What is CVE-2026-10640?

CVE-2026-10640 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Use After Free. CVSS score: 4.2/10. Published 2026-06-16.

How severe is CVE-2026-10640?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Use After Free in Zephyrproject Zephyr

CVE-2026-10640

Zephyr's IPv6 Neighbor Discovery send paths (net_ipv6_send_na, net_ipv6_send_ns, net_ipv6_send_rs in subsys/net/ip/ipv6_nbr.c) updated the per-interface ICMP-sent statistics by calling net_pkt_iface(pkt) after net_send_data(pkt) had alread…

Vulnerability class: Use-After-Free

EPSS: 0.004 (29.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L.

Affected products

Zephyrproject Zephyr — versions 3.3.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

vulnerabilities@zephyrproject.org (Patch, patch)
vulnerabilities@zephyrproject.org (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-10640?: CVE-2026-10640 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Use After Free. CVSS score: 4.2/10. Published 2026-06-16.
How severe is CVE-2026-10640?: Medium severity. CVSS v3 base score is 4.2 out of 10.