CVE-2025-39805

Local service disruption via misordered device teardown

Published Sep 16, 2025 · Updated Sep 16, 2025

Improper device teardown in the Linux macb Ethernet driver allows local users to disrupt service by removing a macb device. macb_remove() calls phy_exit() while the network device remains registered, so later PHY detachment attempts to remove a missing kernfs link. Reachability requires local low-privilege access and a system using the macb driver; the observed result is a kernfs warning during teardown.

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

Improper device teardown in the Linux macb Ethernet driver allows local users to disrupt service by removing a macb device. macb_remove() calls phy_exit() while the network device remains registered, so later PHY detachment attempts to remove a missing kernfs link. Reachability requires local low-privilege access and a system using the macb driver; the observed result is a kernfs warning during teardown.

The record

CVE
CVE-2025-39805
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.18
  2. Affected versionversion=8b73fa3ae02b2401960de41b0454c0321377b203 <01b9128c5db1b470575d07b05b67ffa3cb02ebf1
  3. Affected versionversion=8b73fa3ae02b2401960de41b0454c0321377b203 <775fe690fd4a3337ad2115de2adb41b227d4dae7
  4. Affected versionversion=8b73fa3ae02b2401960de41b0454c0321377b203 <ff0d3bad32108b57265e5b48f15327549af771d3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=8b73fa3ae02b2401960de41b0454c0321377b203 <01b9128c5db1b470575d07b05b67ffa3cb02ebf1; version=8b73fa3ae02b2401960de41b0454c0321377b203 <775fe690fd4a3337ad2115de2adb41b227d4dae7; version=8b73fa3ae02b2401960de41b0454c0321377b203 <ff0d3bad32108b57265e5b48f15327549af771d3

Published CVSS scores

5.5NVDCVSS: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

T1499.004Application or System Exploitation

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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