Windows Server 2012 CVE-2026-26182

Local authenticated user account required; Windows Ancillary Function Driver for WinSock enabled (default in most Windows installations); specific sequence of Winsock function calls must be performed to trigger memory management race condition

Real-world risk is moderate despite CVSS 7.0 scoring. The CVSS vector reveals significant exploitation barriers: local access required (AV:L), high attack complexity (AC:H), and low-privilege authentication needed (PR:L). High complexity suggests precise timing or race condition manipulation required, limiting opportunistic exploitation. No CISA KEV listing indicates no confirmed active exploitation campaigns. No public exploit identified at time of analysis, though use-after-free vulnerabilities in Windows kernel drivers historically attract sophisticated threat actors once exploitation techniques mature. The broad affected surface (all Windows versions since 2012) creates substantial organizational exposure, but the local attack vector limits remote threat scenarios. Vendor patches available across all platforms significantly reduces risk for organizations with active patch management. This represents a priority for servers and workstations where local user access is granted to potentially untrusted users, particularly multi-user systems, jump boxes, and virtualization hosts where initial foothold enables lateral movement.

An attacker with low-privilege user credentials on a Windows system executes specially crafted code that triggers socket operations through the WinSock API. By carefully timing socket closure and I/O requests to induce race conditions, the attacker forces the AFD.sys driver to access previously freed memory. Through heap manipulation techniques, the attacker controls the contents of the freed memory region, allowing kernel-mode code execution with SYSTEM privileges. Post-exploitation, the attacker installs persistence mechanisms, accesses sensitive