CVE-2025-40165

ISI channel denial via imbalanced streaming cleanup

Published Nov 12, 2025 · Updated Aug 5, 2026

Improper streaming cleanup in the Linux imx8-isi M2M driver from 6.4 allows local users to leave an ISI channel unavailable. The stream-on path increments m2m usage_count, but an unmatched shutdown bypasses corresponding cleanup, so the count never reaches zero and the channel is not freed. Access to the NXP i.MX8 ISI V4L2 device and an imbalanced stream-on/stream-off sequence are required; inputs wider than 2K also trigger a kernel warning.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper streaming cleanup in the Linux imx8-isi M2M driver from 6.4 allows local users to leave an ISI channel unavailable. The stream-on path increments m2m usage_count, but an unmatched shutdown bypasses corresponding cleanup, so the count never reaches zero and the channel is not freed. Access to the NXP i.MX8 ISI V4L2 device and an imbalanced stream-on/stream-off sequence are required; inputs wider than 2K also trigger a kernel warning.

The record

CVE
CVE-2025-40165
Published
Nov 12, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=6.4
  2. Affected versionversion=cf21f328fcafacf4f96e7a30ef9dceede1076378 <178aa3360220231dd91e7dbc2eb984525886c9c1
  3. Affected versionversion=cf21f328fcafacf4f96e7a30ef9dceede1076378 <50c721be2cff2bf8c9a5f1f4add35c2bbb1df302
  4. Affected versionversion=cf21f328fcafacf4f96e7a30ef9dceede1076378 <b0d438c7b43314f9128e0dda5f83789e593e684a
  5. Affected versionversion=cf21f328fcafacf4f96e7a30ef9dceede1076378 <e8b5f4d80775835cf8192d65138e9be1ff202847

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=cf21f328fcafacf4f96e7a30ef9dceede1076378 <178aa3360220231dd91e7dbc2eb984525886c9c1; version=cf21f328fcafacf4f96e7a30ef9dceede1076378 <50c721be2cff2bf8c9a5f1f4add35c2bbb1df302; version=cf21f328fcafacf4f96e7a30ef9dceede1076378 <b0d438c7b43314f9128e0dda5f83789e593e684a; version=cf21f328fcafacf4f96e7a30ef9dceede1076378 <e8b5f4d80775835cf8192d65138e9be1ff202847

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

T1499Endpoint Denial of Service

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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