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CVE-2026-12366 is a high-severity use-after-free vulnerability in Zephyr's dynamic kernel-object disposal logic affecting dynamically allocated timer objects. In the unref_check() path in kernel/userspace/userspace.c, object storage is freed after the reference count reaches zero, but the cleanup logic handled message queues and stacks without performing equivalent cleanup for K_OBJ_TIMER. As a result, a dynamically allocated, initialized, and armed k_timer can be freed while its embedded timeout node remains linked in the global timeout queue. When the timer later expires, the timeout subsystem traverses the queue and invokes the timer expiration handler on the freed node, causing dereference and write operations against freed and potentially reallocated kernel heap memory in kernel/ISR context. The condition is deterministic because the queued timeout node is not unlinked before the timer storage is released.
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Cross-references every affected SKU, including bundled OEM variants.
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