CVE-2024-40900

Local kernel memory corruption via request-flush race

Published Jul 12, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel CacheFiles subsystem allows local users to trigger unspecified impact through a request-flush race. cachefiles_flush_reqs completes and frees an on-demand request but leaves it in cache->reqs, allowing cachefiles_ondemand_select_req to dereference the freed request while another daemon thread reads it. Reachability requires local low-privilege access and concurrent use of the CacheFiles on-demand interface; the public record establishes no specific post-corruption consequence.

CVSS severity7.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel CacheFiles subsystem allows local users to trigger unspecified impact through a request-flush race. cachefiles_flush_reqs completes and frees an on-demand request but leaves it in cache->reqs, allowing cachefiles_ondemand_select_req to dereference the freed request while another daemon thread reads it. Reachability requires local low-privilege access and concurrent use of the CacheFiles on-demand interface; the public record establishes no specific post-corruption consequence.

The record

CVE
CVE-2024-40900
Published
Jul 12, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 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=5.19
  2. Affected versionversion=c8383054506c77b814489c09877b5db83fd4abf2 <0fc75c5940fa634d84e64c93bfc388e1274ed013
  3. Affected versionversion=c8383054506c77b814489c09877b5db83fd4abf2 <37e19cf86a520d65de1de9cb330415c332a40d19
  4. Affected versionversion=c8383054506c77b814489c09877b5db83fd4abf2 <50d0e55356ba5b84ffb51c42704126124257e598
  5. Affected versionversion=c8383054506c77b814489c09877b5db83fd4abf2 <9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=c8383054506c77b814489c09877b5db83fd4abf2 <0fc75c5940fa634d84e64c93bfc388e1274ed013; version=c8383054506c77b814489c09877b5db83fd4abf2 <37e19cf86a520d65de1de9cb330415c332a40d19; version=c8383054506c77b814489c09877b5db83fd4abf2 <50d0e55356ba5b84ffb51c42704126124257e598; version=c8383054506c77b814489c09877b5db83fd4abf2 <9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7

Published CVSS scores

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

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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