CVE-2025-40347Network attack vector

Remote service interruption via recursive MDIO locking

Published Dec 16, 2025 · Updated Dec 16, 2025

Deadlock in the ENETC driver in Linux allows remote attackers to interrupt network service via crafted traffic. The enetc_poll path holds enetc_mdio_lock for reading, then reenters enetc_lock_mdio while a higher-priority writer is waiting, blocking both readers and the writer. Exposure requires the LS1028A ENETC interface, a real-time kernel, and the err050089 workaround; triggering the race hangs kernel threads and permanently stops network processing on the interface.

CVSS severity7.5
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in the ENETC driver in Linux allows remote attackers to interrupt network service via crafted traffic. The enetc_poll path holds enetc_mdio_lock for reading, then reenters enetc_lock_mdio while a higher-priority writer is waiting, blocking both readers and the writer. Exposure requires the LS1028A ENETC interface, a real-time kernel, and the err050089 workaround; triggering the race hangs kernel threads and permanently stops network processing on the interface.

The record

CVE
CVE-2025-40347
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 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=5.12
  2. Affected versionversion=6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 <1f92f5bd057a4fad9dab6af17963cdd21e5da6ed
  3. Affected versionversion=6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 <2781ca82ce8cad263d80b617addb727e6a84c9e5
  4. Affected versionversion=6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 <2e55a49dc3b2a6b23329e4fbbd8a5feb20e220aa
  5. Affected versionversion=6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 <50bd33f6b3922a6b760aa30d409cae891cec8fb5
  6. Affected versionversion=bf9c564716a13dde6a990d3b02c27cd6e39608bf
  7. Affected versionversion=ff966263f5f9fdf9740f03fed0762ce73c230a6a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.12; version=6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 <1f92f5bd057a4fad9dab6af17963cdd21e5da6ed; version=6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 <2781ca82ce8cad263d80b617addb727e6a84c9e5; version=6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 <2e55a49dc3b2a6b23329e4fbbd8a5feb20e220aa; version=6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 <50bd33f6b3922a6b760aa30d409cae891cec8fb5; version=bf9c564716a13dde6a990d3b02c27cd6e39608bf; version=ff966263f5f9fdf9740f03fed0762ce73c230a6a

Published CVSS scores

7.5LinuxCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
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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