CVE-2023-53262

Kernel fault via atomic-context F2FS decompression

Published Sep 15, 2025 · Updated Sep 15, 2025

Improper atomic-context scheduling in Linux F2FS allows local users to trigger a kernel fault during compressed-file reads. The f2fs_decompress_cluster error path calls f2fs_handle_error from read-completion context, which reaches f2fs_commit_super and waits on dirty-buffer I/O while execution remains atomic. Local access and an F2FS volume using compressed clusters are required; the observed consequence is a scheduling-while-atomic kernel fault.

CVSS severity7.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper atomic-context scheduling in Linux F2FS allows local users to trigger a kernel fault during compressed-file reads. The f2fs_decompress_cluster error path calls f2fs_handle_error from read-completion context, which reaches f2fs_commit_super and waits on dirty-buffer I/O while execution remains atomic. Local access and an F2FS volume using compressed clusters are required; the observed consequence is a scheduling-while-atomic kernel fault.

The record

CVE
CVE-2023-53262
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=6.0
  2. Affected versionversion=bff139b49d9f70c1ac5384aac94554846aa834de <1aa161e43106d46ca8e9a86f4aa28d420258134b
  3. Affected versionversion=bff139b49d9f70c1ac5384aac94554846aa834de <74f74c8b8419a289b85aa9c85e5f4d8c2cc9f5fb
  4. Affected versionversion=bff139b49d9f70c1ac5384aac94554846aa834de <977df5c13a4b253a718ec44a4eb957c612bf73f4
  5. Affected versionversion=bff139b49d9f70c1ac5384aac94554846aa834de <d2746c56dd2cc47f70cc3931977be556172c246d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=bff139b49d9f70c1ac5384aac94554846aa834de <1aa161e43106d46ca8e9a86f4aa28d420258134b; version=bff139b49d9f70c1ac5384aac94554846aa834de <74f74c8b8419a289b85aa9c85e5f4d8c2cc9f5fb; version=bff139b49d9f70c1ac5384aac94554846aa834de <977df5c13a4b253a718ec44a4eb957c612bf73f4; version=bff139b49d9f70c1ac5384aac94554846aa834de <d2746c56dd2cc47f70cc3931977be556172c246d

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

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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