CVE-2025-21803

Kernel warnings via mutex-induced rescheduling

Published Feb 27, 2025 · Updated May 11, 2026

Interrupt-state mishandling in Linux 6.2 and later allows local users to trigger kernel warnings during LoongArch S3 suspend. The enable_gpe_wakeup() path calls a mutex-protected ACPI helper whose lock acquisition can reschedule, leaving interrupts enabled after the function returns. Reachability requires a LoongArch system entering S3; the published record reports warnings, while panic-on-warning configurations can turn a warning into a kernel panic.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Interrupt-state mishandling in Linux 6.2 and later allows local users to trigger kernel warnings during LoongArch S3 suspend. The enable_gpe_wakeup() path calls a mutex-protected ACPI helper whose lock acquisition can reschedule, leaving interrupts enabled after the function returns. Reachability requires a LoongArch system entering S3; the published record reports warnings, while panic-on-warning configurations can turn a warning into a kernel panic.

The record

CVE
CVE-2025-21803
Published
Feb 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=366bb35a8e48198cefcd3484ac6b2374d1347873 <194d26a5a43c26dc98a9b4e2c1d521dcb84dd1bf
  2. Affected versionversion=366bb35a8e48198cefcd3484ac6b2374d1347873 <26c0a2d93af55d30a46d5f45d3e9c42cde730168
  3. Affected versionversion=366bb35a8e48198cefcd3484ac6b2374d1347873 <8682a71a7f6de7c683f31b4334b04e19685a05f9
  4. Affected versionversion=366bb35a8e48198cefcd3484ac6b2374d1347873 <d49ab6857d98266010f3446c9c2063014db5b654
  5. Affected versionversion=6.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=366bb35a8e48198cefcd3484ac6b2374d1347873 <194d26a5a43c26dc98a9b4e2c1d521dcb84dd1bf; version=366bb35a8e48198cefcd3484ac6b2374d1347873 <26c0a2d93af55d30a46d5f45d3e9c42cde730168; version=366bb35a8e48198cefcd3484ac6b2374d1347873 <8682a71a7f6de7c683f31b4334b04e19685a05f9; version=366bb35a8e48198cefcd3484ac6b2374d1347873 <d49ab6857d98266010f3446c9c2063014db5b654; version=6.2

Published CVSS scores

No CVSS assessment is available in this record.

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 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

No sourced classifications are available.

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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