CVE-2026-65814
Summary
by MITRE • 08/11/2026
Heap-based buffer overflow in Windows Storage Port Driver allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability exists within the Windows Storage Port Driver component which handles storage device communications and I/O operations for various storage controllers including SCSI and Fibre Channel interfaces. The heap-based buffer overflow occurs when the driver processes malformed input data from untrusted sources during storage operations, specifically when handling certain command structures or data payloads that exceed allocated buffer boundaries in the driver's memory management routines. The flaw stems from inadequate bounds checking mechanisms within the kernel-mode driver code where memory allocations are performed without proper validation of incoming data lengths before copying into fixed-size heap buffers.
The technical exploitation requires an attacker with local authenticated access to the system who can trigger the vulnerable code path through legitimate storage operations or by presenting crafted storage device responses that cause the driver to process maliciously formatted data. This type of vulnerability maps directly to CWE-121 Heap-based Buffer Overflow which is classified as a critical weakness in memory safety and represents one of the most prevalent attack vectors for privilege escalation in operating system kernels. The ATT&CK framework categorizes this as privilege escalation through kernel exploits under technique T1068, where attackers leverage driver-level vulnerabilities to gain SYSTEM level privileges.
When successfully exploited, the buffer overflow allows an attacker to overwrite adjacent memory locations including function pointers, return addresses, or other critical control data within the driver's execution context. This enables arbitrary code execution with kernel-level privileges, effectively providing complete system compromise without requiring additional attack vectors or exploitation techniques. The impact extends beyond simple privilege escalation as it can be used to bypass modern security controls such as address space layout randomization, data execution prevention, and other kernel-mode protections that typically prevent unauthorized code execution.
Mitigation strategies include applying the latest Microsoft security updates which contain patches for this specific vulnerability through the Windows Update mechanism or direct patch installation. Organizations should prioritize immediate deployment of the relevant security bulletins as the vulnerability represents a high-severity threat with readily available exploitation methods. Additionally, implementing least privilege principles for storage operations and restricting local access to systems running storage drivers can reduce the attack surface. Network segmentation and monitoring for unusual storage I/O patterns may help detect potential exploitation attempts, though the nature of this vulnerability means that successful exploitation typically occurs within the kernel context where such detection becomes increasingly difficult.