CVE-2026-97809 in Windows
Summary
by MITRE • 10/14/2026
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 • 10/14/2026
The vulnerability identified involves a use-after-free error within the Windows Broadcast DVR User Service, a component responsible for managing digital video recording and broadcast-related functionalities on affected Microsoft Windows operating systems. This specific flaw arises from improper memory management practices where the service fails to properly nullify pointers after freeing allocated memory blocks or allows access to memory that has already been deallocated by other parts of the system. In such scenarios, if an attacker can trigger a sequence of operations that leads to this state, they may gain control over how the freed memory is subsequently utilized. This type of defect is classically categorized under CWE-416, which denotes Use After Free vulnerabilities, and represents one of the most prevalent classes of bugs leading to arbitrary code execution in modern software ecosystems due to their potential for precise heap manipulation.
From an operational perspective, this vulnerability poses a significant risk because it resides within a system service that typically runs with elevated privileges or interacts closely with core operating system components. Although the initial description notes that an authorized attacker is required, meaning local access and valid credentials are prerequisites, the ability to exploit a use-after-free condition in such a privileged context allows for privilege escalation. An attacker who successfully exploits this flaw can execute arbitrary code within the security context of the service or potentially higher-privileged accounts depending on how the memory corruption affects control flow structures like function pointers or virtual table entries. This aligns with MITRE ATT&CK technique T1068, which covers Exploitation for Privilege Escalation, specifically through exploitation of binary vulnerabilities to gain elevated access rights that were not previously available to the attacker account.
The technical mechanics of this exploit likely involve crafting a specific heap state where the freed memory chunk is reallocated by another process or thread with attacker-controlled data. By carefully controlling the contents of this newly allocated block, an attacker can overwrite critical pointers within the Broadcast DVR User Service's execution context. When the service subsequently attempts to dereference these corrupted pointers, it redirects execution flow to the malicious payload injected into the heap space. This mechanism bypasses many standard security mitigations because the exploitation relies on timing and memory layout rather than traditional buffer overflow overwrites of stack-based return addresses, making detection more challenging without advanced runtime protection mechanisms like Heap Spray Prevention or Control Flow Guard enabled effectively.
Mitigation strategies for this vulnerability primarily involve applying the latest cumulative updates provided by Microsoft, which contain patches that correct the memory management logic within the Broadcast DVR User Service to ensure pointers are properly invalidated after deallocation and prevent access to freed memory regions. Organizations should prioritize patching systems where this service is active, particularly those exposed to internal network threats or shared user environments where credential theft might occur. Additionally, implementing strict application control policies such as Microsoft AppLocker or Windows Defender Application Control can restrict the execution of untrusted binaries even if an attacker gains a foothold through other means. Enabling advanced threat protection features that monitor for anomalous memory access patterns and heap corruption events provides an additional layer of defense against exploitation attempts targeting this specific class of vulnerabilities.