CVE-2025-43374 is a kernel-level vulnerability in Apple operating systems including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. The vulnerability is caused by an out-of-bounds read due to inadequate bounds checking in kernel memory access routines. An attacker who is physically near the target device can exploit this flaw without requiring any privileges or user interaction. The out-of-bounds read could allow the attacker to access sensitive kernel memory, potentially leading to information disclosure or causing system instability and crashes. Apple has released patches in iOS 18.5, iPadOS 18.5, macOS Sequoia 15.5, and other OS versions to address this issue by improving bounds checking. The vulnerability is classified under CWE-121 (Stack-based Buffer Overflow), indicating a memory safety issue. Although no exploits have been reported in the wild, the kernel-level nature of the flaw means it could be leveraged as a stepping stone for more severe attacks if combined with other vulnerabilities. The requirement for physical proximity limits remote exploitation but does not eliminate risk in environments where attackers can access devices directly.

The vulnerability allows an attacker with physical proximity to perform an out-of-bounds read in kernel memory, which can lead to unauthorized disclosure of sensitive information stored in kernel space. This compromises confidentiality and may also affect system integrity and availability by causing kernel crashes or unpredictable behavior. For organizations, this could mean exposure of sensitive data, disruption of critical services, and potential escalation paths for further attacks. The impact is particularly significant for high-value targets using Apple devices in environments where physical access controls are weak, such as public spaces, conferences, or workplaces with shared devices. Although the CVSS score is medium, the kernel-level access elevates the risk beyond typical user-space vulnerabilities. The lack of required privileges or user interaction lowers the barrier for exploitation, increasing the threat in scenarios where attackers can get close to devices.

1. Apply the latest security updates from Apple immediately, including iOS 18.5, iPadOS 18.5, macOS Sequoia 15.5, and corresponding patches for other affected OS versions. 2. Enforce strict physical security controls to prevent unauthorized individuals from gaining proximity to devices, especially in sensitive environments. 3. Implement device management policies that restrict device usage in untrusted locations and monitor for unusual physical access patterns. 4. Use hardware-based security features such as Secure Enclave and enable full disk encryption to limit the impact of kernel memory disclosures. 5. Educate users about the risks of leaving devices unattended and encourage the use of strong authentication mechanisms to reduce the window of opportunity for attackers. 6. Monitor system logs and behavior for signs of kernel instability or crashes that could indicate attempted exploitation. 7. For organizations with high security requirements, consider additional endpoint detection and response (EDR) solutions capable of detecting anomalous kernel-level activities.