CVE-2026-49795 in Windows
Summary
by MITRE • 07/14/2026
Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/15/2026
This vulnerability represents a critical use-after-free condition within the windows kernel that enables authenticated attackers to achieve local privilege escalation. The flaw occurs when kernel-mode code improperly handles memory management operations, specifically allowing freed memory regions to be accessed or reused before proper deallocation has completed. Such conditions typically arise from inadequate reference counting mechanisms or improper synchronization during object lifecycle management within the kernel execution context. The vulnerability manifests when an attacker with low-privilege access can manipulate kernel data structures through controlled input or system calls that ultimately lead to memory corruption.
The technical implementation of this use-after-free vulnerability involves exploitation of kernel memory management subsystems where objects are allocated and deallocated without proper safeguards against subsequent access attempts. When a kernel object is freed, its memory may still be referenced by other kernel components or user-mode applications through dangling pointers, creating opportunities for arbitrary code execution. The attacker exploits the timing window between object deallocation and actual memory reuse to inject malicious code into kernel space where it can execute with system-level privileges. This type of vulnerability falls under the common weakness enumeration category of CWE-416 use after free, which is classified as a severe memory safety issue that directly impacts system integrity.
From an operational perspective, this vulnerability creates a significant threat vector for attackers who can leverage local access to escalate their privileges from standard user accounts to system administrator level. The exploitation process typically requires the attacker to first establish a foothold on the target system through legitimate means such as phishing or credential compromise, followed by the execution of specific kernel manipulation techniques to trigger the use-after-free condition. Once successful, the attacker gains complete control over the compromised system including access to all user accounts, files, and system resources without detection. The attack surfaces are particularly dangerous because they operate at kernel level where traditional security controls such as user-mode exploit protection mechanisms become ineffective.
Mitigation strategies for this vulnerability include implementing robust kernel memory management practices such as enhanced reference counting, proper synchronization primitives, and comprehensive input validation within kernel components. Microsoft recommends applying the latest security updates and patches that address the specific use-after-free conditions in kernel memory managers. Organizations should also deploy advanced exploit prevention technologies including kernel-mode exploit protection, control flow integrity checks, and runtime application whitelisting to prevent exploitation attempts. Security monitoring solutions should be configured to detect anomalous kernel behavior patterns that may indicate exploitation attempts, while system administrators should maintain strict access controls and regularly audit system configurations to minimize attack surface exposure.
The ATT&CK framework categorizes this vulnerability under privilege escalation techniques where attackers leverage system-level weaknesses to gain higher privileges through kernel exploitation methods. This aligns with the technique T1068 which involves exploiting vulnerabilities in operating systems or applications to achieve elevated access levels. Organizations should implement comprehensive security awareness training programs to reduce initial compromise risks and maintain regular vulnerability assessment schedules to identify similar memory safety issues across their systems. The remediation process requires not only patching the specific vulnerability but also conducting thorough code reviews of kernel components to prevent similar use-after-free conditions from occurring in other parts of the system architecture.
This particular vulnerability demonstrates the critical importance of kernel security in modern operating systems where a single memory management flaw can lead to complete system compromise. The complexity of kernel-level exploitation requires sophisticated defensive measures including advanced threat hunting capabilities, regular security assessments, and continuous monitoring for signs of kernel abuse. Organizations must maintain robust incident response procedures specifically designed to handle kernel-level attacks since traditional recovery methods may be insufficient when system integrity has been compromised at the most fundamental level of operation.