CVE-2026-89900Hinoki check available

Kernel memory leak via lost CEC device reference

Published Sep 16, 2026 · Updated Sep 16, 2026

Resource leak in the CEC core in Linux 7.1 and affected stable branches allows attackers to retain kernel memory during adapter teardown. A NULL assignment clears adap->rc after rc_unregister_device(), preventing cec_delete_adapter() from passing the allocated device to rc_free_device(). Reachability requires teardown of an allocated CEC adapter, such as a dw-hdmi unbind, and each occurrence strands a kernel allocation rather than granting data access or code execution.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Resource leak in the CEC core in Linux 7.1 and affected stable branches allows attackers to retain kernel memory during adapter teardown. A NULL assignment clears adap->rc after rc_unregister_device(), preventing cec_delete_adapter() from passing the allocated device to rc_free_device(). Reachability requires teardown of an allocated CEC adapter, such as a dw-hdmi unbind, and each occurrence strands a kernel allocation rather than granting data access or code execution.

The record

CVE
CVE-2026-89900
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=6.12.93 <6.12.110
  2. Affected versionversion=6.18.35 <6.18.51
  3. Affected versionversion=6.6.143 <6.6.157
  4. Affected versionversion=7.1
  5. Affected versionversion=75977f5f5c4974c72bbedefbf09ad33ebbaa36f1 <f28a8e1ba4d67a18e4662e5acefd5a4389322366
  6. Affected versionversion=a7becb58f6b8a3a3efe5d3acfd52e2c107de6772 <954ee95a03b4d31d4505591bfaba02c24b75776b
  7. Affected versionversion=dccc0c3ddf8f16071736f98a7d6dd46a2d43e037 <a24ba0653f7154e671dc8d2bf64682ab2d042792
  8. Affected versionversion=dccc0c3ddf8f16071736f98a7d6dd46a2d43e037 <cca2407794795cecff7f8e5f5a79f4ef6b1d6f6c
  9. Affected versionversion=e250b672d40a9e0d97a8895cbb301248bea0fce6 <695063fc57574dd117b1bc750ca189cf03a2caad

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.12.93 <6.12.110; version=6.18.35 <6.18.51; version=6.6.143 <6.6.157; version=7.1; version=75977f5f5c4974c72bbedefbf09ad33ebbaa36f1 <f28a8e1ba4d67a18e4662e5acefd5a4389322366; version=a7becb58f6b8a3a3efe5d3acfd52e2c107de6772 <954ee95a03b4d31d4505591bfaba02c24b75776b; version=dccc0c3ddf8f16071736f98a7d6dd46a2d43e037 <a24ba0653f7154e671dc8d2bf64682ab2d042792; version=dccc0c3ddf8f16071736f98a7d6dd46a2d43e037 <cca2407794795cecff7f8e5f5a79f4ef6b1d6f6c; version=e250b672d40a9e0d97a8895cbb301248bea0fce6 <695063fc57574dd117b1bc750ca189cf03a2caad

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
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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