CVE-2025-39790

Host memory corruption via stale MHI event pointer

Published Sep 11, 2025 · Updated Aug 5, 2026

Double free in the MHI host driver in affected Linux kernels and SIMATIC CN 4100 before V5.0 allows local users to corrupt memory. The completion-event path treats a single-element event whose TRE pointer skips ahead as a chained transaction, and xfer_cb() then frees an already released buffer. Exploitation requires control of an MHI endpoint and precise access during its event-ring update window; the resulting memory corruption can crash the host.

CVSS severity6.7
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

Double free in the MHI host driver in affected Linux kernels and SIMATIC CN 4100 before V5.0 allows local users to corrupt memory. The completion-event path treats a single-element event whose TRE pointer skips ahead as a chained transaction, and xfer_cb() then frees an already released buffer. Exploitation requires control of an MHI endpoint and precise access during its event-ring update window; the resulting memory corruption can crash the host.

The record

CVE
CVE-2025-39790
Published
Sep 11, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=1d3173a3bae7039b765a0956e3e4bf846dbaacb8 <2ec99b922f4661521927eeada76f431eebfbabc4
  2. Affected versionversion=1d3173a3bae7039b765a0956e3e4bf846dbaacb8 <4079c6c59705b96285219b9efc63cab870d757b7
  3. Affected versionversion=1d3173a3bae7039b765a0956e3e4bf846dbaacb8 <44e1a079e18f78d6594a715b0c6d7e18c656f7b9
  4. Affected versionversion=1d3173a3bae7039b765a0956e3e4bf846dbaacb8 <5bd398e20f0833ae8a1267d4f343591a2dd20185
  5. Affected versionversion=1d3173a3bae7039b765a0956e3e4bf846dbaacb8 <5e17429679a8545afe438ce7a82a13a54e8ceabb
  6. Affected versionversion=1d3173a3bae7039b765a0956e3e4bf846dbaacb8 <7b3f0e3b60c27f4fcb69927d84987e5fd6240530
  7. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1d3173a3bae7039b765a0956e3e4bf846dbaacb8 <2ec99b922f4661521927eeada76f431eebfbabc4; version=1d3173a3bae7039b765a0956e3e4bf846dbaacb8 <4079c6c59705b96285219b9efc63cab870d757b7; version=1d3173a3bae7039b765a0956e3e4bf846dbaacb8 <44e1a079e18f78d6594a715b0c6d7e18c656f7b9; version=1d3173a3bae7039b765a0956e3e4bf846dbaacb8 <5bd398e20f0833ae8a1267d4f343591a2dd20185; version=1d3173a3bae7039b765a0956e3e4bf846dbaacb8 <5e17429679a8545afe438ce7a82a13a54e8ceabb; version=1d3173a3bae7039b765a0956e3e4bf846dbaacb8 <7b3f0e3b60c27f4fcb69927d84987e5fd6240530; version=5.7
Siemens · SIMATIC CN 4100version=0 <V5.0

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.7Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
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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