A high-severity buffer overflow in Apple macOS allows remote attackers to trigger kernel memory corruption via a malicious afpfs server connection.

This vulnerability is caused by a buffer overflow in the Apple File Protocol file system (afpfs) driver. An unauthenticated attacker can trigger this flaw by enticing a user to connect to a malicious AFP server, potentially leading to arbitrary code execution within the kernel context.

Successful exploitation of this vulnerability poses a significant risk to organizational assets. Because the flaw allows for kernel memory corruption, an attacker could achieve full system compromise, bypass security controls, and gain persistent access to sensitive data. Given the CVSS score of 8.8, this issue is considered high severity and requires immediate attention to prevent potential system-wide instability or data exfiltration.

Immediate Action: Update affected macOS systems to version 15.7.8, 14.8.8, or 26.6 respectively to apply the necessary bounds checking improvements.

Proactive Monitoring: Monitor network egress traffic for unusual connection attempts to AFP services on non-standard or untrusted remote hosts.

Compensating Controls: Restrict access to untrusted network file shares and ensure that macOS firewall settings are configured to block unauthorized incoming or outgoing connections.

Public Exploit Available: No

The risk posed by kernel-level memory corruption cannot be overstated, as it typically provides an attacker with complete control over the affected hardware. Organizations should prioritize patching these specific macOS versions across their fleet immediately. Delaying these updates leaves endpoints vulnerable to exploitation should an attacker successfully lure a user into connecting to a malicious file server.