CVE-2026-43022
Description
A flaw was found in the Bluetooth Host Controller Interface (HCI) synchronization component of the Linux kernel. The hci_cmd_sync_queue_once() function did not properly signal when a command was already queued, which could lead to resource leaks. An attacker could potentially exploit this to cause a Denial of Service by exhausting system resources.
Statement
A Moderate flaw was found in the Bluetooth Host Controller Interface (HCI) synchronization component of the Linux kernel. This issue could allow a local attacker to cause a Denial of Service by exhausting system resources due to improper handling of queued commands. Exploitation requires local access to the system or specific Bluetooth capabilities.
Mitigation
To mitigate this issue, disable the Bluetooth service on affected systems if it is not required. This prevents the vulnerable code path from being exercised.
To disable the Bluetooth service:
bashNote that disabling the Bluetooth service will prevent all Bluetooth functionality on the system. A system reboot may be required for the changes to take full effect.
sudo systemctl stop bluetooth
sudo systemctl disable bluetooth
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (Other); DoS: Resource Consumption (Memory); DoS: Resource Consumption (CPU)
An attacker that can influence the allocation of resources that are not properly released could deplete the available resource pool and prevent all other processes from accessing the same type of resource. Frequently-affected resources include memory, CPU, disk space, power or battery, etc.
Frequently Asked Questions
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