CVE-2025-71069

Kernel warning via stale F2FS dentry cache

Published Jan 13, 2026 · Updated Jan 13, 2026

Filesystem state inconsistency in affected Linux Kernel releases allows local users to trigger a kernel warning through crafted F2FS renames. In f2fs_rename, a failed f2fs_add_link call leaves committed directory changes paired with stale VFS dentries that reference an inode whose link count is already zero. The prerequisite is administrative control to mount a corrupted F2FS image and issue the required rename sequence; published evidence reports a drop_nlink warning, not a crash or broader service interruption.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Filesystem state inconsistency in affected Linux Kernel releases allows local users to trigger a kernel warning through crafted F2FS renames. In f2fs_rename, a failed f2fs_add_link call leaves committed directory changes paired with stale VFS dentries that reference an inode whose link count is already zero. The prerequisite is administrative control to mount a corrupted F2FS image and issue the required rename sequence; published evidence reports a drop_nlink warning, not a crash or broader service interruption.

The record

CVE
CVE-2025-71069
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 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=4.2
  2. Affected versionversion=7e01e7ad746bc8198a8b46163ddc73a1c7d22339 <0dde30753c1e8648665dbe069d814e540ce2fd37
  3. Affected versionversion=7e01e7ad746bc8198a8b46163ddc73a1c7d22339 <3d65e27e57aaa9d66709fda4cbfb62a87c04a3f5
  4. Affected versionversion=7e01e7ad746bc8198a8b46163ddc73a1c7d22339 <64587ab4d1f16fc94f70e04fa87b2e3f69f8a7bb
  5. Affected versionversion=7e01e7ad746bc8198a8b46163ddc73a1c7d22339 <c89845fae250efdd59c1d4ec60e9e1c652cee4b6
  6. Affected versionversion=7e01e7ad746bc8198a8b46163ddc73a1c7d22339 <d33f89b34aa313f50f9a512d58dd288999f246b0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.2; version=7e01e7ad746bc8198a8b46163ddc73a1c7d22339 <0dde30753c1e8648665dbe069d814e540ce2fd37; version=7e01e7ad746bc8198a8b46163ddc73a1c7d22339 <3d65e27e57aaa9d66709fda4cbfb62a87c04a3f5; version=7e01e7ad746bc8198a8b46163ddc73a1c7d22339 <64587ab4d1f16fc94f70e04fa87b2e3f69f8a7bb; version=7e01e7ad746bc8198a8b46163ddc73a1c7d22339 <c89845fae250efdd59c1d4ec60e9e1c652cee4b6; version=7e01e7ad746bc8198a8b46163ddc73a1c7d22339 <d33f89b34aa313f50f9a512d58dd288999f246b0

Published CVSS scores

No CVSS assessment is available in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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