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CVE Record

CVE-2025-71186: dmaengine: stm32: dmamux: fix device leak on route allocation

In the Linux kernel, the following vulnerability has been resolved: dmaengine: stm32: dmamux: fix device leak on route allocation Make sure to drop the reference taken when looking up the DMA mux platform device during route allocation. Note that holding a reference to a device does not prevent its driver data from going away so there is no point in keeping the reference.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2025-71186 is a Linux kernel fix for a resource leak in the STM32 DMA multiplexer driver. It appears most relevant to embedded or industrial Linux devices using STM32 hardware. Public sources do not provide CVSS, a clear impact statement, or evidence of active exploitation.

Executive priority

Treat as a targeted maintenance issue, not an emergency, unless critical embedded or Siemens-managed industrial systems use affected STM32 Linux kernels. Prioritize verification and normal kernel update cycles, with faster action for safety- or availability-sensitive devices.

Technical view

The Linux kernel patch fixes a device reference leak in dmaengine/stm32/dmamux route allocation. The code took a reference while looking up the DMA mux platform device and failed to drop it. The upstream notes say holding the reference does not protect driver data, so keeping it is unnecessary.

Likely exposure

Exposure is most likely on Linux-based embedded systems using the STM32 DMAMUX dmaengine driver. Standard enterprise servers are unlikely to be exposed unless they include this driver and relevant hardware. Siemens advisories reference this CVE, so affected Siemens product owners should review those notices directly.

Exploitation context

No provided source reports active exploitation, public exploit availability, or KEV listing. The available information describes a kernel resource-management bug, not a remotely exploitable path. Practical risk depends on whether affected hardware, driver configuration, and vulnerable kernel code are present.

Researcher notes

The record lacks CVSS, CWE, and detailed impact analysis. The affected-version data is ambiguous in the provided bundle. Researchers should inspect the linked stable commits and downstream vendor advisories before assigning operational severity or declaring product exposure.

Mitigation direction

  • Update to a vendor-supported kernel containing the referenced upstream stable fix.
  • Check Linux distribution advisories for packaged kernel availability.
  • For Siemens products, review SSA-253495 and SSA-019113 for product-specific guidance.
  • Prioritize embedded and industrial Linux assets using STM32 hardware.

Validation and detection

  • Inventory Linux kernels on embedded and industrial assets.
  • Confirm whether STM32 DMAMUX dmaengine support is built or loaded.
  • Compare kernel source or package changelogs against the referenced stable commits.
  • Check Siemens advisories for named products and fixed versions.
  • Document unaffected systems where STM32 DMAMUX hardware or driver is absent.
Prepared
Confidence
medium
Sources
11

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2025-71186 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
1ADP providers
10Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxdf7e762db5f6c8dbd9e480f1c9ef9851de346657, df7e762db5f6c8dbd9e480f1c9ef9851de346657, df7e762db5f6c8dbd9e480f1c9ef9851de346657, df7e762db5f6c8dbd9e480f1c9ef9851de346657, df7e762db5f6c8dbd9e480f1c9ef9851de346657, df7e762db5f6c8dbd9e480f1c9ef9851de346657, df7e762db5f6c8dbd9e480f1c9ef9851de346657unaffected
LinuxLinux4.15, 0, 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67, 6.18.7, 6.19affected
Weakness

CWE details

No CWE listed

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