Race Condition Affecting zephyrproject-rtos/zephyr package, versions [2.0.0,4.4.2-rc1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published25 Jul 2026
- disclosed25 Jul 2026
- creditUnknown
Introduced: 25 Jul 2026
CVE-2026-10681 (opens in a new tab)How to fix?
Upgrade zephyrproject-rtos/zephyr to version 4.4.2-rc1 or higher.
Overview
Affected versions of this package are vulnerable to Race Condition via a race condition in the thread_idx_alloc function. An attacker can cause two user-mode threads to be assigned the same thread permission index by concurrently invoking the k_object_alloc syscall, resulting in shared kernel-object permission slots and bypassing userspace access control. This is only exploitable if CONFIG_USERSPACE, CONFIG_DYNAMIC_OBJECTS, and CONFIG_SMP are enabled.