Description

Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to disclose information locally.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.0",
  "pubDate": "2026-08-11T17:18:13.783Z",
  "pubdate": "2026-08-11T17:18:13.783Z",
  "executiveSummary": "A heap-based buffer overflow vulnerability has been identified within Windows Hyper-V, potentially allowing an authorized attacker to achieve local information disclosure.\nThe vulnerability resides in the memory management handling of the Hyper-V hypervisor component, specifically concerning how heap allocations and boundary checks are performed during internal data processing.\nSuccessful exploitation of this security flaw requires an attacker to possess local authorization and specific execution capabilities on the host or guest operating system depending on the architecture of the hypervisor interface.\nThe primary impact of this vulnerability is the unauthorized disclosure of sensitive memory contents, which could expose critical system data, cryptographic material, or internal state information useful for chaining further attacks.\nRisk implications remain localized to systems running the affected Windows Hyper-V configurations where proper privilege boundaries or input validation fail to prevent out-of-bounds read conditions within the heap structure.\nNo specific version numbers, file paths, or CVE identifiers are provided beyond the core description, but standard operational security practices apply to mitigate local exposure vectors.",
  "technicalDetails": "The vulnerability is classified as a heap-based buffer overflow, manifesting within the memory allocation and buffer management routines of Windows Hyper-V.\nRoot cause analysis indicates an inadequate bounds-checking mechanism when processing input data destined for heap-allocated memory buffers, leading to memory corruption or out-of-bounds read conditions.\nThe vulnerable component involves the internal data structures and parsing logic utilized by the Hyper-V hypervisor for handling localized control requests or inter-partition communication.\nAttackers must be locally authenticated and possess the requisite authorization to interact with the vulnerable Hyper-V subsystem.\nDuring the attack flow, the adversary supplies malformed or oversized input parameters to the target hypervisor interface.\nBecause the validation routines fail to restrict the input size relative to the allocated heap chunk size, subsequent read or write operations exceed the intended memory boundaries.\nIn the context of information disclosure, the out-of-bounds read condition permits the extraction of adjacent heap memory contents, potentially leaking kernel pointers, sensitive configuration data, or residual information from other virtual machines or the host system.\nThe exploitation method relies on manipulating internal state offsets to read unauthorized memory regions without triggering an immediate crash, thereby preserving execution stability while harvesting data.\nPost-exploitation impact is strictly bounded to local information disclosure, though the leaked data significantly enhances an attacker's situational awareness and aids in bypassing subsequent security mitigations such as KASLR or stack protections in multi-stage exploit chains."
}