CVE-2025-71186

Local denial of service via device-reference leak

Published Jan 31, 2026 · Updated Jan 31, 2026

Resource leak in affected Linux kernel releases allows local users to interrupt service through repeated STM32 DMAMUX route allocation. The stm32_dmamux_route_allocate function looks up the DMA-mux platform device but fails to call put_device(), retaining a reference after route allocation. Reachability requires a Linux system using the STM32 DMAMUX driver and local low-privileged access; repeated allocation consumes device references and affects availability only.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in affected Linux kernel releases allows local users to interrupt service through repeated STM32 DMAMUX route allocation. The stm32_dmamux_route_allocate function looks up the DMA-mux platform device but fails to call put_device(), retaining a reference after route allocation. Reachability requires a Linux system using the STM32 DMAMUX driver and local low-privileged access; repeated allocation consumes device references and affects availability only.

The record

CVE
CVE-2025-71186
Published
Jan 31, 2026
Updated
Jan 31, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 31, 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=4.15
  2. Affected versionversion=df7e762db5f6c8dbd9e480f1c9ef9851de346657 <1a179ac01ff3993ab97e33cc77c316ed7415cda1
  3. Affected versionversion=df7e762db5f6c8dbd9e480f1c9ef9851de346657 <2fb10259d4efb4367787b5ae9c94192e8a91c648
  4. Affected versionversion=df7e762db5f6c8dbd9e480f1c9ef9851de346657 <3ef52d31cce8ba816739085a61efe07b63c6cf27
  5. Affected versionversion=df7e762db5f6c8dbd9e480f1c9ef9851de346657 <dd6e4943889fb354efa3f700e42739da9bddb6ef

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.15; version=df7e762db5f6c8dbd9e480f1c9ef9851de346657 <1a179ac01ff3993ab97e33cc77c316ed7415cda1; version=df7e762db5f6c8dbd9e480f1c9ef9851de346657 <2fb10259d4efb4367787b5ae9c94192e8a91c648; version=df7e762db5f6c8dbd9e480f1c9ef9851de346657 <3ef52d31cce8ba816739085a61efe07b63c6cf27; version=df7e762db5f6c8dbd9e480f1c9ef9851de346657 <dd6e4943889fb354efa3f700e42739da9bddb6ef

Published CVSS scores

5.5NIST NVDCVSS: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

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

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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