A high-severity use-after-free vulnerability in the Zephyr RTOS kernel could allow a local authenticated attacker to achieve total system compromise.

The flaw (CWE-416) resides in the dynamic kernel-object disposal path of the Zephyr kernel. An attacker with low-level local privileges can trigger this use-after-free condition to gain unauthorized control over kernel memory structures.

With a CVSS score of 8.8, this vulnerability poses a severe threat to systems utilizing the Zephyr RTOS. Exploitation could lead to arbitrary code execution within the kernel, resulting in total system failure, data corruption, or the bypass of security boundaries designed to protect the runtime environment.

Immediate Action: Update the Zephyr RTOS environment to version 4.5.0 or later, which contains the necessary security patches for the kernel disposal logic.

Proactive Monitoring: Audit local access permissions and monitor for kernel-level crashes or unexpected reboots that may indicate exploitation attempts against the kernel memory management system.

Compensating Controls: Restrict local access to the device and ensure that userspace applications are strictly sandboxed, limiting the ability of low-privileged processes to interact with sensitive kernel-object functions.

Public Exploit Available: Unknown.

Given the potential for complete system control, the security update for the Zephyr kernel should be applied as part of the next scheduled maintenance window. Ensuring that the RTOS is running the latest patched version is essential for maintaining device security in embedded and IoT deployments.