CVE-2024-40950

Service interruption via anonymous THP split failure

Published Jul 12, 2024 · Updated May 11, 2026

Improper folio handling in Linux 6.9 through 6.9.6 allows local users to interrupt service by triggering anonymous THP split failure. split_huge_page_to_list_to_order passes anonymous folios to mapping_large_folio_support without first applying the required folio_test_anon check. Reachability requires local low-privileged access and the affected large-folio code; the demonstrated result is a failed split and kernel warning.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper folio handling in Linux 6.9 through 6.9.6 allows local users to interrupt service by triggering anonymous THP split failure. split_huge_page_to_list_to_order passes anonymous folios to mapping_large_folio_support without first applying the required folio_test_anon check. Reachability requires local low-privileged access and the affected large-folio code; the demonstrated result is a failed split and kernel warning.

The record

CVE
CVE-2024-40950
Published
Jul 12, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-99, T1499
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=6.9
  2. Affected versionversion=c010d47f107f609b9f4d6a103b6dfc53889049e9 <5df493a99fcf887133cf01d23cd4bebb6d385d3c
  3. Affected versionversion=c010d47f107f609b9f4d6a103b6dfc53889049e9 <6a50c9b512f7734bc356f4bd47885a6f7c98491a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.9; version=c010d47f107f609b9f4d6a103b6dfc53889049e9 <5df493a99fcf887133cf01d23cd4bebb6d385d3c; version=c010d47f107f609b9f4d6a103b6dfc53889049e9 <6a50c9b512f7734bc356f4bd47885a6f7c98491a

Published CVSS scores

5.5UbuntuCVSS: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.

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

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-99Resource Injection
T1499Endpoint Denial of Service

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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