CVE-2025-38134

Local service crash via USB hub teardown race

Published Jul 3, 2025 · Updated May 11, 2026

Null pointer dereference in the Linux kernel USB ACPI code allows local users to crash the system during a USB hub teardown race. usb_acpi_add_usb4_devlink() calls usb_hub_to_struct_hub() without checking for NULL, then dereferences hub->ports[udev->portnum - 1]. The path requires local low-privileged access and a concurrent hub driver unbind or teardown; the reported consequence is limited to system availability.

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

Null pointer dereference in the Linux kernel USB ACPI code allows local users to crash the system during a USB hub teardown race. usb_acpi_add_usb4_devlink() calls usb_hub_to_struct_hub() without checking for NULL, then dereferences hub->ports[udev->portnum - 1]. The path requires local low-privileged access and a concurrent hub driver unbind or teardown; the reported consequence is limited to system availability.

The record

CVE
CVE-2025-38134
Published
Jul 3, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 3, 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=6.12
  2. Affected versionversion=f1bfb4a6fed64de1771b43a76631942279851744 <73fb0ec9436ae87bcae067ce35d6cdd72bade86c
  3. Affected versionversion=f1bfb4a6fed64de1771b43a76631942279851744 <8fa544bff8466062e42949c93f3e528f4be5624b
  4. Affected versionversion=f1bfb4a6fed64de1771b43a76631942279851744 <e3d530173b70514d4390a94f9f979acad689b70a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.12; version=f1bfb4a6fed64de1771b43a76631942279851744 <73fb0ec9436ae87bcae067ce35d6cdd72bade86c; version=f1bfb4a6fed64de1771b43a76631942279851744 <8fa544bff8466062e42949c93f3e528f4be5624b; version=f1bfb4a6fed64de1771b43a76631942279851744 <e3d530173b70514d4390a94f9f979acad689b70a

Published CVSS scores

5.5Canonical UbuntuCVSS: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

T1499Endpoint Denial of Service

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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