CVE-2025-38322

Local system crash via invalid perf metrics call

Published Jul 10, 2025 · Updated Sep 8, 2026

Improper input validation in the Linux kernel Intel perf subsystem allows local users to crash systems through a crafted perf event. The icl_update_topdown_event() path uses is_topdown_event() instead of is_topdown_count(), invoking perf-metrics reads on unsupported E-core CPUs. Low-privileged local access to perf events and an affected Intel hybrid CPU are required; successful triggering causes a hard lockup.

CVSS severity5.5
Medium
EPSS probability0.17%
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 the Linux kernel Intel perf subsystem allows local users to crash systems through a crafted perf event. The icl_update_topdown_event() path uses is_topdown_event() instead of is_topdown_count(), invoking perf-metrics reads on unsupported E-core CPUs. Low-privileged local access to perf events and an affected Intel hybrid CPU are required; successful triggering causes a hard lockup.

The record

CVE
CVE-2025-38322
Published
Jul 10, 2025
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-20, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 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=06cd7bfbb86e9db3e9013ea6636ad2c6f0a1664d; version=3a8bec6583e5239de3bd597ab382dc6c2b0c29a1 <e97c45c770f5e56c784a46c2a96ab968d26b97d9; version=6.1.134 <6.1.149; version=6.12.23 <6.12.49; version=6.13.11 <6.14; version=6.14.2 <6.15; version=6.15; version=6.6.87 <6.6.101; version=781b2db0eb7731fbde510c268b7ccc62959c3feb <702ea6028032d6c1fe96c2d4762a3575e3654819; version=d8370aa704bd7e384918c8f466856374725c0585; version=e7f6922c8a5b41522a8329ea6bbf815993b2dd28 <79e2dd573116d3338507c311460da9669095c94d; version=f9bdf1f953392c9edd69a7f884f78c0390127029 <a85cc69acdcb05f8cd226b8ea0778b8e2e887e6f; version=f9bdf1f953392c9edd69a7f884f78c0390127029 <b0823d5fbacb1c551d793cbfe7af24e0d1fa45ed
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.6 <*
Siemens · SIMATIC CN 4100version=0 <V5.0
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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 exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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