CVE-2024-42234

System crash via deferred-split migration double-free race

Published Aug 7, 2024 · Updated Aug 5, 2026

Double-free in Linux kernel 6.7 through 6.9.9 allows local users to crash the system by racing folio migration with deferred splitting. deferred_split_scan() moves folios to a local list without split_queue_lock, leaving folio_migrate_mapping() able to race an old folio whose reference count is frozen at zero. The race requires concurrent large-folio migration and deferred splitting; successful triggering produces kernel BUG/WARN states, double frees, and a system crash.

CVSS severity5.5
Medium
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

Double-free in Linux kernel 6.7 through 6.9.9 allows local users to crash the system by racing folio migration with deferred splitting. deferred_split_scan() moves folios to a local list without split_queue_lock, leaving folio_migrate_mapping() able to race an old folio whose reference count is frozen at zero. The race requires concurrent large-folio migration and deferred splitting; successful triggering produces kernel BUG/WARN states, double frees, and a system crash.

The record

CVE
CVE-2024-42234
Published
Aug 7, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=6.7
  2. Affected versionversion=9bcef5973e31020e5aa8571eb994d67b77318356 <be9581ea8c058d81154251cb0695987098996cad
  3. Affected versionversion=9bcef5973e31020e5aa8571eb994d67b77318356 <fc7facce686b64201dbf0b9614cc1d0bfad70010

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=9bcef5973e31020e5aa8571eb994d67b77318356 <be9581ea8c058d81154251cb0695987098996cad; version=9bcef5973e31020e5aa8571eb994d67b77318356 <fc7facce686b64201dbf0b9614cc1d0bfad70010

Published CVSS scores

5.5NISTCVSS: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.

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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-415Double Free
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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