CVE-2025-40136

Kernel warning via unregistered reserved VF interrupt

Published Nov 12, 2025 · Updated May 11, 2026

Improper interrupt handling in the Linux HiSilicon QM driver before 6.17.3 allows local users to trigger a kernel warning. The VF path allocates reserved interrupt vector 3 but fails to register it, so teardown calls ARM64 KVM's its_free_ite on an unregistered vector. Reachability requires GICv4, HiSilicon QM virtual-function passthrough to a guest, and interrupt release; published evidence reports the warning but not a crash or reboot.

CVSS severity4.8
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper interrupt handling in the Linux HiSilicon QM driver before 6.17.3 allows local users to trigger a kernel warning. The VF path allocates reserved interrupt vector 3 but fails to register it, so teardown calls ARM64 KVM's its_free_ite on an unregistered vector. Reachability requires GICv4, HiSilicon QM virtual-function passthrough to a guest, and interrupt release; published evidence reports the warning but not a crash or reboot.

The record

CVE
CVE-2025-40136
Published
Nov 12, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 12, 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=3536cc55cadaf2a03241915f9cfdaf6cd073e4fe <854da2b0df1654d63963d587b12fec6068d89643
  2. Affected versionversion=3536cc55cadaf2a03241915f9cfdaf6cd073e4fe <9228facb308157ac0bdd264b873187896f7a9c7a
  3. Affected versionversion=6.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3536cc55cadaf2a03241915f9cfdaf6cd073e4fe <854da2b0df1654d63963d587b12fec6068d89643; version=3536cc55cadaf2a03241915f9cfdaf6cd073e4fe <9228facb308157ac0bdd264b873187896f7a9c7a; version=6.1

Published CVSS scores

4.4SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
4.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/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 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

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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