CVE-2024-42250

Local service interruption via unlocked CacheFiles request traversal

Published Aug 7, 2024 · Updated Aug 5, 2026

Improper locking in CacheFiles in Linux kernel 6.8 through 6.9.9 allows local users to interrupt service during on-demand polling. In cachefiles_daemon_poll, an RCU read lock pins only the xarray slot while the routine dereferences an unpinned cachefiles_req, allowing its lifetime to race with iteration. Exploitation requires local low-privileged access and CacheFiles on-demand mode; published sources do not specify whether availability loss appears as a crash or hang.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in CacheFiles in Linux kernel 6.8 through 6.9.9 allows local users to interrupt service during on-demand polling. In cachefiles_daemon_poll, an RCU read lock pins only the xarray slot while the routine dereferences an unpinned cachefiles_req, allowing its lifetime to race with iteration. Exploitation requires local low-privileged access and CacheFiles on-demand mode; published sources do not specify whether availability loss appears as a crash or hang.

The record

CVE
CVE-2024-42250
Published
Aug 7, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, 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=0e19a18f998dcabe8be590e0b39660a1f230209b <97cfd5e20ddc2e33e16ce369626ce76c9a475fd7
  2. Affected versionversion=18943864342705fa18dd4e6b8d608491fec81f6e <6bb6bd3dd6f382dfd36220d4b210a0c77c066651
  3. Affected versionversion=6.8
  4. Affected versionversion=b817e22b2e91257ace32a6768c3c003faeaa1c5c <8eadcab7f3dd809edbe5ae20533ff843dfea3a07
  5. Affected versionversion=b817e22b2e91257ace32a6768c3c003faeaa1c5c <cf5bb09e742a9cf6349127e868329a8f69b7a014

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0e19a18f998dcabe8be590e0b39660a1f230209b <97cfd5e20ddc2e33e16ce369626ce76c9a475fd7; version=18943864342705fa18dd4e6b8d608491fec81f6e <6bb6bd3dd6f382dfd36220d4b210a0c77c066651; version=6.8; version=b817e22b2e91257ace32a6768c3c003faeaa1c5c <8eadcab7f3dd809edbe5ae20533ff843dfea3a07; version=b817e22b2e91257ace32a6768c3c003faeaa1c5c <cf5bb09e742a9cf6349127e868329a8f69b7a014

Published CVSS scores

5.5CanonicalCVSS: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 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

CWE-667Improper Locking
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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