Description

Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-08-11T17:18:18.993Z",
  "pubdate": "2026-08-11T17:18:18.993Z",
  "executiveSummary": "This vulnerability is classified as a heap-based buffer overflow affecting Windows Storage. The security flaw allows an authorized local attacker to execute arbitrary code and achieve local privilege escalation within the operating system.\nThe target product is Windows Storage, a core system component responsible for managing storage spaces, disks, and volumes. Successful exploitation compromises system integrity and confidentiality, potentially enabling an adversary to attain the highest levels of access, such as SYSTEM privileges.\nThe risk implication is severe, as a low-privileged local user can leverage this flaw to subvert security boundaries. Exploitation requirements dictate that the attacker must already possess local access and authorization to interact with the vulnerable component.\nNo specific version numbers or external network exposure vectors are mentioned in the baseline description, framing this strictly as a local attack surface vector requiring prior authentication on the host system.",
  "technicalDetails": "The vulnerability resides within the heap memory management routines of the Windows Storage subsystem, specifically handling input data processing where boundary checks are missing or improperly implemented.\nThe root cause is a heap-based buffer overflow condition. This occurs when an application or kernel component writes data to a heap-allocated buffer without adequately validating the size of the incoming data relative to the allocated buffer capacity.\nAn authorized local attacker initiates the attack flow by interacting with the vulnerable Windows Storage component via programmatic interfaces, such as IOCTLs, system calls, or local APIs exposed by the service.\nDuring step-by-step exploitation, the attacker supplies a crafted payload containing data that exceeds the expected allocation size of the target heap buffer. As the component processes this input, the excess data overflows the boundaries of the heap chunk, corrupting adjacent heap metadata and adjacent memory structures.\nBy carefully manipulating the heap layout and overwriting critical function pointers, object vptrs, or sensitive control data structures within the heap, the attacker forces the application to redirect execution flow to attacker-controlled shellcode or arbitrary memory locations.\nBecause Windows Storage operates with elevated system contexts, successful redirection and execution of the payload running through the vulnerable component results in privilege escalation, granting the attacker higher privileges on the local machine.\nAuthentication requirements specify that the attacker must be authorized locally on the system to invoke the vulnerable functionality. The attack vector is strictly local, meaning remote network exposure is absent unless combined with a separate remote access vulnerability.\nPost-exploitation impact includes complete local compromise, unauthorized access to sensitive data, installation of persistent backdoors, and the ability to bypass local security controls."
}