b3995a685a60aa66e55a7f0f56; version=9908a32e94de2141463e104c9924279ed3509447 <22f00812862564b314784167a89f27b444f82a46; version=9908a32e94de2141463e104c9924279ed3509447 <53250b54c92fe087fd4b0c48f85529efe1ebd879; version=9908a32e94de2141463e104c9924279ed3509447 <72a3fe36cf9f0d030865e571f45a40f9c1e07e8a; version=9908a32e94de2141463e104c9924279ed3509447 <82075aff7ffccb1e72b0ac8aa349e473624d857c; version=9908a32e94de2141463e104c9924279ed3509447 <c0747d76eb05542b5d49f67069b64ef5ff732c6c

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

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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