CVE-2026-28832: Apple macOS Information Disclosure Flaw

CVE-2026-28832 Overview

CVE-2026-28832 is an out-of-bounds read vulnerability affecting Apple macOS that allows a local application to disclose sensitive kernel memory. The vulnerability stems from insufficient bounds checking in kernel memory operations, which Apple has addressed with improved validation in recent security updates. This type of memory disclosure vulnerability (CWE-125) can expose sensitive kernel data structures, potentially aiding attackers in bypassing kernel-level security mechanisms such as ASLR (Address Space Layout Randomization).

Critical Impact

A malicious application running on affected macOS systems can read kernel memory contents, potentially exposing sensitive information including cryptographic keys, kernel pointers, and other privileged data that could be leveraged for further exploitation.

Affected Products

• macOS Sequoia versions prior to 15.7.5
• macOS Sonoma versions prior to 14.8.5
• macOS Tahoe versions prior to 26.4

Discovery Timeline

• 2026-03-25 - CVE-2026-28832 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-28832

Vulnerability Analysis

This out-of-bounds read vulnerability occurs when the macOS kernel fails to properly validate buffer boundaries before performing memory read operations. When an application makes specific system calls or interacts with certain kernel interfaces, the kernel may read data beyond the intended buffer boundaries, exposing adjacent kernel memory contents to the requesting application.

The vulnerability requires local access and can be triggered by a malicious application installed on the target system. Once exploited, the attacker can systematically leak kernel memory, potentially revealing kernel address space layout information that defeats ASLR protections, or sensitive data stored in kernel memory such as credentials, encryption keys, or internal kernel state information.

Root Cause

The root cause is insufficient bounds checking in kernel memory access routines. The affected code paths fail to validate that memory read operations stay within allocated buffer boundaries. This is classified as CWE-125 (Out-of-bounds Read), a common class of memory safety vulnerability. Apple addressed this by implementing improved bounds checking to ensure all memory read operations are properly constrained to their intended buffer limits.

Attack Vector

The attack requires local access to the target macOS system. An attacker must be able to execute code on the system, typically through installing a malicious application or exploiting another vulnerability to gain initial code execution. Once the attacker has local code execution capability, they can craft specific inputs to trigger the out-of-bounds read condition.

The attacker's application would interact with vulnerable kernel interfaces, passing carefully crafted parameters that cause the kernel to read beyond buffer boundaries. The disclosed kernel memory is then returned to the application, allowing the attacker to analyze sensitive kernel data structures and potentially chain this information disclosure with other vulnerabilities for privilege escalation or security bypass attacks.

Detection Methods for CVE-2026-28832

Indicators of Compromise

• Unusual kernel panic logs or crash reports referencing memory access violations
• Applications making excessive or anomalous system calls to kernel interfaces
• Unexpected memory access patterns detected by endpoint security monitoring
• Presence of unfamiliar applications that were not installed through official channels

Detection Strategies

• Monitor for applications attempting to read large amounts of kernel memory through system call monitoring
• Implement endpoint detection rules for suspicious memory access patterns associated with kernel memory disclosure
• Use behavioral analysis to identify applications making unusual kernel interface calls
• Deploy kernel integrity monitoring to detect exploitation attempts

Monitoring Recommendations

• Enable system call auditing for sensitive kernel operations on macOS systems
• Configure endpoint security tools to alert on kernel memory access anomalies
• Review system logs for any crash reports or kernel panics related to memory access
• Monitor for installation of unsigned or untrusted applications

How to Mitigate CVE-2026-28832

Immediate Actions Required

• Update all affected macOS systems to the patched versions immediately
• Review installed applications and remove any untrusted or unfamiliar software
• Enforce application signing requirements using Gatekeeper
• Restrict user privileges to limit installation of potentially malicious applications

Patch Information

Apple has released security updates to address CVE-2026-28832 with improved bounds checking. Organizations should apply the following updates:

• macOS Sequoia: Update to version 15.7.5 or later - See Apple Security Advisory 126794
• macOS Sonoma: Update to version 14.8.5 or later - See Apple Security Advisory 126795
• macOS Tahoe: Update to version 26.4 or later - See Apple Security Advisory 126796

Updates can be applied through System Settings > Software Update or via MDM solutions for enterprise deployments.

Workarounds

• Restrict application installation to only signed applications from the App Store or identified developers
• Implement application allowlisting to prevent execution of unauthorized software
• Use endpoint security solutions with kernel-level protection capabilities
• Isolate sensitive workloads on patched systems while updates are deployed to remaining fleet

# Verify macOS version and check for available updates
sw_vers -productVersion
softwareupdate --list

# Apply available security updates
softwareupdate --install --all

# Enable Gatekeeper to restrict application sources
sudo spctl --master-enable