CVE-2026-89809Hinoki check available

Kernel crash via uninitialized mqd manager dereference

Published Sep 16, 2026 · Updated Sep 16, 2026

NULL pointer dereference in Linux before 7.2.5 allows local users to crash the kernel by reading the KFD mqds debugfs file. In pqm_debugfs_mqds, a loop calls mqd_mgr->debugfs_show_mqd after a queue entry with a null pqn->q skips initialization of mqd_mgr. Reachability requires permission to read debugfs, an active KFD queue, and a kernel-queue entry; debugfs is root-only by default.

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

NULL pointer dereference in Linux before 7.2.5 allows local users to crash the kernel by reading the KFD mqds debugfs file. In pqm_debugfs_mqds, a loop calls mqd_mgr->debugfs_show_mqd after a queue entry with a null pqn->q skips initialization of mqd_mgr. Reachability requires permission to read debugfs, an active KFD queue, and a kernel-queue entry; debugfs is root-only by default.

The record

CVE
CVE-2026-89809
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
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?

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  1. Affected versionversion=0 <7.2.5
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <012a026bae0212952b423a842b7e2c0bf21f8e7a
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <58e866711b234571b0ce342c43d153a4786b32b8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=0 <7.2.5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <012a026bae0212952b423a842b7e2c0bf21f8e7a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <58e866711b234571b0ce342c43d153a4786b32b8

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

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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