Description

A malicious virtual function can invoke the certain command handlers in the SMU, causing a denial of service due to out-of-bounds memory read.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "3.3",
  "pubDate": "2026-08-31T19:16:44.890Z",
  "pubdate": "2026-08-31T19:16:44.890Z",
  "executiveSummary": "This vulnerability involves an out-of-bounds (OOB) memory read within the System Management Unit (SMU) of the affected product. The flaw originates from the improper handling of virtual functions that interact with internal command handlers.\nBy manipulating these virtual functions, an attacker can trigger an out-of-bounds access, resulting in a denial-of-service (DoS) condition. This disruption occurs because the SMU processes malformed input that causes the system to access memory locations outside the intended operational range, potentially leading to system instability, kernel panics, or non-responsive hardware states.\nThe vulnerability requires the ability to interface with the SMU, which typically necessitates a level of privilege capable of executing specific commands or invoking hardware-level interfaces. The impact is primarily a denial-of-service, though out-of-bounds read vulnerabilities can theoretically facilitate information leakage depending on the specific memory layout and the accessibility of adjacent data structures.\nExploitation does not necessarily require network connectivity if the attacker has local access to the system. However, the integrity and availability of the hardware management layer are at risk, necessitating immediate attention to input validation protocols within the SMU command-handling architecture.",
  "technicalDetails": "The vulnerability resides within the System Management Unit (SMU) component, specifically in the logic responsible for routing and executing command handlers via virtual function calls. The root cause is a lack of rigorous bounds checking on parameters passed to these virtual functions during the command invocation process.\nThe exploitation flow begins when an attacker identifies the interface used to trigger SMU command handlers. By injecting a crafted command or manipulating the virtual function table (vtable) entry, an attacker can influence the execution flow to point toward unauthorized handlers or legitimate handlers with out-of-range arguments. When the SMU executes the associated virtual function, it uses the provided index or address to perform a memory access operation.\nBecause the input is not validated against defined memory buffer boundaries, the SMU performs an out-of-bounds read. This access may target peripheral registers, sensitive internal kernel memory, or unmapped memory regions. If the accessed memory address resides in an invalid or protected region, the CPU triggers a memory management exception, resulting in a system halt or an unhandled hardware exception. This effectively causes a total denial-of-service.\nThe technical complexity of this vulnerability lies in the interaction between software-based virtual function invocation and hardware-level memory management. The SMU serves as a critical bridge between software drivers and hardware execution; therefore, any memory corruption or OOB access in this context bypasses standard OS-level protections. If the OOB read is successful without immediate crashing, an attacker might be able to read back sensitive data stored in adjacent memory, though the primary observed impact remains the disruption of service.\nSuccessful exploitation requires the attacker to have sufficient privileges to interact with the SMU communication interface, typically requiring driver-level access or elevated system permissions. Since the SMU manages low-level hardware orchestration, the vulnerability is inherently tied to the firmware and driver layer interaction. Mitigating this requires implementing strict bounds validation at the entry point of every SMU command handler to ensure that all indices and pointers remain within the sanctioned memory map before the virtual function is executed."
}