CVE-2022-26758 macOS Memory Corruption Vulnerability: Patches & Detection

Technical summary

This vulnerability stems from a race condition (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization) in interprocess communication mechanisms on macOS. A locally-running application can exploit inadequate synchronization of shared memory to cause memory corruption. The attacker gains the ability to read confidential information and modify the integrity of data accessible to other processes, but cannot directly cause denial of service. Exploitation requires local code execution privileges and no user interaction.

Business impact

Organizations relying on macOS for critical workloads face a moderate but tangible risk from this vulnerability. A compromised third-party application or a malicious insider with local access could exfiltrate sensitive data (credentials, documents, intellectual property) or manipulate system state to establish persistence. Multi-user shared systems and development environments are particularly exposed. The impact is amplified in organizations that run untrusted or less-vetted applications alongside sensitive workflows.

Affected systems

Apple macOS Monterey versions prior to 12.4 are affected. Determine your current macOS version via System Preferences > General > About This Mac. Any organization still operating pre-12.4 Monterey systems requires urgent assessment and patching.

Exploitability

This is not listed on the CISA Known Exploited Vulnerabilities catalog, suggesting no widespread active exploitation in the wild as of the last update. However, the attack vector is local, access control requirements are low (any user on the system), and no user interaction is needed—characteristics that make this attractive for targeted post-compromise attacks or supply-chain scenarios. An attacker must already have code execution on the target system; this is not remotely exploitable.

Remediation

Update macOS Monterey to version 12.4 or later. Verify the patch by navigating to System Preferences > General > About This Mac and confirming the system version displays 12.4 or higher. Organizations should prioritize this update for systems handling sensitive data or running applications from untrusted sources.

Patch guidance

Apple released the fix in macOS Monterey 12.4. Administrators should enable automatic updates or manually install the patch through System Preferences > General > Software Update. Test the update in a non-production environment first, particularly for systems running legacy applications. Consider a phased rollout prioritizing high-value systems (development servers, data repositories, administrative workstations) before general deployment.

Detection guidance

Monitor system logs for unexpected interprocess memory access patterns or crashes related to shared memory regions using tools such as Activity Monitor, Console.app, and system audit logs. Organizations using endpoint detection and response (EDR) solutions should configure alerts for anomalous memory corruption attempts or unauthorized shared memory manipulation. Memory dumps of suspicious processes may reveal evidence of exploitation, though proving post-exploit causation is challenging.

Why prioritize this

This receives a HIGH severity rating due to the combination of confidentiality and integrity impact to sensitive process memory. Local-only access and existing user privileges do moderate the risk compared to remote execution vulnerabilities, but the simplicity of the attack vector and the sensitivity of shared memory in multi-application environments justify prioritization for patching within 30 days. Organizations running development systems, multi-tenant infrastructure, or environments where untrusted applications run alongside sensitive services should treat this as urgent.

Risk score, explained

The CVSS 3.1 score of 7.1 (HIGH) reflects high impact on confidentiality and integrity of memory regions, locally exploitable without escalation or user interaction, but scoped to the privileges of the attacking process and without denial of service. The race condition nature (CWE-362) introduces some difficulty in reliable exploitation but does not eliminate the risk. Organizations should not downgrade urgency based on the absence from KEV; local memory corruption vulnerabilities are commonly exploited post-breach or in supply-chain attacks that may not yet be publicly reported.

Frequently asked questions