CVE-2026-98809

kernel: Bluetooth: hci_sync: don't drain cmd_sync backlog on unregister

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Severity

Moderate

Red Hat Product Security

4.4

CVSS 3.1

Review impact separately from score.

Published · October 18, 2026

Updated · October 24, 2026

Description

A flaw was found in the Linux kernel's Bluetooth subsystem. When unregistering a Bluetooth device, pending synchronous commands are processed without reaching the controller, causing each queued request to wait for a full timeout. A local user can exploit this issue by queuing an unbounded number of commands, leading to prolonged task hangs and causing a Denial of Service (DoS).

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 4.4
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CWE-770 · Allocation of Resources Without Limits or Throttling