What is CVE-2026-10653?

CVE-2026-10653 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Double Free. CVSS score: 6.4/10. Published 2026-06-30.

How severe is CVE-2026-10653?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Double Free in Zephyrproject Zephyr

CVE-2026-10653

The Zephyr net_buf library (lib/net_buf/buf.c) manipulated both of its reference counts -- the per-header buf->ref and the per-data-block ref_count at the start of each variable/heap data allocation -- with plain non-atomic C operators (bu…

Vulnerability class: Double Free

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H.

Affected products

Zephyrproject Zephyr — versions 2.7.0

Weakness classification (CWE)

CWE-415 — Double Free

References

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

Frequently asked questions

What is CVE-2026-10653?: CVE-2026-10653 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Double Free. CVSS score: 6.4/10. Published 2026-06-30.
How severe is CVE-2026-10653?: Medium severity. CVSS v3 base score is 6.4 out of 10.