What is CVE-2026-10638?

CVE-2026-10638 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Use After Free. CVSS score: 5.9/10. Published 2026-06-16.

How severe is CVE-2026-10638?

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

Use After Free in Zephyrproject Zephyr

CVE-2026-10638

subsys/net/ip/icmpv6.c reads the network interface from a net_pkt after that packet has been handed to net_try_send_data(). In icmpv6_handle_echo_request() and net_icmpv6_send_error(), the post-send statistics update calls net_pkt_iface(re…

Vulnerability class: Use-After-Free

CVSS v3 metric

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

Affected products

Zephyrproject Zephyr — versions 4.2.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2026-10638?: CVE-2026-10638 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Use After Free. CVSS score: 5.9/10. Published 2026-06-16.
How severe is CVE-2026-10638?: Medium severity. CVSS v3 base score is 5.9 out of 10.