CVE-2026-62749 in Windows
Summary
by MITRE • 08/11/2026
Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a critical use-after-free condition within the windows kernel that enables authenticated local attackers to escalate their privileges from standard user level to system level access. The flaw occurs when kernel-mode components fail to properly validate memory management operations, specifically during object deallocation and subsequent reuse scenarios. When an attacker can manipulate the timing or conditions under which kernel objects are freed and then accessed again, they can potentially execute arbitrary code with elevated privileges.
The technical implementation of this vulnerability typically involves exploiting race conditions or improper reference counting mechanisms within kernel data structures. Attackers leverage their authorized access to the system to trigger specific kernel operations that result in memory objects being freed while still referenced by other components. This creates opportunities for memory corruption that can be exploited through carefully crafted payloads. The vulnerability aligns with CWE-416 which describes use-after-free conditions, and specifically relates to kernel-mode memory management flaws that are particularly dangerous due to the elevated privileges required for exploitation.
From an operational perspective, this vulnerability represents a significant threat vector because it requires only local authentication to exploit, meaning any user with legitimate access to the system can potentially leverage this flaw. The attack surface is broad since kernel-level vulnerabilities can be triggered through various legitimate system functions and APIs. Attackers typically utilize techniques such as heap spraying or precise memory manipulation to ensure successful exploitation and privilege escalation. The impact extends beyond simple local privilege escalation as compromised systems can serve as launch points for broader network attacks.
Mitigation strategies focus on both immediate remediation and long-term architectural improvements. Microsoft recommends applying security updates promptly, as these vulnerabilities are typically addressed through kernel patches that fix the underlying memory management flaws. System administrators should implement additional security controls including disabling unnecessary services, enforcing least privilege principles, and monitoring for anomalous kernel behavior. The vulnerability demonstrates the importance of robust memory safety practices in kernel development and aligns with ATT&CK tactics such as privilege escalation and defense evasion. Organizations must also consider implementing runtime protections like exploit prevention technologies and regular security assessments to identify similar vulnerabilities in their systems.