CVE-2024-40936

Service interruption via leaked CXL memregion identifiers

Published Jul 12, 2024 · Updated May 11, 2026

Memory leak in the CXL region subsystem in Linux allows local users to exhaust memregion identifiers through invalid CXL region modes. The __create_region() path allocated an identifier before devm_cxl_add_region() rejected an unsupported mode, then returned without releasing that identifier. Triggering requires local access to a system with the CXL subsystem and a path supplying an unsupported mode; repeated failures can interrupt service.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the CXL region subsystem in Linux allows local users to exhaust memregion identifiers through invalid CXL region modes. The __create_region() path allocated an identifier before devm_cxl_add_region() rejected an unsupported mode, then returned without releasing that identifier. Triggering requires local access to a system with the CXL subsystem and a path supplying an unsupported mode; repeated failures can interrupt service.

The record

CVE
CVE-2024-40936
Published
Jul 12, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.3
  2. Affected versionversion=6e099264185d05f50400ea494f5029264a4fe995 <49ba7b515c4c0719b866d16f068e62d16a8a3dd1
  3. Affected versionversion=6e099264185d05f50400ea494f5029264a4fe995 <bbb5d8746381c82f7e0fb6171094d375b492f266
  4. Affected versionversion=6e099264185d05f50400ea494f5029264a4fe995 <d8316838aa0686da63a8be4194b7a17b0103ae4a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.3; version=6e099264185d05f50400ea494f5029264a4fe995 <49ba7b515c4c0719b866d16f068e62d16a8a3dd1; version=6e099264185d05f50400ea494f5029264a4fe995 <bbb5d8746381c82f7e0fb6171094d375b492f266; version=6e099264185d05f50400ea494f5029264a4fe995 <d8316838aa0686da63a8be4194b7a17b0103ae4a

Published CVSS scores

5.5NIST NVDCVSS: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-401Missing Release of Memory after Effective Lifetime
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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