CVE-2025-38677

Kernel crash via malformed F2FS dnode image

Published Aug 30, 2025 · Updated Aug 5, 2026

Out-of-bounds access in the F2FS driver in Linux allows local users to crash the kernel by triggering a write on a corrupted filesystem image. The f2fs_get_dnode_of_data function parses a dnode whose node identifier matches its inode as an inode node, then computes a block-address offset beyond the page boundary. Exploitation requires local access and kernel processing of crafted F2FS metadata during a write; the established consequence is a kernel crash without integrity impact.

CVSS severity5.5
Medium
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 the F2FS driver in Linux allows local users to crash the kernel by triggering a write on a corrupted filesystem image. The f2fs_get_dnode_of_data function parses a dnode whose node identifier matches its inode as an inode node, then computes a block-address offset beyond the page boundary. Exploitation requires local access and kernel processing of crafted F2FS metadata during a write; the established consequence is a kernel crash without integrity impact.

The record

CVE
CVE-2025-38677
Published
Aug 30, 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. Aug 30, 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=3.8
  2. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <6b7784ea07e6aa044f74b39d6b5af5e28746fc81
  3. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <77de19b6867f2740cdcb6c9c7e50d522b47847a4
  4. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <888aa660144bcb6ec07839da756ee46bfcf7fc53
  5. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <901f62efd6e855f93d8b1175540f29f4dc45ba55
  6. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <92ef491b506a0f4dd971a3a76f86f2d8f5370180
  7. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <a650654365c57407413e9b1f6ff4d539bf2e99ca
  8. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <ee4d13f5407cbdf1216cc258f45492075713889a
  9. Affected versionversion=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <f1d5093d9fe9f3c74c123741c88666cc853b79c5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.8; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <6b7784ea07e6aa044f74b39d6b5af5e28746fc81; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <77de19b6867f2740cdcb6c9c7e50d522b47847a4; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <888aa660144bcb6ec07839da756ee46bfcf7fc53; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <901f62efd6e855f93d8b1175540f29f4dc45ba55; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <92ef491b506a0f4dd971a3a76f86f2d8f5370180; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <a650654365c57407413e9b1f6ff4d539bf2e99ca; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <ee4d13f5407cbdf1216cc258f45492075713889a; version=98e4da8ca301e062d79ae168c67e56f3c3de3ce4 <f1d5093d9fe9f3c74c123741c88666cc853b79c5
Siemens · SIMATIC CN 4100version=0 <V5.0

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Siemens ProductCERTCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499.004Endpoint Denial of Service: Application 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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