CVE-2025-40226

Kernel crash via missing SCMI debug descriptor

Published Dec 4, 2025 · Updated May 23, 2026

NULL pointer dereference in Linux 6.6.92 and 6.12 allows attackers to crash the kernel through unspecified vectors. SCMI metrics helpers dereference info->dbg to update counters even when failed debug initialization left that descriptor NULL. Reachability requires an ARM SCMI instance, enabled debug counters, failed debug initialization, and later traffic through an affected counter path.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux 6.6.92 and 6.12 allows attackers to crash the kernel through unspecified vectors. SCMI metrics helpers dereference info->dbg to update counters even when failed debug initialization left that descriptor NULL. Reachability requires an ARM SCMI instance, enabled debug counters, failed debug initialization, and later traffic through an affected counter path.

The record

CVE
CVE-2025-40226
Published
Dec 4, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 4, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=0b3d48c4726e1b20dffd2ff81a9d94d5d930220b <2290ab43b9d8eafb8046387f10a8dfa2b030ba46
  2. Affected versionversion=0b3d48c4726e1b20dffd2ff81a9d94d5d930220b <554c9d5c6c695aedaecfb4365c187102709397b0
  3. Affected versionversion=0b3d48c4726e1b20dffd2ff81a9d94d5d930220b <e088efcd97cb7c7297d166bb52c3b87a29f6a0b1
  4. Affected versionversion=6.12
  5. Affected versionversion=6.6.92 <6.6.115
  6. Affected versionversion=b38812942556819263256cb77fbdc9eae7aa5b1b <d719ce9f286c439795cd2beee4c91f12b84bc5a0

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0b3d48c4726e1b20dffd2ff81a9d94d5d930220b <2290ab43b9d8eafb8046387f10a8dfa2b030ba46; version=0b3d48c4726e1b20dffd2ff81a9d94d5d930220b <554c9d5c6c695aedaecfb4365c187102709397b0; version=0b3d48c4726e1b20dffd2ff81a9d94d5d930220b <e088efcd97cb7c7297d166bb52c3b87a29f6a0b1; version=6.12; version=6.6.92 <6.6.115; version=b38812942556819263256cb77fbdc9eae7aa5b1b <d719ce9f286c439795cd2beee4c91f12b84bc5a0

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.

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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)
VectorUnavailable
PrivilegesUnavailable
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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