CVE-2026-98109

Kernel warning via uninitialized Bluetooth mutex

Published Sep 25, 2026 · Updated Sep 25, 2026

Race condition in the Linux Bluetooth HCI core allows attackers to trigger a kernel lock-debugging warning during device registration. hci_register_dev queues power_on before adv_monitors_idr and the MSFT extension are initialized, while msft_register exposes msft_data before initializing filter_lock. A device with HCI_QUIRK_RAW_DEVICE can let hci_power_on call msft_do_close concurrently, causing mutex_lock to use the uninitialized mutex; only the warning is confirmed.

CVSS severityUnavailable
Unscored
EPSS probability0.09%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Race condition in the Linux Bluetooth HCI core allows attackers to trigger a kernel lock-debugging warning during device registration. hci_register_dev queues power_on before adv_monitors_idr and the MSFT extension are initialized, while msft_register exposes msft_data before initializing filter_lock. A device with HCI_QUIRK_RAW_DEVICE can let hci_power_on call msft_do_close concurrently, causing mutex_lock to use the uninitialized mutex; only the warning is confirmed.

The record

CVE
CVE-2026-98109
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.4.16 <6.5
  2. Affected versionversion=6.5.3 <6.6
  3. Affected versionversion=6.6
  4. Affected versionversion=80fe27811c56ecd3896c3d511ab8298146071d98
  5. Affected versionversion=9e14606d8f38ea52a38c27692a9c1513c987a5da <57938bbdb9bf7fd41cbd5cd509ec10c4b22bec18
  6. Affected versionversion=9e14606d8f38ea52a38c27692a9c1513c987a5da <a11ebe8dc0333fb870bbbb656b34690e87ee3f98
  7. Affected versionversion=9e14606d8f38ea52a38c27692a9c1513c987a5da <b1faf348c29e6f8302ec7769cbf1c1ef05be014f
  8. Affected versionversion=9e14606d8f38ea52a38c27692a9c1513c987a5da <d427b1c71d9798083e954d3c13469dc0a2305868
  9. Affected versionversion=f9965f7f38c90449a5fb26edb8a7d22b1dcf0283

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.4.16 <6.5; version=6.5.3 <6.6; version=6.6; version=80fe27811c56ecd3896c3d511ab8298146071d98; version=9e14606d8f38ea52a38c27692a9c1513c987a5da <57938bbdb9bf7fd41cbd5cd509ec10c4b22bec18; version=9e14606d8f38ea52a38c27692a9c1513c987a5da <a11ebe8dc0333fb870bbbb656b34690e87ee3f98; version=9e14606d8f38ea52a38c27692a9c1513c987a5da <b1faf348c29e6f8302ec7769cbf1c1ef05be014f; version=9e14606d8f38ea52a38c27692a9c1513c987a5da <d427b1c71d9798083e954d3c13469dc0a2305868; version=f9965f7f38c90449a5fb26edb8a7d22b1dcf0283

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
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

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started