CVE-2024-26933

USB hub operation hang via sysfs lock inversion

Published May 1, 2024 · Updated May 11, 2026

Improper locking in Linux 6.0 and later affected branches allows local users to deadlock USB hub removal or reconfiguration through sysfs. The disable_show() and disable_store() callbacks in drivers/usb/core/port.c remain active while waiting for the parent hub device lock, while hub removal holds that lock and waits in device_del() for the callbacks to finish. Triggering the hang requires local low-privileged sysfs access concurrent with another process removing the hub or changing its configuration.

CVSS severity7.8
High
EPSS probability0.18%
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 Linux 6.0 and later affected branches allows local users to deadlock USB hub removal or reconfiguration through sysfs. The disable_show() and disable_store() callbacks in drivers/usb/core/port.c remain active while waiting for the parent hub device lock, while hub removal holds that lock and waits in device_del() for the callbacks to finish. Triggering the hang requires local low-privileged sysfs access concurrent with another process removing the hub or changing its configuration.

The record

CVE
CVE-2024-26933
Published
May 1, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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=6.0
  2. Affected versionversion=f061f43d7418cb62b8d073e221ec75d3f5b89e17 <4facc9421117ba9d8148c73771b213887fec77f7
  3. Affected versionversion=f061f43d7418cb62b8d073e221ec75d3f5b89e17 <73d1589b91f2099e5f6534a8497b7c6b527e064e
  4. Affected versionversion=f061f43d7418cb62b8d073e221ec75d3f5b89e17 <9dac54f08198147f5ec0ec52fcf1bc8ac899ac05
  5. Affected versionversion=f061f43d7418cb62b8d073e221ec75d3f5b89e17 <f4d1960764d8a70318b02f15203a1be2b2554ca1
  6. Affected versionversion=f061f43d7418cb62b8d073e221ec75d3f5b89e17 <f51849833705dea5b4f9b0c8de714dd87bd6c95c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=f061f43d7418cb62b8d073e221ec75d3f5b89e17 <4facc9421117ba9d8148c73771b213887fec77f7; version=f061f43d7418cb62b8d073e221ec75d3f5b89e17 <73d1589b91f2099e5f6534a8497b7c6b527e064e; version=f061f43d7418cb62b8d073e221ec75d3f5b89e17 <9dac54f08198147f5ec0ec52fcf1bc8ac899ac05; version=f061f43d7418cb62b8d073e221ec75d3f5b89e17 <f4d1960764d8a70318b02f15203a1be2b2554ca1; version=f061f43d7418cb62b8d073e221ec75d3f5b89e17 <f51849833705dea5b4f9b0c8de714dd87bd6c95c

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
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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