CVE-2026-64776 in macOS
Summary
by MITRE • 07/28/2026
The issue was addressed with improved bounds checks. 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 disclose kernel memory.
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Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a critical kernel memory disclosure issue that arises from insufficient bounds checking mechanisms within the operating system kernel. The flaw allows malicious applications to potentially access and disclose sensitive kernel memory contents through improper validation of memory access boundaries. Such vulnerabilities typically stem from inadequate input sanitization or buffer overflow protection mechanisms that should prevent unauthorized memory access patterns. The vulnerability exists across multiple macOS versions including Sequoia 14.7.8, Sonoma 14.8.8, and Tahoe 26.6, indicating a widespread impact across the macOS ecosystem. The root cause aligns with common software security weaknesses documented in CWE-129, which addresses insufficient bounds checking on array data access, and CWE-130, concerning improper handling of length parameters in memory operations.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable more sophisticated attacks that could leverage kernel memory contents for privilege escalation or system compromise. Attackers could exploit the memory disclosure to gather sensitive information about kernel structures, memory layouts, or security-related data that might aid in developing further exploits. This type of vulnerability falls under the ATT&CK technique T1068 which covers exploitation of system privileges and T1547 which addresses privilege escalation through kernel-level attacks. The memory disclosure capability could provide adversaries with insights into kernel memory organization, potentially revealing stack canaries, heap metadata, or other security mechanisms that would otherwise remain hidden from user-space applications.
The fix implemented by Apple involves enhanced bounds checking mechanisms that properly validate memory access operations and prevent unauthorized kernel memory access patterns. These improvements align with the principle of least privilege and defense in depth strategies recommended in cybersecurity frameworks such as NIST SP 800-53. The patch addresses both immediate memory disclosure risks and helps prevent potential exploitation pathways that could lead to broader system compromise. Organizations should prioritize deployment of these updates across all affected macOS versions to mitigate the risk of kernel memory exposure. The remediation approach demonstrates proper vulnerability management practices, including the identification of specific security weaknesses, implementation of targeted fixes, and comprehensive testing to ensure both security and system stability are maintained. This vulnerability highlights the critical importance of robust memory safety mechanisms in operating system kernels where improper bounds checking can create fundamental security weaknesses that affect the entire system integrity.