CVE-2024-38615

Local kernel crash via null cpufreq callback

Published Jun 19, 2024 · Updated May 12, 2026

NULL pointer dereference in Linux cpufreq allows local users to crash the kernel during CPU-frequency policy teardown on affected systems. The cpufreq core calls a driver's optional exit callback without first verifying that the function pointer is valid, and it fails to clear policy->freq_table when no callback exists. Reachability requires local access and teardown of a cpufreq policy using a driver without an exit callback; the documented consequence is service interruption from a kernel failure.

CVSS severity5.5
Medium
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

NULL pointer dereference in Linux cpufreq allows local users to crash the kernel during CPU-frequency policy teardown on affected systems. The cpufreq core calls a driver's optional exit callback without first verifying that the function pointer is valid, and it fails to clear policy->freq_table when no callback exists. Reachability requires local access and teardown of a cpufreq policy using a driver without an exit callback; the documented consequence is service interruption from a kernel failure.

The record

CVE
CVE-2024-38615
Published
Jun 19, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-476, CWE-20, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 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=5.1; version=91a12e91dc39137906d929a4ff6f9c32c59697fa <2d730b465e377396d2a09a53524b96b111f7ccb6; version=91a12e91dc39137906d929a4ff6f9c32c59697fa <35db5e76d5e9f752476df5fa0b9018a2398b0378; version=91a12e91dc39137906d929a4ff6f9c32c59697fa <3e99f060cfd2e36504d62c9132b453ade5027e1c; version=91a12e91dc39137906d929a4ff6f9c32c59697fa <8bc9546805e572ad101681437a49939f28777273; version=91a12e91dc39137906d929a4ff6f9c32c59697fa <a8204d1b6ff762d2171d365c2c8560285d0a233d; version=91a12e91dc39137906d929a4ff6f9c32c59697fa <ae37ebca325097d773d7bb6ec069123b30772872; version=91a12e91dc39137906d929a4ff6f9c32c59697fa <b8f85833c05730d631576008daaa34096bc7f3ce; version=91a12e91dc39137906d929a4ff6f9c32c59697fa <dfc56ff5ec9904c008e9376d90a6d7e2d2bec4d3
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.1
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.1

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4OracleCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
5.5Siemens ProductCERTCVSS: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 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
CWE-20Improper Input Validation
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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