CVE-2026-43021

Bluetooth: hci_sync: fix leaks when hci_cmd_sync_queue_once fails

CVE-2026-43021 is fixed in linux on 1 platform by DEBIAN-CVE-2026-43021 (version 6.19.12-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.5

medium

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0011

1st percentile

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: fix leaks when hci_cmd_sync_queue_once fails When hci_cmd_sync_queue_once() returns with error, the destroy callback will not be called. Fix leaking references / memory on these failures.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
linux · Debian 14	6.19.12-1	DEBIAN-CVE-2026-43021	May 15, 2026

Details

Published
May 1, 2026
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43021

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