CVE-2025-21645

Availability loss via unbalanced IRQ wake disable

Published Jan 19, 2025 · Updated Sep 8, 2026

Incorrect IRQ wake handling in Linux on affected AMD systems allows local users to disrupt availability by initiating S4 hibernation. The AMD PMC driver invokes amd_pmc_suspend_handler() for freeze and poweroff even though i8042 enables IRQ1 wake only for suspend. Reaching the warning requires an affected AMD platform to enter S4 after a fresh boot without first entering s2idle; the unbalanced wake_depth decrement triggers a kernel WARN.

CVSS severity6.8
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect IRQ wake handling in Linux on affected AMD systems allows local users to disrupt availability by initiating S4 hibernation. The AMD PMC driver invokes amd_pmc_suspend_handler() for freeze and poweroff even though i8042 enables IRQ1 wake only for suspend. Reaching the warning requires an affected AMD platform to enter S4 after a fresh boot without first entering s2idle; the unbalanced wake_depth decrement triggers a kernel WARN.

The record

CVE
CVE-2025-21645
Published
Jan 19, 2025
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-20, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 19, 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=3fc9dc0340e0b5df8059313537b55f82c1e84e94; version=5.15.95 <5.16; version=6.1.11 <6.1.140; version=6.2; version=72e5a83b7c8401856cc3732150af24e43726717a <ab47d72b736e78d3c2370b26e0bfc46eb0918391; version=8e60615e8932167057b363c11a7835da7f007106 <5cc621085e2b7a9b1905a98f8e5a86bb4aea2016; version=8e60615e8932167057b363c11a7835da7f007106 <b25778c87a6bce40c31e92364f08aa6240309e25; version=8e60615e8932167057b363c11a7835da7f007106 <dd410d784402c5775f66faf8b624e85e41c38aaf
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
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8Siemens ProductCERTCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499Endpoint Denial of Service

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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