CVE-2025-22015Public exploit

Kernel state corruption via misclassified shmem folios

Published Apr 8, 2025 · Updated Sep 8, 2026

State corruption in affected Linux and Siemens MFP controller kernels allows local users to corrupt shmem xarray entries during folio migration. __folio_migrate_mapping() uses folio_test_swapbacked() to choose the entry count, conflating page-cache shmem folios with swap-cache folios and converting a sibling entry into a normal entry during xas_store(). Low-privileged local access is required, and the corrupted mapping state can interrupt system operation without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

State corruption in affected Linux and Siemens MFP controller kernels allows local users to corrupt shmem xarray entries during folio migration. __folio_migrate_mapping() uses folio_test_swapbacked() to choose the entry count, conflating page-cache shmem folios with swap-cache folios and converting a sibling entry into a normal entry during xas_store(). Low-privileged local access is required, and the corrupted mapping state can interrupt system operation without reported data disclosure or modification.

The record

CVE
CVE-2025-22015
Published
Apr 8, 2025
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-476
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 8, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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=07550b1461d4d0499165e7d6f7718cfd0e440427 <29124ae980e2860f0eec7355949d3d3292ee81da; version=6.1.71 <6.1.132; version=6.6.10 <6.6.85; version=6.7; version=be72d197b2281e2ee3f28017fc9be1ab17e26d16 <49100c0b070e900f87c8fac3be9b9ef8a30fa673; version=fc346d0a70a13d52fe1c4bc49516d83a42cd7c4c <60cf233b585cdf1f3c5e52d1225606b86acd08b0; version=fc346d0a70a13d52fe1c4bc49516d83a42cd7c4c <75cfb92eb63298d717b6b0118f91ba12c4fcfeb5; version=fc346d0a70a13d52fe1c4bc49516d83a42cd7c4c <c057ee03f751d6cecf7ee64f52f6545d94082aaa
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

5.5Siemens ProductCERTCVSS: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 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-476NULL Pointer Dereference

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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