CVE-2024-40935

Local denial of service via unflushed CacheFiles requests

Published Jul 12, 2024 · Updated May 11, 2026

Denial of service in Linux kernel CacheFiles from 5.19 allows local users to hang a kernel task through ondemand cache I/O. After cachefiles_io_error() marks a cache CACHEFILES_DEAD, cachefiles_daemon_write() returns -EIO without flushing pending open requests. Exploitation requires local access to an ondemand CacheFiles daemon with an open request in flight; the waiting kernel process then remains hung.

CVSS severity7.8
High
EPSS probability0.26%
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 CacheFiles from 5.19 allows local users to hang a kernel task through ondemand cache I/O. After cachefiles_io_error() marks a cache CACHEFILES_DEAD, cachefiles_daemon_write() returns -EIO without flushing pending open requests. Exploitation requires local access to an ondemand CacheFiles daemon with an open request in flight; the waiting kernel process then remains hung.

The record

CVE
CVE-2024-40935
Published
Jul 12, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 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=5.19
  2. Affected versionversion=c8383054506c77b814489c09877b5db83fd4abf2 <320ba9cbca78be79c912143bbba1d1b35ca55cf0
  3. Affected versionversion=c8383054506c77b814489c09877b5db83fd4abf2 <3bf0b8030296e9ee60d3d4c15849ad9ac0b47081
  4. Affected versionversion=c8383054506c77b814489c09877b5db83fd4abf2 <85e833cd7243bda7285492b0653c3abb1e2e757b
  5. Affected versionversion=c8383054506c77b814489c09877b5db83fd4abf2 <e73fac95084839c5178d97e81c6a2051251bdc00

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=c8383054506c77b814489c09877b5db83fd4abf2 <320ba9cbca78be79c912143bbba1d1b35ca55cf0; version=c8383054506c77b814489c09877b5db83fd4abf2 <3bf0b8030296e9ee60d3d4c15849ad9ac0b47081; version=c8383054506c77b814489c09877b5db83fd4abf2 <85e833cd7243bda7285492b0653c3abb1e2e757b; version=c8383054506c77b814489c09877b5db83fd4abf2 <e73fac95084839c5178d97e81c6a2051251bdc00

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8NIST NVDCVSS: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 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-416Use After 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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