CVE-2026-103565 in Windows
Summary
by MITRE • 10/13/2026
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 • 10/13/2026
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 exploited by authenticated users to achieve local privilege escalation. This specific service, which is responsible for managing digital video recording and broadcast-related functionalities on Windows operating systems, contains code paths where pointers to dynamically allocated memory objects are not properly invalidated after the associated resources have been released or destroyed. In standard software engineering practices, once a memory block is freed, any subsequent attempt to access it through dangling pointers should result in an immediate error or be prevented by robust safety checks. However, in this instance, the service fails to perform adequate validation before dereferencing these stale references, creating a window of opportunity for malicious exploitation.
From a technical perspective, use-after-free vulnerabilities are particularly dangerous because they allow attackers to manipulate memory layout and control program execution flow. When an attacker triggers the condition where freed memory is accessed again, they can often influence what data resides in that reclaimed memory space through heap spraying techniques or other allocation strategies. By carefully crafting inputs that cause specific allocations to occur at predictable addresses, a local user can overwrite critical function pointers or object headers within the reused memory block. This manipulation enables the attacker to redirect code execution to arbitrary locations, effectively bypassing standard security controls such as Data Execution Prevention and Address Space Layout Randomization under certain conditions. The severity of this flaw is amplified by its location in a system service that typically runs with elevated privileges, meaning successful exploitation grants the attacker significant control over the underlying operating system kernel or high-level subsystems.
The operational impact of exploiting this vulnerability allows an authorized but low-privileged user to escalate their rights to those equivalent to SYSTEM level access on the affected Windows host. This privilege escalation is critical because it provides unrestricted read and write access to sensitive files, registry keys, and running processes. An attacker leveraging this flaw could install persistent backdoors, disable security software such as antivirus or endpoint detection systems, exfiltrate confidential data, or pivot further into a network by using the compromised machine as a foothold for lateral movement. The existence of this vulnerability in a core Windows service means that it is present across many enterprise and consumer deployments where the Broadcast DVR User Service is enabled, increasing the potential attack surface significantly.
Industry standards classify this type of flaw under CWE-416, which denotes Use After Free vulnerabilities, highlighting the failure to manage memory lifecycle correctly. In terms of tactical mapping within the MITRE ATT&CK framework, exploitation of this vulnerability aligns with techniques related to Privilege Escalation via Exploitation of Local Vulnerabilities and potentially Memory Injection or Hooking depending on the specific method used to hijack execution flow after gaining control over the freed memory block. These classifications underscore the importance of rigorous input validation and secure coding practices in system-level software development.
Mitigation strategies for this vulnerability primarily involve applying the latest security patches provided by Microsoft, which address the improper pointer invalidation within the Broadcast DVR User Service codebase. Organizations should ensure that all Windows endpoints are updated to versions containing these fixes as a priority action. Additionally, defense-in-depth measures can reduce risk; implementing strict application control policies such as AppLocker or Windows Defender Application Control can prevent unauthorized binaries from executing even if an attacker gains initial access and attempts to leverage this flaw for escalation. Regular auditing of service configurations is also recommended, ensuring that unnecessary services like Broadcast DVR are disabled if they are not required for business operations, thereby reducing the attack surface available to potential local attackers.