CVE-2025-39832

Service interruption via devlink double-locking

Published Sep 16, 2025 · Updated Sep 16, 2025

Improper locking in the Linux mlx5 driver allows local users to interrupt service through a devlink firmware activation. The synchronous-reset unload worker reenters an mlx5 unload path while the physical function already holds the devlink lock, producing a double-lock condition and a lockdep assertion. Triggering the condition requires local access to invoke devlink reload with the fw_activate action on an mlx5 physical function, an operation that can reset firmware and cause downtime.

CVSS severity5.5
Medium
EPSS probability0.11%
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 the Linux mlx5 driver allows local users to interrupt service through a devlink firmware activation. The synchronous-reset unload worker reenters an mlx5 unload path while the physical function already holds the devlink lock, producing a double-lock condition and a lockdep assertion. Triggering the condition requires local access to invoke devlink reload with the fw_activate action on an mlx5 physical function, an operation that can reset firmware and cause downtime.

The record

CVE
CVE-2025-39832
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
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=6.5
  2. Affected versionversion=7a9770f1bfeaeddf5afabd3244e2c4c4966be37d <06d897148e79638651800d851a69547b56b4be2e
  3. Affected versionversion=7a9770f1bfeaeddf5afabd3244e2c4c4966be37d <0c87dba9ccd3801d3b503f0b4fd41be343af4f06
  4. Affected versionversion=7a9770f1bfeaeddf5afabd3244e2c4c4966be37d <902a8bc23a24882200f57cadc270e15a2cfaf2bb
  5. Affected versionversion=7a9770f1bfeaeddf5afabd3244e2c4c4966be37d <ddac9d0fe2493dd550cbfc75eeaf31e9b6dac959

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=7a9770f1bfeaeddf5afabd3244e2c4c4966be37d <06d897148e79638651800d851a69547b56b4be2e; version=7a9770f1bfeaeddf5afabd3244e2c4c4966be37d <0c87dba9ccd3801d3b503f0b4fd41be343af4f06; version=7a9770f1bfeaeddf5afabd3244e2c4c4966be37d <902a8bc23a24882200f57cadc270e15a2cfaf2bb; version=7a9770f1bfeaeddf5afabd3244e2c4c4966be37d <ddac9d0fe2493dd550cbfc75eeaf31e9b6dac959

Published CVSS scores

5.5NISTCVSS: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

CWE-667Improper Locking
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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