CVE-2024-40899

Kernel memory corruption via duplicate request processing

Published Jul 12, 2024 · Updated May 11, 2026

Use-after-free in CacheFiles on-demand mode in Linux 6.8 through 6.9.5 allows local users to corrupt kernel memory via a restore race. cachefiles_ondemand_restore re-marks a live request as new, allowing a second reader to retain it after cachefiles_ondemand_copen completes and frees it. The race requires an active on-demand cache and overlapping restore and open-request processing; successful exploitation can crash the kernel or alter protected memory.

CVSS severity7.8
High
EPSS probability0.28%
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 CacheFiles on-demand mode in Linux 6.8 through 6.9.5 allows local users to corrupt kernel memory via a restore race. cachefiles_ondemand_restore re-marks a live request as new, allowing a second reader to retain it after cachefiles_ondemand_copen completes and frees it. The race requires an active on-demand cache and overlapping restore and open-request processing; successful exploitation can crash the kernel or alter protected memory.

The record

CVE
CVE-2024-40899
Published
Jul 12, 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. 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=6.8
  2. Affected versionversion=9f5fa40f0924e9de85b16c6d1aea80327ce647d8 <a6de82765e12fb1201ab607f0d3ffe3309b30fc0
  3. Affected versionversion=a0cc87f86698174aacc083c4652d2606007dd902 <99e9c5bd27ddefa0f9db88625bf5e31c1e833d62
  4. Affected versionversion=e73fa11a356ca0905c3cc648eaacc6f0f2d2c8b3 <1d902d9a3aa4f2a8bda698294e34be788be012fc
  5. Affected versionversion=e73fa11a356ca0905c3cc648eaacc6f0f2d2c8b3 <de3e26f9e5b76fc628077578c001c4a51bf54d06

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.8; version=9f5fa40f0924e9de85b16c6d1aea80327ce647d8 <a6de82765e12fb1201ab607f0d3ffe3309b30fc0; version=a0cc87f86698174aacc083c4652d2606007dd902 <99e9c5bd27ddefa0f9db88625bf5e31c1e833d62; version=e73fa11a356ca0905c3cc648eaacc6f0f2d2c8b3 <1d902d9a3aa4f2a8bda698294e34be788be012fc; version=e73fa11a356ca0905c3cc648eaacc6f0f2d2c8b3 <de3e26f9e5b76fc628077578c001c4a51bf54d06

Published CVSS scores

7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.4SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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.

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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