What is CVE-2026-10681?

CVE-2026-10681 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.5/10. Published 2026-07-25.

How severe is CVE-2026-10681?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Zephyrproject Zephyr

CVE-2026-10681

In Zephyr's userspace dynamic-objects subsystem, thread_idx_alloc() in kernel/userspace/userspace.c allocated a new thread permission index from the global _thread_idx_map[] bitmap without holding lists_lock. On SMP systems, two user-mode…

Vulnerability class: Race Condition

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L.

Affected products

Zephyrproject Zephyr — versions 2.0.0

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

Frequently asked questions

What is CVE-2026-10681?: CVE-2026-10681 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.5/10. Published 2026-07-25.
How severe is CVE-2026-10681?: Medium severity. CVSS v3 base score is 6.5 out of 10.