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NVD / CVE Program· CNA Linux

CVE-2025-40226: firmware: arm_scmi: Account for failed debug initialization

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 2290ab43b9d8eafb8046387f10a8dfa2b030ba46, 554c9d5c6c695aedaecfb4365c187102709397b0, 6.6.115.

Low priority for now. Upgrade to Linux Linux 2290ab43b9d8eafb8046387f10a8dfa2b030ba46, 554c9d5c6c695aedaecfb4365c187102709397b0, 6.6.115 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Account for failed debug initialization When the SCMI debug subsystem fails to initialize, the related debug root will be missing, and the underlying descriptor will be NULL. Handle this fault condition in the SCMI debug helpers that maintain metrics counters.

—No exploit Fix available
Published
Dec 4, 2025
Updated
Oct 19, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.12affected
    • b38812942556819263256cb77fbdc9eae7aa5b1b and later · before d719ce9f286c439795cd2beee4c91f12b84bc5a0affected · git
    • 0b3d48c4726e1b20dffd2ff81a9d94d5d930220b and later · before e088efcd97cb7c7297d166bb52c3b87a29f6a0b1affected · git
    • 0b3d48c4726e1b20dffd2ff81a9d94d5d930220b and later · before 554c9d5c6c695aedaecfb4365c187102709397b0affected · git
    • 0b3d48c4726e1b20dffd2ff81a9d94d5d930220b and later · before 2290ab43b9d8eafb8046387f10a8dfa2b030ba46affected · git
    • 6.6.92 and later · before 6.6.115affected · semver
    • before 6.12not affected · semver
    • 6.6.115 and later · up to and including 6.6.*not affected · semver
    • 6.12.56 and later · up to and including 6.12.*not affected · semver
    • 6.17.6 and later · up to and including 6.17.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.57-16.12.57-1
Debian:14linuxbefore 6.17.6-16.17.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-40224Dec 4, 2025 · hwmon: (cgbc-hwmon) Add missing NULL check after devm_kzalloc()
    0Monitor
  • ← EarlierCVE-2025-40225Dec 4, 2025 · drm/panthor: Fix kernel panic on partial unmap of a GPU VA region
    0Monitor
  • Later →CVE-2025-40227Dec 4, 2025 · mm/damon/sysfs: dealloc commit test ctx always
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2290ab43b9d8eafb8046387f10a8dfa2b030ba46Vendor (CNA)
Linux Linux554c9d5c6c695aedaecfb4365c187102709397b0Vendor (CNA)
Linux Linux6.6.115Vendor (CNA)
Linux Linuxd719ce9f286c439795cd2beee4c91f12b84bc5a0Vendor (CNA)
Linux Linuxe088efcd97cb7c7297d166bb52c3b87a29f6a0b1Vendor (CNA)
debian:linux6.12.57-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records