CVE-2026-58538
Summary
by MITRE • 07/14/2026
Heap-based buffer overflow in Windows Bluetooth Service allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical heap-based buffer overflow within the Windows Bluetooth service that enables local privilege escalation for authenticated attackers. The flaw exists in how the Bluetooth service processes certain input data structures, specifically when handling memory allocation and data copying operations. When an authenticated user executes malicious code against the Bluetooth subsystem, the vulnerability can be exploited to corrupt adjacent heap memory regions, potentially allowing arbitrary code execution with elevated privileges.
The technical implementation of this vulnerability stems from improper bounds checking during heap memory operations within the bluetooth.exe process. Attackers can craft specially formatted Bluetooth communication packets or service requests that trigger the buffer overflow condition when processed by the vulnerable service component. This type of vulnerability falls under CWE-122 Heap-based Buffer Overflow, which occurs when a program writes more data to a heap-allocated buffer than it can hold. The exploitation typically involves manipulating heap metadata and memory layout to achieve code execution control.
From an operational perspective, this vulnerability creates a significant risk for systems where Bluetooth services are running with elevated privileges or where users have legitimate access to Bluetooth functionality. The attack requires local authentication since the service runs in a privileged context, making it particularly dangerous in environments where user accounts might be compromised. Once exploited, the attacker gains the ability to execute code with system-level privileges, potentially leading to full system compromise and persistence within the target environment.
The impact extends beyond simple privilege escalation as this vulnerability can be leveraged for lateral movement within networks where Bluetooth connectivity is enabled. Security frameworks such as MITRE ATT&CK recognize this pattern under T1068 Local Privilege Escalation techniques, where attackers exploit service vulnerabilities to gain elevated access rights. Organizations should prioritize patching this vulnerability through Microsoft security updates, while implementing additional monitoring for suspicious Bluetooth service activity and memory corruption patterns in system logs.
Mitigation strategies include applying the latest Windows security patches immediately, disabling unnecessary Bluetooth services when not required, and implementing application whitelisting controls for Bluetooth-related executables. Network segmentation can help limit the potential impact of exploitation by restricting access to systems with active Bluetooth services. Security teams should also monitor for anomalous memory allocation patterns and heap corruption indicators that might signal exploitation attempts against this vulnerability class.