CVE-2023-54247

Kernel warning via delayed DECL_TAG rejection

Published Dec 30, 2025 · Updated Dec 30, 2025

Improper BTF type handling in Linux 5.16 through 6.4.6 allows local users to trigger a kernel warning via a crafted BPF map request. btf_type_id_size() tests a DECL_TAG only after reaching WARN_ON_ONCE instead of classifying it as a no-size type and returning NULL earlier. The caller must be permitted to create BPF maps; the kernel rejects the type correctly, so the consequence is limited to a one-time diagnostic warning.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper BTF type handling in Linux 5.16 through 6.4.6 allows local users to trigger a kernel warning via a crafted BPF map request. btf_type_id_size() tests a DECL_TAG only after reaching WARN_ON_ONCE instead of classifying it as a no-size type and returning NULL earlier. The caller must be permitted to create BPF maps; the kernel rejects the type correctly, so the consequence is limited to a one-time diagnostic warning.

The record

CVE
CVE-2023-54247
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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 <61f4bd46a03a81865aca3bcbad2f7b7032fb3160
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7c4f5ab63e7962812505cbd38cc765168a223acb
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e6c2f594ed961273479505b42040782820190305

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <61f4bd46a03a81865aca3bcbad2f7b7032fb3160; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7c4f5ab63e7962812505cbd38cc765168a223acb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e6c2f594ed961273479505b42040782820190305

Published CVSS scores

No CVSS assessment is available in this record.

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

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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