CVE-2026-92150 in F Prime
Summary
by MITRE • 10/14/2026
F´ (F Prime) is a framework that enables development and deployment of spaceflight and other embedded software applications. Prior to 4.2.0, Svc::GenericHub fromBufferDriver_handler deserialization is vulnerable because the receive handler uses FW_ASSERT for externally influenced deserialization status and type validation and permits a command payload size subtraction to underflow. When an unauthenticated inter-processor hub peer sends a truncated buffer, an invalid HubType, or a header-only command-dispatch payload, malformed hub traffic aborts or resets the process, causing denial of service. This issue is fixed in version 4.2.0.
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Analysis
by VulDB Data Team • 10/14/2026
F Prime serves as a critical framework for developing and deploying embedded software applications within spaceflight systems and other high-reliability environments. The vulnerability identified affects the Svc::GenericHub component, specifically its fromBufferDriver_handler function, which is responsible for processing incoming command payloads over inter-processor communication channels. This handler manages the deserialization of data received from peer nodes in a distributed system architecture. In versions prior to 4.2.0, the implementation contains significant flaws in how it validates input parameters and handles buffer operations during the deserialization process. The core technical flaw lies in the reliance on FW_ASSERT for validating externally influenced deserialization status and type information. Assertions are typically intended as internal sanity checks that terminate execution when an unexpected state is detected, rather than as robust security controls designed to handle malicious or malformed external input gracefully. By using assertions for validation against untrusted data from network peers, the system fails to implement proper error handling mechanisms such as returning specific error codes or safely discarding invalid packets.
The operational impact of this vulnerability centers on a denial of service condition triggered by crafted inputs sent through an inter-processor hub connection. Because the communication channel may not enforce authentication in all configurations, an unauthenticated peer can exploit these flaws. Specifically, the handler permits a command payload size subtraction operation that is susceptible to integer underflow when processing truncated buffers or malformed headers. When an attacker sends a packet with an invalid HubType, a header-only dispatch payload lacking expected data fields, or a buffer shorter than anticipated by the deserialization logic, the arithmetic operation results in a negative value due to unsigned integer wrap-around. This incorrect size calculation leads to out-of-bounds memory access attempts or triggers assertion failures that abruptly terminate the process. The result is a complete loss of service for the affected node within the embedded system, which can disrupt critical spaceflight operations or industrial control processes dependent on continuous data flow and command execution.
From a classification perspective, this vulnerability aligns with CWE-20 Improper Input Validation, as the application fails to adequately verify that input meets specified requirements before processing it. Additionally, the use of assertions for security-critical validation points corresponds closely to CWE-613 Insufficient Session Expiration and CWE-754 Improper Check for Unusual or Exceptional Conditions, though more accurately maps to CWE-252 unchecked return value in contexts where failure leads to unsafe states. The exploitation technique involves sending malformed network packets to trigger a crash, which is categorized under the MITRE ATT&CK framework as T1498 Network Denial of Service, specifically within the context of resource exhaustion or application crashes via protocol abuse. This attack vector targets the availability component of the CIA triad by disrupting the operational continuity of embedded systems that rely on F Prime for inter-component communication.
Mitigation strategies primarily involve upgrading to version 4.2.0 or later, where these validation and arithmetic issues have been addressed through improved input sanitization and robust error handling routines. For environments unable to immediately patch, defensive coding practices should be implemented within custom extensions of the GenericHub component if possible. This includes replacing assertion-based checks with explicit conditional statements that validate buffer lengths against expected sizes before performing any subtraction or memory access operations. Developers must ensure that all integer arithmetic involving external inputs uses safe math libraries or manual overflow/underflow detection to prevent wrap-around errors. Furthermore, implementing strict authentication and authorization mechanisms for inter-processor hub connections can limit the attack surface by preventing unauthenticated peers from sending malicious payloads in the first place. Regular security audits of embedded communication protocols should also be conducted to identify similar patterns where internal debugging tools are misused as primary defense layers against external threats.