CVE-2025-40025Public exploit

Kernel panic via misclassified F2FS dnode footer

Published Oct 28, 2025 · Updated Oct 28, 2025

Improper F2FS node validation in Linux 3.8 through 6.17.1 allows local users to crash the kernel via a crafted filesystem image. f2fs_get_node_folio() accepts a non-inode dnode whose footer inode and node IDs match, so ADDRS_PER_PAGE() computes the wrong block-address count. After the image is mounted, an unprivileged punch-hole request drives the count to zero, triggering a kernel panic or configuration-dependent memory and filesystem corruption.

CVSS severity9.8
Critical
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper F2FS node validation in Linux 3.8 through 6.17.1 allows local users to crash the kernel via a crafted filesystem image. f2fs_get_node_folio() accepts a non-inode dnode whose footer inode and node IDs match, so ADDRS_PER_PAGE() computes the wrong block-address count. After the image is mounted, an unprivileged punch-hole request drives the count to zero, triggering a kernel panic or configuration-dependent memory and filesystem corruption.

The record

CVE
CVE-2025-40025
Published
Oct 28, 2025
Updated
Oct 28, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <186098f34b8a5d65eb828f952c8cc56272c60ea0
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c18ecd99e0c707ef8f83cace861cbc3162f4fdf1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <186098f34b8a5d65eb828f952c8cc56272c60ea0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c18ecd99e0c707ef8f83cace861cbc3162f4fdf1

Published CVSS scores

9.8Linux kernel CVE teamCVSS: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 exploitPublished

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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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