CVE-2025-38236Public exploit

Local privilege escalation via stale AF_UNIX OOB pointer

Published Jul 8, 2025 · Updated Aug 5, 2026

Use-after-free in affected Linux kernel AF_UNIX stream-socket code allows local users to disclose or corrupt kernel memory. The SO_PEEK_OFF loop treats a zero-length consumed OOB skb as progress, advances to a live OOB skb, and frees it while a stale oob_skb pointer remains. Any unprivileged local process can trigger the deterministic socket sequence without user interaction; affected Siemens controllers inherit the flaw through their additional GNU/Linux subsystem.

CVSS severity7.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in affected Linux kernel AF_UNIX stream-socket code allows local users to disclose or corrupt kernel memory. The SO_PEEK_OFF loop treats a zero-length consumed OOB skb as progress, advances to a live OOB skb, and frees it while a stale oob_skb pointer remains. Any unprivileged local process can trigger the deterministic socket sequence without user interaction; affected Siemens controllers inherit the flaw through their additional GNU/Linux subsystem.

The record

CVE
CVE-2025-38236
Published
Jul 8, 2025
Updated
Aug 5, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 8, 2025CVE 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=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=V3.1.5 <*
The Linux Kernel Organization · Linuxversion=314001f0bf927015e459c9d387d62a231fe93af3 <32ca245464e1479bfea8592b9db227fdc1641705; version=314001f0bf927015e459c9d387d62a231fe93af3 <523edfed4f68b7794d85b9ac828c5f8f4442e4c5; version=314001f0bf927015e459c9d387d62a231fe93af3 <61a9ad7b69ce688697e5f63332f03e17725353bc; version=314001f0bf927015e459c9d387d62a231fe93af3 <8db4d2d026e6e3649832bfe23b96c4acff0756db; version=314001f0bf927015e459c9d387d62a231fe93af3 <a12237865b48a73183df252029ff5065d73d305e; version=314001f0bf927015e459c9d387d62a231fe93af3 <fad0a2c16062ac7c606b93166a7ce9d265bab976; version=5.15
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.5 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*

Published CVSS scores

7.8Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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 exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

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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