CVE-2025-38714

Kernel memory overread via unchecked B-tree bounds

Published Sep 4, 2025 · Updated Aug 5, 2026

Out-of-bounds reads in Linux and SIMATIC CN 4100 before V5.0 allow local users to access memory past an HFS+ B-tree node. hfsplus_bnode_read copies B-tree node content without validating that the requested offset and length remain inside the allocated node buffer. The documented attribute-deletion path demonstrates an eight-byte kernel-heap overread and KASAN fault; reliable code execution is not documented.

CVSS severity7.0
High
EPSS probability0.17%
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 reads in Linux and SIMATIC CN 4100 before V5.0 allow local users to access memory past an HFS+ B-tree node. hfsplus_bnode_read copies B-tree node content without validating that the requested offset and length remain inside the allocated node buffer. The documented attribute-deletion path demonstrates an eight-byte kernel-heap overread and KASAN fault; reliable code execution is not documented.

The record

CVE
CVE-2025-38714
Published
Sep 4, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-20, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <032f7ed6717a4cd3714f9801be39fdfc7f1c7644
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <291b7f2538920aa229500dbdd6c5f0927a51bc8b
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <475d770c19929082aab43337e6c077d0e2043df3
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ab59229bef6063edf3a6fc2e3e3fd7cd2181b29
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7fa4cef8ea13b37811287ef60674c5fd1dd02ee6
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8583d067ae22b7f32ce5277ca5543ac8bf86a3e5
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a2abd574d2fe22b8464cf6df5abb6f24d809eac0
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c80aa2aaaa5e69d5219c6af8ef7e754114bd08d2
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ffee8a7bed0fbfe29da239a922b59c5db897c613
  10. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <032f7ed6717a4cd3714f9801be39fdfc7f1c7644; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <291b7f2538920aa229500dbdd6c5f0927a51bc8b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <475d770c19929082aab43337e6c077d0e2043df3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ab59229bef6063edf3a6fc2e3e3fd7cd2181b29; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7fa4cef8ea13b37811287ef60674c5fd1dd02ee6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8583d067ae22b7f32ce5277ca5543ac8bf86a3e5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a2abd574d2fe22b8464cf6df5abb6f24d809eac0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c80aa2aaaa5e69d5219c6af8ef7e754114bd08d2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ffee8a7bed0fbfe29da239a922b59c5db897c613; version=2.6.12
Siemens · SIMATIC CN 4100version=0 <V5.0

Published CVSS scores

7.0Siemens ProductCERTCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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-20Improper Input Validation
T1499Endpoint Denial of Service

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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