CVE-2024-40788 is a vulnerability classified as CWE-843 (type confusion) affecting Apple iOS and iPadOS, as well as other Apple operating systems like macOS, tvOS, visionOS, and watchOS. The issue stems from improper memory handling that leads to type confusion, a condition where a program mistakenly treats a piece of memory as a different type than intended. This can cause unpredictable behavior, including system crashes or shutdowns. The vulnerability allows a local attacker—someone with physical or local access to the device—to trigger an unexpected system shutdown without requiring any privileges or user interaction. Apple has addressed this flaw in updates iOS 16.7.9, iOS 17.6, macOS Monterey 12.7.6, macOS Sonoma 14.6, macOS Ventura 13.6.8, tvOS 17.6, visionOS 1.3, and watchOS 10.6. The CVSS v3.1 score of 6.2 reflects a medium severity, primarily due to the impact on availability (system shutdown) with no impact on confidentiality or integrity. The vulnerability does not appear to be exploited in the wild yet, but the ease of causing a denial-of-service condition on widely used Apple devices makes it a concern. The flaw is particularly relevant for environments where device uptime is critical, such as enterprise, healthcare, and government sectors using Apple hardware. The vulnerability requires local access but no privileges or user interaction, which lowers the barrier for exploitation in certain scenarios such as shared or public devices.

The primary impact of CVE-2024-40788 is on system availability, as it allows a local attacker to cause unexpected shutdowns of Apple devices running vulnerable versions of iOS, iPadOS, and other Apple operating systems. This can lead to denial-of-service conditions, disrupting user productivity and potentially causing data loss if shutdowns occur during critical operations. While confidentiality and integrity are not affected, the availability impact can be significant in environments relying heavily on Apple devices for business continuity, healthcare monitoring, or critical communications. The requirement for local access limits remote exploitation but does not eliminate risk in scenarios where attackers gain physical access or compromise local user accounts. Organizations with large deployments of Apple devices may face operational disruptions and increased support costs if devices are affected. The absence of known exploits in the wild reduces immediate risk but does not preclude future exploitation attempts. Overall, the vulnerability poses a moderate threat to availability, especially in high-dependency contexts.

To mitigate CVE-2024-40788, organizations and users should promptly apply the security updates released by Apple, including iOS 16.7.9, iOS 17.6, macOS Monterey 12.7.6, macOS Sonoma 14.6, macOS Ventura 13.6.8, tvOS 17.6, visionOS 1.3, and watchOS 10.6. Beyond patching, organizations should enforce strict physical security controls to limit local access to devices, reducing the risk of exploitation. Device management solutions should be used to monitor and enforce update compliance across all Apple devices. For shared or public-use devices, consider implementing additional access controls or session timeouts to prevent unauthorized local use. Incident response plans should include procedures for handling unexpected device shutdowns to minimize operational impact. Additionally, educating users about the importance of installing updates and reporting unusual device behavior can help detect and mitigate exploitation attempts early. Regular backups and data synchronization can reduce data loss risks associated with unexpected shutdowns.