What is CVE-2026-12235?

CVE-2026-12235 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Out-of-bounds Write. CVSS score: 6.3/10. Published 2026-08-12.

How severe is CVE-2026-12235?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Buffer overflow in Zephyrproject Zephyr

CVE-2026-12235

The Linkable Loadable Extensions (llext) subsystem mis-handles PLT/RELA relocation entries when linking a relocatable (partially-linked) ELF extension. In llext_link_plt() (subsys/llext/llext_link.c), the relocatable branch (tgt != NULL, t…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H.

Affected products

Zephyrproject Zephyr — versions 3.7.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

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

Frequently asked questions

What is CVE-2026-12235?: CVE-2026-12235 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Out-of-bounds Write. CVSS score: 6.3/10. Published 2026-08-12.
How severe is CVE-2026-12235?: Medium severity. CVSS v3 base score is 6.3 out of 10.