CVE-2025-38167

Local system crash via unchecked NTFS index entry

Published Jul 3, 2025 · Updated Jul 14, 2026

A NULL pointer dereference in the Linux kernel NTFS3 driver allows local users to crash affected Linux and Siemens systems via malformed NTFS indexes. In indx_get_entry_to_replace(), fs/ntfs3/index.c fails to reject NULL entries returned by hdr_first_de() before later dereference or copy sizing. Exploitation requires low-privileged local access and NTFS3 processing of a malformed index; the documented consequence is loss of availability.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in the Linux kernel NTFS3 driver allows local users to crash affected Linux and Siemens systems via malformed NTFS indexes. In indx_get_entry_to_replace(), fs/ntfs3/index.c fails to reject NULL entries returned by hdr_first_de() before later dereference or copy sizing. Exploitation requires low-privileged local access and NTFS3 processing of a malformed index; the documented consequence is loss of availability.

The record

CVE
CVE-2025-38167
Published
Jul 3, 2025
Updated
Jul 14, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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=V3.1.5 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*
The Linux Kernel Organization · Linuxversion=5.15; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <2d5879f64554181b89f44d4817b9ea86e8e913e1; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <4ecd0cde89feee26525ccdf1af0c1ae156ca010b; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <5390b3d4c6d41d05bb9149d094d504cbc9ea85bf; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <701340a25b1ad210e6b8192195be21fd3fcc22c7; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <83cd0aa74793384dbdffc140500b200e9776a302; version=82cae269cfa953032fbb8980a7d554d60fb00b17 <af5cab0e5b6f8edb0be51a9f47f3f620e0b4fd70
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.5 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS: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-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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