CVE-2025-48822 in Windows
Summary
by MITRE • 07/08/2025
Out-of-bounds read in Windows Hyper-V allows an unauthorized attacker to execute code locally.
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Analysis
by VulDB Data Team • 08/29/2026
The vulnerability described involves a critical out-of-bounds read flaw within the Microsoft Hyper-V hypervisor component of the Windows operating system architecture. This specific type of memory corruption error, classified under Common Weakness Enumeration as CWE-125 Out-of-bounds Read, occurs when the software reads data from a memory location that is outside the boundaries of the intended buffer or array structure. In the context of Hyper-V, which manages virtual machine resources and hardware abstraction layers, such an error typically arises during the processing of specific guest-to-host communication channels or device emulation routines where input validation fails to properly constrain access requests. When an attacker triggers this condition by sending specially crafted packets or commands from a compromised virtual machine instance to the host hypervisor, they can cause the system to read sensitive memory contents that were not intended for public access.
The operational impact of this vulnerability is severe because it facilitates local privilege escalation and potential remote code execution depending on the specific attack vector utilized. Although the initial description notes an unauthorized attacker executing code locally, out-of-bounds reads in hypervisor components often serve as a precursor to more critical exploits such as heap spraying or information disclosure that can lead to full host compromise. An adversary with access to a guest virtual machine could leverage this flaw to escape the isolation boundary and gain control over the underlying physical hardware resources managed by Hyper-V. This breach of trust between the guest OS and the hypervisor undermines the fundamental security model of virtualization, allowing malicious actors to intercept sensitive data from other tenants running on the same host or install persistent backdoors at a level deeper than standard operating system malware.
From an offensive security perspective, this vulnerability aligns with MITRE ATT&CK techniques related to privilege escalation and defense evasion, specifically those involving hypervisor-level attacks such as VM escape. The exploitation of Hyper-V vulnerabilities is particularly dangerous because traditional endpoint detection systems running within the guest OS are often blind to activities occurring at the virtualization layer. Attackers can use this access to manipulate memory structures, steal cryptographic keys stored in host memory, or pivot further into internal network segments that rely on the integrity of the physical server infrastructure for security boundaries.
Mitigation strategies primarily involve applying the latest cumulative updates and security patches released by Microsoft specifically targeting Hyper-V components. Organizations should ensure that all virtualization hosts are kept up to date with the most recent service packs and hotfixes addressing memory safety issues in Windows kernel-mode drivers. Additionally, implementing strict network segmentation between management interfaces and guest workloads can limit the attack surface available to potential adversaries. Enabling hardware-enforced stack protection features such as Control Flow Guard and Data Execution Prevention on host systems provides an additional layer of defense against exploitation attempts that attempt to execute arbitrary code within privileged memory spaces. Regular auditing of virtual machine configurations and limiting administrative privileges for users managing Hyper-V environments further reduces the risk of successful exploitation by restricting the ability of attackers to trigger vulnerable code paths through elevated permissions or compromised management tools.