CVE-2024-42094

Local memory disclosure and crash via stack cpumask

Published Jul 29, 2024 · Updated May 12, 2026

Stack overflow in the Linux kernel net/iucv subsystem allows local users to disclose kernel memory or crash CONFIG_CPUMASK_OFFSTACK builds. The IUCV code declares an explicit cpumask variable on the kernel stack instead of using the configuration-neutral cpumask_var allocation API. Exploitation requires local access and a kernel built with CONFIG_CPUMASK_OFFSTACK; impact is limited to confidentiality and service interruption.

CVSS severity7.1
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in the Linux kernel net/iucv subsystem allows local users to disclose kernel memory or crash CONFIG_CPUMASK_OFFSTACK builds. The IUCV code declares an explicit cpumask variable on the kernel stack instead of using the configuration-neutral cpumask_var allocation API. Exploitation requires local access and a kernel built with CONFIG_CPUMASK_OFFSTACK; impact is limited to confidentiality and service interruption.

The record

CVE
CVE-2024-42094
Published
Jul 29, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-20, T0814, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 29, 2024CVE publishedPublication date reported by the CVE source.
  2. May 12, 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=2356f4cb191100a5e92d537f13e5efdbc697e9cb <0af718a690acc089aa1bbb95a93df833d864ef53; version=2356f4cb191100a5e92d537f13e5efdbc697e9cb <2b085521be5292016097b5e7ca81b26be3f7098d; version=2356f4cb191100a5e92d537f13e5efdbc697e9cb <2d090c7f7be3b26fcb80ac04d08a4a8062b1d959; version=2356f4cb191100a5e92d537f13e5efdbc697e9cb <724e7965af054079242b8d6f7e50ee226730a756; version=2356f4cb191100a5e92d537f13e5efdbc697e9cb <842afb47d84536fc976fece8fb6c54bea711ad1a; version=2356f4cb191100a5e92d537f13e5efdbc697e9cb <9dadab0db7d904413ea1cdaa13f127da05c31e71; version=2356f4cb191100a5e92d537f13e5efdbc697e9cb <be4e1304419c99a164b4c0e101c7c2a756b635b9; version=2356f4cb191100a5e92d537f13e5efdbc697e9cb <d85ca8179a54ff8cf1e1f8c3c9e3799831319bae; version=2.6.21
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.1
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.1

Published CVSS scores

7.1Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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-20Improper Input Validation
T0814Denial of Service
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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