CVE-2025-22127

System hang via compressed-cluster I/O error

Published Apr 16, 2025 · Updated Sep 7, 2026

Denial of service in Linux F2FS 5.6 through 6.14.1 allows local users to hang writeback through an I/O error on compressed data. The f2fs_prepare_compress_overwrite() path repeatedly reads compressed cluster pages after an I/O error while retaining the writepages lock. Triggering the failure requires local access to an F2FS volume with compression enabled; the resulting deadloop blocks other writeback tasks and can leave the system hung.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux F2FS 5.6 through 6.14.1 allows local users to hang writeback through an I/O error on compressed data. The f2fs_prepare_compress_overwrite() path repeatedly reads compressed cluster pages after an I/O error while retaining the writepages lock. Triggering the failure requires local access to an F2FS volume with compression enabled; the resulting deadloop blocks other writeback tasks and can leave the system hung.

The record

CVE
CVE-2025-22127
Published
Apr 16, 2025
Updated
Sep 7, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 7, 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=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <3147ee567dd9004a49826ddeaf0a4b12865d4409
  2. Affected versionversion=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <7215cf8ef54bdc9082dffac4662416d54961e258
  3. Affected versionversion=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <7cd460bd9e7c6e6c30a33982603f65fb5deab1e4
  4. Affected versionversion=5.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <3147ee567dd9004a49826ddeaf0a4b12865d4409; version=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <7215cf8ef54bdc9082dffac4662416d54961e258; version=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <7cd460bd9e7c6e6c30a33982603f65fb5deab1e4; version=5.6

Published CVSS scores

5.5NIST NVDCVSS: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 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-667Improper Locking
T1499Endpoint Denial of Service

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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