CVE-2026-43694 in macOS
Summary
by MITRE • 07/28/2026
The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to cause unexpected system termination or write kernel memory.
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Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a critical memory management flaw that could enable malicious applications to trigger unexpected system termination or perform unauthorized kernel memory writes. The issue stems from insufficient memory handling mechanisms within the operating system's kernel components, creating potential attack vectors for privilege escalation and system instability. Such vulnerabilities are particularly dangerous as they can be exploited to gain elevated privileges or cause denial of service conditions that compromise overall system integrity.
The technical implementation of this flaw involves improper memory allocation and deallocation procedures within macOS kernel space operations. When applications interact with system memory management functions, the lack of proper bounds checking and memory validation allows crafted input or malicious code execution to overwrite critical kernel memory regions. This type of vulnerability aligns with common weakness patterns identified in the CWE database under category 129 which encompasses improper handling of memory resources and buffer overflows that can lead to arbitrary code execution.
From an operational impact perspective, this vulnerability creates significant security risks for macOS environments where malicious applications might exploit these memory handling deficiencies. The potential for unexpected system termination could result in data loss or service disruption, while the kernel memory write capability presents opportunities for privilege escalation attacks. Attackers could leverage this flaw to execute arbitrary code with kernel-level privileges, effectively bypassing standard user-mode protections and potentially establishing persistent backdoors within the system.
The mitigation strategy involves applying the security patches released as part of macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6 updates. These releases contain improved memory handling routines that address the specific vulnerability conditions allowing for unauthorized kernel memory access. System administrators should prioritize deployment of these patches across all affected systems, particularly in enterprise environments where the risk of exploitation is higher due to increased attack surface exposure.
Organizations should also implement additional defensive measures including monitoring for unusual system termination patterns, reviewing application behavior for suspicious memory access patterns, and maintaining updated threat intelligence regarding potential exploitation attempts. The vulnerability's classification under attack techniques such as privilege escalation and code execution within the ATT&CK framework indicates that adversaries may attempt to leverage this flaw as part of broader exploitation campaigns targeting macOS environments. Regular security assessments and memory integrity monitoring should be implemented to detect any remaining vulnerabilities or improper memory handling implementations that could provide alternative attack vectors for similar classes of exploits.