CVE-2026-97806 in Windows
Summary
by MITRE • 10/15/2026
Use after free in Windows Broadcast DVR User Service allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability identified as a use-after-free condition within the Windows Broadcast DVR User Service represents a critical memory management flaw that can be leveraged by authenticated attackers to achieve local privilege escalation. This specific service, which is responsible for handling digital video recording and broadcasting functionalities on affected versions of Microsoft Windows, contains code paths where pointers to dynamically allocated memory objects are not properly invalidated after those objects have been freed. In the context of C++ or similar low-level programming languages often used in system services, this oversight creates a window of opportunity during which the application may continue to reference the now-deallocated memory region. If an attacker can control the timing and content of subsequent allocations that reuse this specific memory address, they can manipulate the data stored there, effectively gaining arbitrary read or write capabilities within the context of the service process.
From a technical perspective, use-after-free vulnerabilities are particularly dangerous because they allow for precise control over program execution flow when combined with heap spraying techniques or targeted allocation strategies. The Broadcast DVR User Service typically runs with elevated privileges to manage hardware resources and system-level recording tasks. When an attacker exploits this memory corruption flaw, they can overwrite function pointers, virtual table entries, or other critical data structures residing in the freed memory block. By carefully crafting malicious input that triggers the free operation followed by a subsequent allocation of controlled content into the same memory location, the attacker can redirect execution to shellcode injected into the process heap. This mechanism bypasses many standard security mitigations because it operates within the legitimate address space and privilege context of an already-running system service, making detection significantly more challenging for endpoint protection solutions that rely on behavioral anomalies outside of normal service operations.
The operational impact of this vulnerability is severe due to its potential for local privilege escalation. An authorized attacker who has valid credentials on the target Windows machine can exploit this flaw to execute arbitrary code with the security context of the Broadcast DVR User Service, which often possesses SYSTEM-level or high-privilege administrative rights depending on the specific configuration and version of Windows. This effectively allows the attacker to bypass user account control mechanisms and gain full control over the operating system. Once elevated privileges are obtained, the attacker can install persistent backdoors, dump sensitive credentials from memory using tools like Mimikatz, modify security policies, disable logging mechanisms, or pivot to other systems on the network. The existence of this vulnerability undermines the fundamental trust model of Windows authentication and access controls, as local administrative boundaries become permeable through a single service flaw rather than requiring complex multi-stage attacks involving kernel exploits or driver vulnerabilities.
Mitigation strategies for this vulnerability primarily involve applying the security updates provided by Microsoft that address the memory management logic within the Broadcast DVR User Service. Organizations should prioritize patching affected systems to ensure that the pointer invalidation and lifecycle management code paths are corrected, thereby preventing the use of freed memory blocks. In environments where immediate patching is not feasible due to operational constraints or compatibility concerns, administrators can consider disabling the Windows Broadcast DVR User service if its functionality is not required for business operations. Disabling the service removes the attack surface associated with this specific component and prevents unauthorized processes from interacting with it. Additionally, implementing strict application whitelisting policies and monitoring for unusual memory allocation patterns in system services can provide an additional layer of defense against exploitation attempts. Regular vulnerability scanning focused on unpatched systems is also essential to identify instances where this flaw remains exploitable before attackers can leverage it for broader network compromise.
This type of vulnerability aligns with Common Weakness Enumeration identifier CWE-416, which describes use after free errors resulting from improper memory management practices. In terms of the MITRE ATT&CK framework, exploitation of this flaw falls under techniques related to privilege escalation and process injection, specifically leveraging legitimate system processes to maintain persistence or escalate privileges without triggering immediate alarms associated with unauthorized software execution. Understanding these mappings helps security teams prioritize remediation efforts based on both technical severity and strategic risk to organizational infrastructure.