CVE-2026-43021
kernel: Bluetooth: hci_sync: fix leaks when hci_cmd_sync_queue_once fails
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · May 1, 2026
Updated · June 28, 2026
Description
A flaw was found in the Bluetooth hci_sync component of the Linux kernel. When the hci_cmd_sync_queue_once() function fails, the associated destroy callback is not invoked, leading to memory and reference leaks. This continuous leakage of resources could eventually result in a Denial of Service (DoS) condition, making the system unstable or unresponsive.
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 · 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-772 · Missing Release of Resource after Effective Lifetime