CVE-2025-37785

Kernel crash via malformed ext4 dot entry

Published Apr 18, 2025 · Updated Sep 8, 2026

Out-of-bounds read in Linux ext4 and Siemens MFP firmware allows local users to crash the kernel via a corrupted filesystem. ext4_empty_dir uses a full-block rec_len for the dot entry to place the dot-dot pointer exactly past the data block, then ext4_check_dir_entry dereferences it. Reaching the fault requires local access to mount the crafted filesystem and later remove the corrupted directory; the published Siemens impact is limited to service interruption.

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

What happened

Out-of-bounds read in Linux ext4 and Siemens MFP firmware allows local users to crash the kernel via a corrupted filesystem. ext4_empty_dir uses a full-block rec_len for the dot entry to place the dot-dot pointer exactly past the data block, then ext4_check_dir_entry dereferences it. Reaching the fault requires local access to mount the crafted filesystem and later remove the corrupted directory; the published Siemens impact is limited to service interruption.

The record

CVE
CVE-2025-37785
Published
Apr 18, 2025
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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=V3.1.6 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*
The Linux Kernel Organization · Linuxversion=2.6.19; version=ac27a0ec112a089f1a5102bc8dffc79c8c815571 <14da7dbecb430e35b5889da8dae7bef33173b351; version=ac27a0ec112a089f1a5102bc8dffc79c8c815571 <52a5509ab19a5d3afe301165d9b5787bba34d842; version=ac27a0ec112a089f1a5102bc8dffc79c8c815571 <53bc45da8d8da92ec07877f5922b130562eb4b00; version=ac27a0ec112a089f1a5102bc8dffc79c8c815571 <89503e5eae64637d0fa2218912b54660effe7d93; version=ac27a0ec112a089f1a5102bc8dffc79c8c815571 <ac28c5684c1cdab650a7e5065b19e91577d37a4b; version=ac27a0ec112a089f1a5102bc8dffc79c8c815571 <b47584c556444cf7acb66b26a62cbc348eb92b78; version=ac27a0ec112a089f1a5102bc8dffc79c8c815571 <b7531a4f99c3887439d778afaf418d1a01a5f01b; version=ac27a0ec112a089f1a5102bc8dffc79c8c815571 <d5e206778e96e8667d3bde695ad372c296dc9353; version=ac27a0ec112a089f1a5102bc8dffc79c8c815571 <e47f472a664d70a3d104a6c2a035cdff55a719b4
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.6 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
5.5Siemens ProductCERTCVSS: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-125Out-of-bounds Read

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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