What is CVE-2026-11893?

CVE-2026-11893 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Double Free. CVSS score: 5.9/10. Published 2026-08-11.

How severe is CVE-2026-11893?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Double Free in Zephyrproject Zephyr

CVE-2026-11893

The Bluetooth HCI driver for Bouffalo Lab on-chip BLE controllers (BL60x/BL70x/BL61x), bt_bflb_send() in drivers/bluetooth/hci/hci_bflb.c, violates the bt_hci_driver_api.send() buffer-ownership contract. That contract (documented at includ…

Vulnerability class: Double Free

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.

Affected products

Zephyrproject Zephyr — versions 4.4.0

Weakness classification (CWE)

CWE-415 — Double Free

References

vulnerabilities@zephyrproject.org (patch)
vulnerabilities@zephyrproject.org

Frequently asked questions

What is CVE-2026-11893?: CVE-2026-11893 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Double Free. CVSS score: 5.9/10. Published 2026-08-11.
How severe is CVE-2026-11893?: Medium severity. CVSS v3 base score is 5.9 out of 10.