CVE-2025-38471Network attack vector

Remote memory corruption via stale TLS queue access

Published Jul 28, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux kernel kTLS receive parser allows remote attackers to corrupt kernel memory via crafted TLS traffic. tls_strp_check_rcv follows a cached socket-buffer pointer after TCP compaction frees the old buffer instead of refreshing the receive queue. Exposure requires a kTLS-enabled receiving service, including the affected Siemens GNU/Linux subsystem; exploitation can crash the kernel or compromise data.

CVSS severity9.8
Critical
EPSS probability0.40%
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 the Linux kernel kTLS receive parser allows remote attackers to corrupt kernel memory via crafted TLS traffic. tls_strp_check_rcv follows a cached socket-buffer pointer after TCP compaction frees the old buffer instead of refreshing the receive queue. Exposure requires a kTLS-enabled receiving service, including the affected Siemens GNU/Linux subsystem; exploitation can crash the kernel or compromise data.

The record

CVE
CVE-2025-38471
Published
Jul 28, 2025
Updated
Aug 5, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-416, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*
The Linux Kernel Organization · Linuxversion=0d87bbd39d7fd1135ab9eca672d760470f6508e8 <1f3a429c21e0e43e8b8c55d30701e91411a4df02; version=0d87bbd39d7fd1135ab9eca672d760470f6508e8 <4ab26bce3969f8fd925fe6f6f551e4d1a508c68b; version=0d87bbd39d7fd1135ab9eca672d760470f6508e8 <730fed2ff5e259495712518e18d9f521f61972bb; version=0d87bbd39d7fd1135ab9eca672d760470f6508e8 <c76f6f437c46b2390888e0e1dc7aafafa9f4e0c6; version=0d87bbd39d7fd1135ab9eca672d760470f6508e8 <cdb767915fc9a15d88d19d52a1455f1dc3e5ddc8; version=2277d7cbdf47531b2c3cd01ba15255fa955aab35; version=6.0.6 <6.1; version=6.1
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
9.8Linux Kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1190Exploit Public-Facing Application

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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