CVE-2023-53306

Kernel warning via dirty DAX entry invalidation

Published Sep 16, 2025 · Updated May 11, 2026

Improper state handling in Linux 6.2 allows local users to trigger a kernel warning through XFS copy-on-write activity. The fs/DAX fault path invalidates a memory-written non-shared extent while its DAX entry remains dirty, causing dax_insert_entry to emit the warning. Reachability requires an XFS filesystem using DAX and a memory-mapped write followed by copy-on-write; service interruption occurs if the host is configured to panic on warnings.

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

Improper state handling in Linux 6.2 allows local users to trigger a kernel warning through XFS copy-on-write activity. The fs/DAX fault path invalidates a memory-written non-shared extent while its DAX entry remains dirty, causing dax_insert_entry to emit the warning. Reachability requires an XFS filesystem using DAX and a memory-mapped write followed by copy-on-write; service interruption occurs if the host is configured to panic on warnings.

The record

CVE
CVE-2023-53306
Published
Sep 16, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=6.2
  2. Affected versionversion=f80e1668888f34c0764822e74953c997daf2ccdb <f76b3a32879de215ced3f8c754c4077b0c2f79e3
  3. Affected versionversion=f80e1668888f34c0764822e74953c997daf2ccdb <fac05f800abb63dc4d7cc48fe7edf16e0520dc1f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=f80e1668888f34c0764822e74953c997daf2ccdb <f76b3a32879de215ced3f8c754c4077b0c2f79e3; version=f80e1668888f34c0764822e74953c997daf2ccdb <fac05f800abb63dc4d7cc48fe7edf16e0520dc1f

Published CVSS scores

5.5CISACVSS: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.

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

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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