CVE-2024-38780

Local service interruption via nested IRQ unlocking

Published Jun 21, 2024 · Updated May 23, 2026

Improper locking in the Linux kernel allows local users to interrupt service through access to the sw-sync debugfs interface. The sync_print_obj() path calls spin_unlock_irq() while nested inside sync_debugfs_show(), which already manages IRQ state, producing an inconsistent lock state. Exploitation requires local low-privileged access and reaches availability only; no confidentiality or integrity impact is reported.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux kernel allows local users to interrupt service through access to the sw-sync debugfs interface. The sync_print_obj() path calls spin_unlock_irq() while nested inside sync_debugfs_show(), which already manages IRQ state, producing an inconsistent lock state. Exploitation requires local low-privileged access and reaches availability only; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2024-38780
Published
Jun 21, 2024
Updated
May 23, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=V3.1.0 <V3.1.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.0 <V3.1.5
Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=4.14; version=4.9.68 <4.10; version=a6aa8fca4d792c72947e341d7842d2f700534335 <165b25e3ee9333f7b04f8db43895beacb51582ed; version=a6aa8fca4d792c72947e341d7842d2f700534335 <1ff116f68560a25656933d5a18e7619cb6773d8a; version=a6aa8fca4d792c72947e341d7842d2f700534335 <242b30466879e6defa521573c27e12018276c33a; version=a6aa8fca4d792c72947e341d7842d2f700534335 <8a283cdfc8beeb14024387a925247b563d614e1e; version=a6aa8fca4d792c72947e341d7842d2f700534335 <9d75fab2c14a25553a1664586ed122c316bd1878; version=a6aa8fca4d792c72947e341d7842d2f700534335 <a4ee78244445ab73af22bfc5a5fc543963b25aef; version=a6aa8fca4d792c72947e341d7842d2f700534335 <ae6fc4e6a3322f6d1c8ff59150d8469487a73dd8; version=a6aa8fca4d792c72947e341d7842d2f700534335 <b794918961516f667b0c745aebdfebbb8a98df39; version=f14ad42b8743897d140808467ed4ae3ce93bd0a5
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.0 <V3.1.5
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.1
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.1
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.0 <V3.1.5

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NISTCVSS: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 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-667Improper Locking
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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