CVE-2023-54056

Local kernel crash via kheaders archive read

Published Dec 24, 2025 · Updated Dec 24, 2025

Denial of service in Linux kernel kheaders allows local users to crash the kernel by reading the sysfs header archive. The ikheaders_read path passes the scalar-declared kernel_headers_data symbol to fortified memcpy as though it were a byte array, causing the bounds check to call fortify_panic. Exposure requires the kheaders interface and CONFIG_FORTIFY_SOURCE; reading the archive can panic the running kernel rather than disclose or modify data.

CVSS severityUnavailable
Unscored
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel kheaders allows local users to crash the kernel by reading the sysfs header archive. The ikheaders_read path passes the scalar-declared kernel_headers_data symbol to fortified memcpy as though it were a byte array, causing the bounds check to call fortify_panic. Exposure requires the kheaders interface and CONFIG_FORTIFY_SOURCE; reading the archive can panic the running kernel rather than disclose or modify data.

The record

CVE
CVE-2023-54056
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 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=43d8ce9d65a54846d378545770991e65838981e0 <4a07d2d511e2703efd4387891d49e0326f1157f3
  2. Affected versionversion=43d8ce9d65a54846d378545770991e65838981e0 <719459877d58c8aced5845c1e5b98d8d87d09197
  3. Affected versionversion=43d8ce9d65a54846d378545770991e65838981e0 <82d2e01b95c439fe55fab5e04fc83387c42d3a48
  4. Affected versionversion=43d8ce9d65a54846d378545770991e65838981e0 <b69edab47f1da8edd8e7bfdf8c70f51a2a5d89fb
  5. Affected versionversion=43d8ce9d65a54846d378545770991e65838981e0 <b9f6845a492de20679b84bda6b08be347c5819da
  6. Affected versionversion=43d8ce9d65a54846d378545770991e65838981e0 <d6d1af6b8611801b585c53c0cc63626c8d339e96
  7. Affected versionversion=43d8ce9d65a54846d378545770991e65838981e0 <fcd2da2e6bf2640a31a2a5b118b50dc3635c707b
  8. Affected versionversion=5.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=43d8ce9d65a54846d378545770991e65838981e0 <4a07d2d511e2703efd4387891d49e0326f1157f3; version=43d8ce9d65a54846d378545770991e65838981e0 <719459877d58c8aced5845c1e5b98d8d87d09197; version=43d8ce9d65a54846d378545770991e65838981e0 <82d2e01b95c439fe55fab5e04fc83387c42d3a48; version=43d8ce9d65a54846d378545770991e65838981e0 <b69edab47f1da8edd8e7bfdf8c70f51a2a5d89fb; version=43d8ce9d65a54846d378545770991e65838981e0 <b9f6845a492de20679b84bda6b08be347c5819da; version=43d8ce9d65a54846d378545770991e65838981e0 <d6d1af6b8611801b585c53c0cc63626c8d339e96; version=43d8ce9d65a54846d378545770991e65838981e0 <fcd2da2e6bf2640a31a2a5b118b50dc3635c707b; version=5.2

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

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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
PrivilegesUnavailable
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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