CVE-2023-53447

Kernel crash via F2FS remount-fallocate race

Published Sep 18, 2025 · Updated Sep 18, 2025

Race condition in Linux F2FS allows local users to crash the kernel by racing a read-write remount against fallocate on the same filesystem. During f2fs_remount(), default_options() temporarily re-enables READ_EXTENT_CACHE before parse_options() restores the immutable setting, so concurrent f2fs_fallocate() follows a stale option into a NULL extent-tree lock. A local user needs write access to a file on an F2FS volume and must overlap fallocate with a privileged read-write remount; success causes a kernel fault and service interruption.

CVSS severity4.7
Medium
EPSS probability0.09%
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 F2FS allows local users to crash the kernel by racing a read-write remount against fallocate on the same filesystem. During f2fs_remount(), default_options() temporarily re-enables READ_EXTENT_CACHE before parse_options() restores the immutable setting, so concurrent f2fs_fallocate() follows a stale option into a NULL extent-tree lock. A local user needs write access to a file on an F2FS volume and must overlap fallocate with a privileged read-write remount; success causes a kernel fault and service interruption.

The record

CVE
CVE-2023-53447
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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 <115557cc226a927924f2d7d1980ccbf6e3b3bb36
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <458c15dfbce62c35fefd9ca637b20a051309c9f1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <115557cc226a927924f2d7d1980ccbf6e3b3bb36; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <458c15dfbce62c35fefd9ca637b20a051309c9f1

Published CVSS scores

4.7CanonicalCVSS:3.1/AV:L/AC:H/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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