CVE-2024-38596

Local service interrupt via AF_UNIX shutdown race

Published Jun 19, 2024 · Updated May 12, 2026

Race condition in Linux and affected Siemens embedded systems allows local users to interrupt service through concurrent AF_UNIX operations. unix_release_sock writes sk->sk_shutdown atomically, but unix_stream_sendmsg reads the shared byte non-atomically, so simultaneous socket close and send paths observe inconsistent state. Exploitation requires local low-privileged access and a difficult race; published impact is limited to service interruption, with no reported data disclosure or modification.

CVSS severity4.7
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

Race condition in Linux and affected Siemens embedded systems allows local users to interrupt service through concurrent AF_UNIX operations. unix_release_sock writes sk->sk_shutdown atomically, but unix_stream_sendmsg reads the shared byte non-atomically, so simultaneous socket close and send paths observe inconsistent state. Exploitation requires local low-privileged access and a difficult race; published impact is limited to service interruption, with no reported data disclosure or modification.

The record

CVE
CVE-2024-38596
Published
Jun 19, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-362, 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=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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0688d4e499bee3f2749bca27329bd128686230cb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4d51845d734a4c5d079e56e0916f936a55e15055; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <540bf24fba16b88c1b3b9353927204b4f1074e25; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8299e4d778f664b31b67cf4cf3d5409de2ecb92c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9aa8773abfa0e954136875b4cbf2df4cf638e8a5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a4c88072abcaca593cefe70f90e9d3707526e8f9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a52fa2addfcccc2c5a0217fd45562605088c018b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <de6641d213373fbde9bbdd7c4b552254bc9f82fe; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fca6072e1a7b1e709ada5604b951513b89b4bd0a; version=2.6.12
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

4.7Siemens ProductCERTCVSS:3.1/AV:L/AC:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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