CVE-2025-38715

Kernel crash via unchecked HFS bnode offsets

Published Sep 4, 2025 · Updated Aug 5, 2026

Out-of-bounds access in Linux HFS bnode operations allows local users to disclose or corrupt kernel memory and crash the system. The hfs_bnode_read(), hfs_bnode_write(), hfs_bnode_clear(), hfs_bnode_copy(), and hfs_bnode_move() paths accept record offsets and lengths without ensuring that accesses remain inside the allocated bnode. Exploitation requires local low-privileged filesystem operations on an attacker-controlled HFS volume; consequences include kernel-memory disclosure, heap corruption, and a kernel panic.

CVSS severity7.8
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 access in Linux HFS bnode operations allows local users to disclose or corrupt kernel memory and crash the system. The hfs_bnode_read(), hfs_bnode_write(), hfs_bnode_clear(), hfs_bnode_copy(), and hfs_bnode_move() paths accept record offsets and lengths without ensuring that accesses remain inside the allocated bnode. Exploitation requires local low-privileged filesystem operations on an attacker-controlled HFS volume; consequences include kernel-memory disclosure, heap corruption, and a kernel panic.

The record

CVE
CVE-2025-38715
Published
Sep 4, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-20, T1499.004
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

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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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <384a66b89f9540a9a8cb0f48807697dfabaece4c
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <67ecc81f6492275c9c54280532f558483c99c90e
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a1a60e79502279f996e55052f50cc14919020475
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a431930c9bac518bf99d6b1da526a7f37ddee8d8
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7d2dc2421e821e4045775e6dc226378328de6f6
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eec522fd0d28106b14a59ab2d658605febe4a3bb
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <efc095b35b23297e419c2ab4fc1ed1a8f0781a29
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc7f732984ec91f30be3e574e0644066d07f2b78
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fe2891a9c43ab87d1a210d61e6438ca6936e2f62
  10. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <384a66b89f9540a9a8cb0f48807697dfabaece4c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <67ecc81f6492275c9c54280532f558483c99c90e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a1a60e79502279f996e55052f50cc14919020475; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a431930c9bac518bf99d6b1da526a7f37ddee8d8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7d2dc2421e821e4045775e6dc226378328de6f6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eec522fd0d28106b14a59ab2d658605febe4a3bb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <efc095b35b23297e419c2ab4fc1ed1a8f0781a29; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc7f732984ec91f30be3e574e0644066d07f2b78; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fe2891a9c43ab87d1a210d61e6438ca6936e2f62; version=2.6.12
Siemens · SIMATIC CN 4100version=0 <V5.0

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/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
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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