CVE-2025-40068

Disk data access or destruction via runlist overflow

Published Oct 28, 2025 · Updated Oct 28, 2025

Integer overflow in the NTFS3 runlist decoder in affected Linux kernels beginning with 5.15 allows attackers to read or destroy disk data. run_unpack() adds unvalidated runlist lengths and cluster offsets, allowing wrapped VCN or LCN values to bypass volume-boundary checks. A crafted NTFS volume must be mounted locally; the resulting mappings can read, overwrite, deallocate, or discard unrelated disk clusters.

CVSS severity8.4
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

Integer overflow in the NTFS3 runlist decoder in affected Linux kernels beginning with 5.15 allows attackers to read or destroy disk data. run_unpack() adds unvalidated runlist lengths and cluster offsets, allowing wrapped VCN or LCN values to bypass volume-boundary checks. A crafted NTFS volume must be mounted locally; the resulting mappings can read, overwrite, deallocate, or discard unrelated disk clusters.

The record

CVE
CVE-2025-40068
Published
Oct 28, 2025
Updated
Oct 28, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 2025Record 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=4342306f0f0d5ff4315a204d315c1b51b914fca5 <3ac37e100385b59ac821a62118494442238aaac4
  2. Affected versionversion=4342306f0f0d5ff4315a204d315c1b51b914fca5 <5aa5799d162ad1b8e8b699d48b6218143c695a78
  3. Affected versionversion=4342306f0f0d5ff4315a204d315c1b51b914fca5 <736fc7bf5f68f6b74a0925b7e072c571838657d2
  4. Affected versionversion=4342306f0f0d5ff4315a204d315c1b51b914fca5 <9378cfe228c2c679564a4116bcb28c8e89dff989
  5. Affected versionversion=4342306f0f0d5ff4315a204d315c1b51b914fca5 <a86c8b9d03f7101e1750233846fe989df6f0d631
  6. Affected versionversion=4342306f0f0d5ff4315a204d315c1b51b914fca5 <f6b36cfd25cbadad63447c673743cf771090e756
  7. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4342306f0f0d5ff4315a204d315c1b51b914fca5 <3ac37e100385b59ac821a62118494442238aaac4; version=4342306f0f0d5ff4315a204d315c1b51b914fca5 <5aa5799d162ad1b8e8b699d48b6218143c695a78; version=4342306f0f0d5ff4315a204d315c1b51b914fca5 <736fc7bf5f68f6b74a0925b7e072c571838657d2; version=4342306f0f0d5ff4315a204d315c1b51b914fca5 <9378cfe228c2c679564a4116bcb28c8e89dff989; version=4342306f0f0d5ff4315a204d315c1b51b914fca5 <a86c8b9d03f7101e1750233846fe989df6f0d631; version=4342306f0f0d5ff4315a204d315c1b51b914fca5 <f6b36cfd25cbadad63447c673743cf771090e756; version=5.15

Published CVSS scores

8.4UbuntuCVSS:3.1/AV:L/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1204.002Malicious File

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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