CVE-2026-89898

Kernel memory corruption via unbounded serial message assembly

Published Sep 16, 2026 · Updated Sep 16, 2026

Out-of-bounds write in the Linux Extron CEC driver 6.12 allows physically proximate attackers to corrupt kernel memory via serial input. The receive path appends incoming bytes to the fixed-size cec_msg.msg array without rejecting an overlong malformed message. Reachability requires a configured Extron DA HD 4K PLUS adapter to deliver malformed serial data; the overwrite can corrupt adjacent kernel state and interrupt the host.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Out-of-bounds write in the Linux Extron CEC driver 6.12 allows physically proximate attackers to corrupt kernel memory via serial input. The receive path appends incoming bytes to the fixed-size cec_msg.msg array without rejecting an overlong malformed message. Reachability requires a configured Extron DA HD 4K PLUS adapter to deliver malformed serial data; the overwrite can corrupt adjacent kernel state and interrupt the host.

The record

CVE
CVE-2026-89898
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
physical
Privileges
unauthenticated

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=056f2821b631df2b94d3b017fd1e1eef918ed98d <00c13b4ab481a09d915d099815cff1b10926ddd9
  2. Affected versionversion=056f2821b631df2b94d3b017fd1e1eef918ed98d <673611cc2ab9769929644ce879f7ea34932a3011
  3. Affected versionversion=056f2821b631df2b94d3b017fd1e1eef918ed98d <7ad2fec276946a0dedfa54eb26fc38c4fc6a6034
  4. Affected versionversion=056f2821b631df2b94d3b017fd1e1eef918ed98d <abac9820b26b5cfcb01eb79efe2abdd0ac7e07c3
  5. Affected versionversion=6.12

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=056f2821b631df2b94d3b017fd1e1eef918ed98d <00c13b4ab481a09d915d099815cff1b10926ddd9; version=056f2821b631df2b94d3b017fd1e1eef918ed98d <673611cc2ab9769929644ce879f7ea34932a3011; version=056f2821b631df2b94d3b017fd1e1eef918ed98d <7ad2fec276946a0dedfa54eb26fc38c4fc6a6034; version=056f2821b631df2b94d3b017fd1e1eef918ed98d <abac9820b26b5cfcb01eb79efe2abdd0ac7e07c3; version=6.12

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
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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