CVE-2026-89965Hinoki check available

Kernel crash via undersized BTT lane arrays

Published Sep 16, 2026 · Updated Sep 16, 2026

Out-of-bounds write in the Linux kernel BTT driver allows local users to crash the kernel via a crafted or foreign BTT arena. The driver sizes freelist and read-tracking arrays from the unvalidated on-media nfree field, then indexes them with a lane value bounded by a larger region lane count. Reaching the overwrite requires local control of BTT arena metadata and BTT I/O; the demonstrated consequence is a kernel panic.

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

Out-of-bounds write in the Linux kernel BTT driver allows local users to crash the kernel via a crafted or foreign BTT arena. The driver sizes freelist and read-tracking arrays from the unvalidated on-media nfree field, then indexes them with a lane value bounded by a larger region lane count. Reaching the overwrite requires local control of BTT arena metadata and BTT I/O; the demonstrated consequence is a kernel panic.

The record

CVE
CVE-2026-89965
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

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=4.2
  2. Affected versionversion=5212e11fde4d40fa627668b4f2222d20db488f71 <59d5cd1f42b4bab3609512c3cb3d3540d3d21da7
  3. Affected versionversion=5212e11fde4d40fa627668b4f2222d20db488f71 <6a1f2e5ed9267ca19187038ac635393c165213ac
  4. Affected versionversion=5212e11fde4d40fa627668b4f2222d20db488f71 <6b1faf1f099f7060b5f1f2f0d024132581f1726e
  5. Affected versionversion=5212e11fde4d40fa627668b4f2222d20db488f71 <6f79d1a5f2611a3d36e9312be5425cd9cb397c51
  6. Affected versionversion=5212e11fde4d40fa627668b4f2222d20db488f71 <9dfa11cef4750b67591307f2c62e47a23d60e4b7
  7. Affected versionversion=5212e11fde4d40fa627668b4f2222d20db488f71 <eb491343d2d1784121ad9af91c25b338c28913c3
  8. Affected versionversion=5212e11fde4d40fa627668b4f2222d20db488f71 <f6c5313aae794ecca8f762c1a3493de5c266f120
  9. Affected versionversion=5212e11fde4d40fa627668b4f2222d20db488f71 <f9bf05c63b77d000e9c01f3e47af36973887d350

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.2; version=5212e11fde4d40fa627668b4f2222d20db488f71 <59d5cd1f42b4bab3609512c3cb3d3540d3d21da7; version=5212e11fde4d40fa627668b4f2222d20db488f71 <6a1f2e5ed9267ca19187038ac635393c165213ac; version=5212e11fde4d40fa627668b4f2222d20db488f71 <6b1faf1f099f7060b5f1f2f0d024132581f1726e; version=5212e11fde4d40fa627668b4f2222d20db488f71 <6f79d1a5f2611a3d36e9312be5425cd9cb397c51; version=5212e11fde4d40fa627668b4f2222d20db488f71 <9dfa11cef4750b67591307f2c62e47a23d60e4b7; version=5212e11fde4d40fa627668b4f2222d20db488f71 <eb491343d2d1784121ad9af91c25b338c28913c3; version=5212e11fde4d40fa627668b4f2222d20db488f71 <f6c5313aae794ecca8f762c1a3493de5c266f120; version=5212e11fde4d40fa627668b4f2222d20db488f71 <f9bf05c63b77d000e9c01f3e47af36973887d350

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