CVE-2026-23267

Filesystem mount denial via atomic checkpoint race

Published Mar 18, 2026 · Updated Mar 18, 2026

Race condition in Linux Kernel F2FS allows local users to prevent filesystem mounting after an abrupt power loss. A missing node_write read lock lets an atomic fsync rewrite a node folio after a concurrent checkpoint has already marked its NAT entry as checkpointed, leaving recovery metadata inconsistent. Triggering the failure requires an atomic file commit to overlap a checkpoint and then an abrupt power loss; the resulting reboot can fail to mount the affected F2FS filesystem with -EINVAL.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux Kernel F2FS allows local users to prevent filesystem mounting after an abrupt power loss. A missing node_write read lock lets an atomic fsync rewrite a node folio after a concurrent checkpoint has already marked its NAT entry as checkpointed, leaving recovery metadata inconsistent. Triggering the failure requires an atomic file commit to overlap a checkpoint and then an abrupt power loss; the resulting reboot can fail to mount the affected F2FS filesystem with -EINVAL.

The record

CVE
CVE-2026-23267
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.7
  2. Affected versionversion=608514deba38c8611ad330d6a3c8e2b9a1f68e4b <32bc3c9fe18881d50dd51fd5f26d19fe1190dc0d
  3. Affected versionversion=608514deba38c8611ad330d6a3c8e2b9a1f68e4b <75e19da068adf0dc5dd269dd157392434b9117d4
  4. Affected versionversion=608514deba38c8611ad330d6a3c8e2b9a1f68e4b <7633a7387eb4d0259d6bea945e1d3469cd135bbc
  5. Affected versionversion=608514deba38c8611ad330d6a3c8e2b9a1f68e4b <962c167b0f262b9962207fbeaa531721d55ea00e
  6. Affected versionversion=608514deba38c8611ad330d6a3c8e2b9a1f68e4b <bd66b4c487d5091d2a65d6089e0de36f0c26a4c7
  7. Affected versionversion=608514deba38c8611ad330d6a3c8e2b9a1f68e4b <ed81bc5885460905f9160e7b463e5708fd056324

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.7; version=608514deba38c8611ad330d6a3c8e2b9a1f68e4b <32bc3c9fe18881d50dd51fd5f26d19fe1190dc0d; version=608514deba38c8611ad330d6a3c8e2b9a1f68e4b <75e19da068adf0dc5dd269dd157392434b9117d4; version=608514deba38c8611ad330d6a3c8e2b9a1f68e4b <7633a7387eb4d0259d6bea945e1d3469cd135bbc; version=608514deba38c8611ad330d6a3c8e2b9a1f68e4b <962c167b0f262b9962207fbeaa531721d55ea00e; version=608514deba38c8611ad330d6a3c8e2b9a1f68e4b <bd66b4c487d5091d2a65d6089e0de36f0c26a4c7; version=608514deba38c8611ad330d6a3c8e2b9a1f68e4b <ed81bc5885460905f9160e7b463e5708fd056324

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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

T1499.004Application 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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