CVE-2024-56678

Erroneous KFENCE reports via nofault mishandling

Published Dec 28, 2024 · Updated May 11, 2026

Fault-handling error in affected Linux kernel releases allows local users with /proc/kcore access to trigger erroneous KFENCE reports. On powerpc systems, ___do_page_fault() sends faults from copy_from_kernel_nofault() to KFENCE instead of honoring the nofault exception-table fixup when /proc/kcore crosses an unmapped KFENCE object. Reaching the fault requires root-readable /proc/kcore and an enabled KFENCE allocation; the observed consequence is a false invalid-read or use-after-free diagnostic, not a published memory disclosure.

CVSS severity7.8
High
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

Fault-handling error in affected Linux kernel releases allows local users with /proc/kcore access to trigger erroneous KFENCE reports. On powerpc systems, ___do_page_fault() sends faults from copy_from_kernel_nofault() to KFENCE instead of honoring the nofault exception-table fixup when /proc/kcore crosses an unmapped KFENCE object. Reaching the fault requires root-readable /proc/kcore and an enabled KFENCE allocation; the observed consequence is a false invalid-read or use-after-free diagnostic, not a published memory disclosure.

The record

CVE
CVE-2024-56678
Published
Dec 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 28, 2024CVE 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=5.13
  2. Affected versionversion=90cbac0e995dd92f7bcf82f74aa50250bf194a4a <06dbbb4d5f7126b6307ab807cbf04ecfc459b933
  3. Affected versionversion=90cbac0e995dd92f7bcf82f74aa50250bf194a4a <15f78d2c3d1452645bd8b9da909b0ca266f83c43
  4. Affected versionversion=90cbac0e995dd92f7bcf82f74aa50250bf194a4a <4d2655754e94741b159aa807b72ea85518a65fd5
  5. Affected versionversion=90cbac0e995dd92f7bcf82f74aa50250bf194a4a <7eaeb7a49b6d16640f9f3c9074c05175d74c710b
  6. Affected versionversion=90cbac0e995dd92f7bcf82f74aa50250bf194a4a <9ea8d8bf9b625e8ad3be6b0432aecdc549914121
  7. Affected versionversion=90cbac0e995dd92f7bcf82f74aa50250bf194a4a <e0a470b5733c1fe068d5c58b0bb91ad539604bc6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=90cbac0e995dd92f7bcf82f74aa50250bf194a4a <06dbbb4d5f7126b6307ab807cbf04ecfc459b933; version=90cbac0e995dd92f7bcf82f74aa50250bf194a4a <15f78d2c3d1452645bd8b9da909b0ca266f83c43; version=90cbac0e995dd92f7bcf82f74aa50250bf194a4a <4d2655754e94741b159aa807b72ea85518a65fd5; version=90cbac0e995dd92f7bcf82f74aa50250bf194a4a <7eaeb7a49b6d16640f9f3c9074c05175d74c710b; version=90cbac0e995dd92f7bcf82f74aa50250bf194a4a <9ea8d8bf9b625e8ad3be6b0432aecdc549914121; version=90cbac0e995dd92f7bcf82f74aa50250bf194a4a <e0a470b5733c1fe068d5c58b0bb91ad539604bc6

Published CVSS scores

7.8UbuntuCVSS: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 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

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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