CVE-2026-108461 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 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 broadcast-related functionalities on modern Windows operating systems, contains code paths where pointers to dynamically allocated memory objects are not properly invalidated after those objects have been freed. In standard software engineering practices, failing to nullify or update these dangling references creates a window of opportunity for malicious actors to manipulate the state of the application in ways that were not intended by the developers. When an attacker triggers this condition, they can cause the system to access and execute code based on stale memory addresses rather than valid, newly allocated data structures.
From a technical perspective, use-after-free vulnerabilities are particularly dangerous because they allow for arbitrary read and write operations within the context of the vulnerable process. In the case of the Broadcast DVR User Service, which typically runs with elevated privileges to manage hardware resources and system-level recording tasks, exploiting this flaw enables an attacker to overwrite critical function pointers or control flow data in memory. By carefully crafting heap allocations following the free operation, an attacker can place malicious shellcode or a payload that hijacks the execution flow of the service. This mechanism effectively bypasses standard security boundaries because the compromised process operates with higher trust levels than a typical user application, thereby granting the attacker administrative access to the underlying operating system without requiring additional authentication steps beyond initial local access.
The operational impact of this vulnerability is severe, as it directly compromises the integrity and confidentiality of the host machine. Once an attacker successfully exploits the use-after-free condition, they gain the ability to execute arbitrary code with SYSTEM-level privileges. This level of access allows for complete control over the operating system, including the installation of persistent backdoors, modification of security policies, theft of sensitive credentials stored in memory or on disk, and lateral movement within a network environment if the machine is connected. The presence of such a flaw undermines the fundamental principle of least privilege, as it provides an easy path from low-privileged user accounts to full system control, significantly increasing the attack surface for internal threats or compromised endpoints that have been infiltrated via phishing or other initial access vectors.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. The primary defense is the deployment of vendor-provided security patches that address the memory management logic within the Broadcast DVR User Service, ensuring that pointers are properly nullified after deallocation and that heap metadata is validated before use. Organizations should prioritize applying these updates to all affected systems as part of their standard vulnerability management lifecycle. Additionally, implementing application control policies such as Microsoft AppLocker or Windows Defender Application Control can restrict the execution of untrusted binaries in sensitive directories, thereby limiting the impact even if an exploit attempt occurs. Enabling advanced memory protection features like Data Execution Prevention and Address Space Layout Randomization further complicates exploitation by making it difficult for attackers to predict memory layouts and execute injected code. Regular auditing of service configurations and disabling unnecessary services like Broadcast DVR when not required can also reduce the overall attack surface available to potential adversaries.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-416, which describes use-after-free errors resulting from improper handling of freed memory pointers. In terms of tactical classification under the MITRE ATT&CK framework, this flaw facilitates privilege escalation techniques commonly associated with process injection and heap spraying attacks. Attackers typically utilize these methods to gain initial footholds or expand access after compromising a lower-privileged account. Understanding the specific mechanics of how the Broadcast DVR User Service handles memory allocation helps security teams tailor their detection rules to identify anomalous behavior patterns, such as unusual heap allocations or unexpected changes in process privilege levels, which may indicate an active exploitation attempt against this vulnerability.