CVE-2024-40984

Kernel crash via truncated ACPICA region mapping

Published Jul 12, 2024 · Updated Aug 5, 2026

NULL pointer dereference in Linux kernel ACPICA allows local users to crash the system through a page-crossing operation-region access. The mapper stops at the page boundary but passes the original requested length to the read or write path, which accesses the unmapped remainder and dereferences NULL. Reaching the fault requires local low-privileged access and a crossing operation-region request; the demonstrated consequence is a kernel crash.

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

What happened

NULL pointer dereference in Linux kernel ACPICA allows local users to crash the system through a page-crossing operation-region access. The mapper stops at the page boundary but passes the original requested length to the read or write path, which accesses the unmapped remainder and dereferences NULL. Reaching the fault requires local low-privileged access and a crossing operation-region request; the demonstrated consequence is a kernel crash.

The record

CVE
CVE-2024-40984
Published
Jul 12, 2024
Updated
Aug 5, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-476, T1529
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=0 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=2.6.32; version=d410ee5109a1633a686a5663c6743a92e1181f9b <434c6b924e1f4c219aab2d9e05fe79c5364e37d3; version=d410ee5109a1633a686a5663c6743a92e1181f9b <435ecc978c3d5d0c4e172ec5b956dc1904061d98; version=d410ee5109a1633a686a5663c6743a92e1181f9b <6eca23100e9030725f69c1babacd58803f29ec8d; version=d410ee5109a1633a686a5663c6743a92e1181f9b <a83e1385b780d41307433ddbc86e3c528db031f0; version=d410ee5109a1633a686a5663c6743a92e1181f9b <ae465109d82f4fb03c5adbe85f2d6a6a3d59124c; version=d410ee5109a1633a686a5663c6743a92e1181f9b <dc5017c57f5eee80020c73ff8b67ba7f9fd08b1f; version=d410ee5109a1633a686a5663c6743a92e1181f9b <ddc1f5f124479360a1fd43f73be950781d172239; version=d410ee5109a1633a686a5663c6743a92e1181f9b <e21a4c9129c72fa54dd00f5ebf71219b41d43c04
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.1
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.1

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.

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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

CWE-476NULL Pointer Dereference
T1529System Shutdown/Reboot

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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