CVE-2024-26621

Local denial of service via forced THP alignment

Published Mar 2, 2024 · Updated Aug 5, 2026

Denial of service in Linux 6.7 allows local users to exhaust 32-bit virtual address space through oversized anonymous mappings. The thp_get_unmapped_area path in mm/huge_memory.c forces large anonymous mappings onto transparent-huge-page boundaries without exempting constrained 32-bit address spaces. Exploitation requires local low-privileged code in a 32-bit kernel or compat process and can cause mapping failures that interrupt the affected process.

CVSS severity5.5
Medium
EPSS probability1.01%
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 6.7 allows local users to exhaust 32-bit virtual address space through oversized anonymous mappings. The thp_get_unmapped_area path in mm/huge_memory.c forces large anonymous mappings onto transparent-huge-page boundaries without exempting constrained 32-bit address spaces. Exploitation requires local low-privileged code in a 32-bit kernel or compat process and can cause mapping failures that interrupt the affected process.

The record

CVE
CVE-2024-26621
Published
Mar 2, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 2, 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=1854bc6e2420472676c5c90d3d6b15f6cd640e40 <4ef9ad19e17676b9ef071309bc62020e2373705d
  2. Affected versionversion=1854bc6e2420472676c5c90d3d6b15f6cd640e40 <6ea9aa8d97e6563676094cb35755884173269555
  3. Affected versionversion=1854bc6e2420472676c5c90d3d6b15f6cd640e40 <7432376c913381c5f24d373a87ff629bbde94b47
  4. Affected versionversion=1854bc6e2420472676c5c90d3d6b15f6cd640e40 <87632bc9ecff5ded93433bc0fca428019bdd1cfe
  5. Affected versionversion=5.18

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1854bc6e2420472676c5c90d3d6b15f6cd640e40 <4ef9ad19e17676b9ef071309bc62020e2373705d; version=1854bc6e2420472676c5c90d3d6b15f6cd640e40 <6ea9aa8d97e6563676094cb35755884173269555; version=1854bc6e2420472676c5c90d3d6b15f6cd640e40 <7432376c913381c5f24d373a87ff629bbde94b47; version=1854bc6e2420472676c5c90d3d6b15f6cd640e40 <87632bc9ecff5ded93433bc0fca428019bdd1cfe; version=5.18

Published CVSS scores

5.5NVDCVSS: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 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

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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