CVE-2026-64697: Apple macOS Buffer Overflow Vulnerability

CVE-2026-64697 Overview

CVE-2026-64697 is a memory corruption vulnerability affecting multiple versions of Apple macOS. A malicious application can trigger unexpected system termination or corrupt kernel memory. Apple addressed the flaw with improved memory handling in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. The weakness maps to [CWE-119] (Improper Restriction of Operations within the Bounds of a Memory Buffer). Successful exploitation compromises kernel integrity, opening a path to arbitrary code execution at the highest privilege level on affected Macs.

Critical Impact
An app running on an unpatched macOS system can corrupt kernel memory or force a system crash, undermining confidentiality, integrity, and availability of the host.

Affected Products

Apple macOS Sequoia (versions prior to 15.7.8)
Apple macOS Sonoma (versions prior to 14.8.8)
Apple macOS Tahoe (versions prior to 26.6)

Discovery Timeline

2026-07-27 - CVE-2026-64697 published to NVD
2026-07-28 - Last updated in NVD database

Technical Details for CVE-2026-64697

Vulnerability Analysis

CVE-2026-64697 is a kernel memory corruption issue in macOS. Apple's advisory states that an application can cause unexpected system termination or corrupt kernel memory. The root category [CWE-119] indicates that an operation reads or writes outside the bounds of an allocated buffer within kernel-managed memory. Apple resolved the flaw through improved memory handling, indicating that boundary checks or lifetime tracking were refined in the affected component.

Kernel memory corruption vulnerabilities of this class typically enable local privilege escalation. An attacker who can execute an unprivileged application on the target Mac can trigger the flaw and either crash the kernel or manipulate adjacent kernel structures. Successful manipulation of kernel data can bypass sandbox restrictions, disable protections, or install persistent implants.

Root Cause

Apple has not published the vulnerable component or code path. The advisory attributes the issue to memory handling that failed to enforce buffer boundaries or object lifetimes correctly, consistent with [CWE-119]. The fix introduces stricter validation before memory operations reach kernel structures.

Attack Vector

The NVD entry lists a network-based attack vector, but Apple's description scopes exploitation to a local application on the affected host. In practice, an attacker delivers a malicious binary through phishing, a compromised installer, or a supply-chain package. Once executed, the app performs the operation that triggers kernel memory corruption. No user interaction beyond running the app is required.

No public proof-of-concept, exploit code, or in-the-wild exploitation has been reported. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-64697

Indicators of Compromise

Unexpected macOS kernel panics or spontaneous reboots correlated with a specific application launch.
New or unsigned binaries executing from user-writable paths such as ~/Downloads, /tmp, or /private/var/folders.
Unified log entries referencing kernel memory faults, EXC_BAD_ACCESS in kernel context, or panic reports under /Library/Logs/DiagnosticReports/.

Detection Strategies

Inventory macOS endpoints and flag any system running a build older than 15.7.8, 14.8.8, or 26.6.
Hunt for processes making unusual IOKit, Mach, or syscall patterns that precede panic events.
Correlate crash reports across the fleet to identify a common triggering binary or bundle identifier.

Monitoring Recommendations

Forward macOS unified logs, spindump, and panic reports to a central SIEM for cross-host correlation.
Alert on repeated kernel panics originating from the same user, host, or parent process.
Track execution of newly signed or ad-hoc-signed applications launched shortly before crash events.

How to Mitigate CVE-2026-64697

Immediate Actions Required

Apply the Apple security update to macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, or macOS Tahoe 26.6 on all managed Macs.
Prioritize patching on developer workstations, administrator endpoints, and shared research systems where untrusted code is more likely to run.
Verify patch deployment through MDM compliance reporting and reboot enforcement.

Patch Information

Apple published fixes in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. Refer to the vendor advisories: Apple Support Article #128067, Apple Support Article #128071, and Apple Support Article #128072.

Workarounds

Restrict execution of untrusted applications using Gatekeeper, notarization enforcement, and MDM allowlists until patching completes.
Enforce standard user accounts and remove local administrator rights to limit which binaries can be introduced onto the endpoint.
Use application control to block execution from user-writable directories such as ~/Downloads and /tmp.

bash

# Verify current macOS build and confirm patch level
sw_vers
softwareupdate --list
sudo softwareupdate --install --all --restart