CVE-2023-6039

System crash via detach-time timer race

Published Nov 9, 2023 · Updated Feb 27, 2025

Use-after-free in the Linux kernel LAN78XX USB Ethernet driver before 6.5-rc5 allows physically proximate attackers to crash the system. During lan78xx_disconnect, stat_monitor and delayed work can rearm each other after net_device is freed, causing its private data to be dereferenced. Exploitation requires detaching a LAN78XX USB device or unloading its driver, and the documented consequence is a system crash.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel LAN78XX USB Ethernet driver before 6.5-rc5 allows physically proximate attackers to crash the system. During lan78xx_disconnect, stat_monitor and delayed work can rearm each other after net_device is freed, causing its private data to be dereferenced. Exploitation requires detaching a LAN78XX USB device or unloading its driver, and the documented consequence is a system crash.

The record

CVE
CVE-2023-6039
Published
Nov 9, 2023
Updated
Feb 27, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1499
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5Red Hat, Inc.CVSS: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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
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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