CVE-2025-37964

Memory corruption and disclosure via skipped TLB flushes

Published May 20, 2025 · Updated Sep 8, 2026

Improper input validation in Linux and Siemens SIMATIC and SIPLUS controllers allows local users to corrupt or disclose memory. During an x86 mm switch, should_flush_tlb() incorrectly suppresses the shootdown after load_new_mm_cr3() clears need_flush but before loaded_mm records the new address space. Exploitation requires local low-privileged access and a high-complexity race; stale translations can alter or expose memory and interrupt the affected system.

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 input validation in Linux and Siemens SIMATIC and SIPLUS controllers allows local users to corrupt or disclose memory. During an x86 mm switch, should_flush_tlb() incorrectly suppresses the shootdown after load_new_mm_cr3() clears need_flush but before loaded_mm records the new address space. Exploitation requires local low-privileged access and a high-complexity race; stale translations can alter or expose memory and interrupt the affected system.

The record

CVE
CVE-2025-37964
Published
May 20, 2025
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-20
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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=V3.1.6 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*
The Linux Kernel Organization · Linuxversion=3dbe889a1b829b4c07e0836ff853fe649e51ce4f <d87392094f96e162fa5fa5a8640d70cc0952806f; version=5.15.179 <5.15.183; version=6.1.129 <6.1.139; version=6.12.16 <6.12.29; version=6.13.4 <6.14; version=6.14; version=6.6.79 <6.6.91; version=6db2526c1d694c91c6e05e2f186c085e9460f202 <399ec9ca8fc4999e676ff89a90184ec40031cf59; version=6db2526c1d694c91c6e05e2f186c085e9460f202 <fea4e317f9e7e1f449ce90dedc27a2d2a95bee5a; version=848b5815177582de0e1d0118725378e0fbadca20 <12f703811af043d32b1c8a30001b2fa04d5cd0ac; version=a04fe3bfc71e28009e20357b79df1e8ef7c9d600 <d41072906abec8bb8e01ed16afefbaa558908c89; version=b47002ed65ade940839b7f439ff4a194e7d5ec28 <02ad4ce144bd27f71f583f667fdf3b3ba0753477; version=d1347977661342cb09a304a17701eb2d4aa21dec
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.6 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*

Published CVSS scores

7.0Siemens ProductCERTCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5NIST NVDCVSS: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-20Improper Input Validation

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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