CVE-2026-94582 in Fabric OS
Summary
by MITRE • 10/08/2026
A memory buffer overflow vulnerability exists in the internal diagnostic and route validation routines used by the Fabric Shortest Path First (FSPF) protocol component of Brocade Fabric OS versions before 10.0.1. While this code path is part of internal diagnostic functionality and is not directly accessible via standard user interfaces or CLI management commands, an input processing flaw allows incoming or internally routed diagnostic state payloads to exceed allocated memory boundaries. An attacker that is able to chain or link other vulnerabilities to exploit this internal diagnostic could cause a heap- or stack-based memory overrun, resulting in a daemon crash (Denial of Service) or potential arbitrary code execution within the context of the routing daemon.
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Analysis
by VulDB Data Team • 10/08/2026
The vulnerability identified involves a critical memory buffer overflow located within the Fabric Shortest Path First protocol implementation found in Brocade Fabric OS versions prior to 10.0.1. This specific flaw resides in the internal diagnostic and route validation routines, which are responsible for processing state payloads related to network topology and routing information. Although this code path is not directly exposed through standard user interfaces or command-line interface management commands, it remains accessible via incoming traffic that triggers these internal diagnostic functions or through internally routed messages within the switch fabric. The core technical flaw stems from an input processing deficiency where the application fails to adequately validate the length of incoming data before copying it into a fixed-size memory buffer. This lack of boundary checking allows crafted payloads to exceed the allocated memory limits, leading to either heap-based or stack-based memory overruns depending on the specific execution context and allocation strategy employed by the routing daemon at the time of processing.
From an operational perspective, this vulnerability presents significant risks despite its indirect accessibility. An attacker who can leverage other vulnerabilities to reach this code path may trigger a denial of service condition by causing the FSPF daemon to crash due to memory corruption. In more severe scenarios where precise control over the overwritten memory is achieved, such as through careful manipulation of return addresses or function pointers within the corrupted stack frame, arbitrary code execution becomes possible. This would allow an attacker to execute malicious commands with the privileges of the routing process, potentially compromising the integrity and availability of the entire storage area network infrastructure. The severity is compounded by the fact that FSPF is a core protocol for maintaining fabric connectivity in Brocade environments, meaning successful exploitation could disrupt critical business operations dependent on uninterrupted SAN performance.
In terms of industry standard classifications, this vulnerability aligns with CWE-120 Buffer Copy without Checking Size of Input Classic Buffer Overflow and potentially CWE-787 Out-of-bounds Write if the overflow results in writing to adjacent memory structures unpredictably. The exploitation vector relates to ATT&CK technique T1496 Resource Hijacking or T1529 System Shutdown or Reboot via denial of service, depending on whether the outcome is a crash or code execution. Furthermore, since it involves network protocol processing, it falls under MITRE ATT&CK tactic TA0001 Initial Access if used as part of a chain to gain entry into the management plane, although its primary impact here is availability and potential privilege escalation within the host system context.
Mitigation strategies must prioritize immediate patching to version 10.0.1 or later where this input validation flaw has been corrected by implementing strict length checks before buffer operations. Until patches are applied, network segmentation should be enforced to restrict access to management interfaces and diagnostic ports from untrusted networks. Additionally, enabling enhanced logging for FSPF protocol messages can aid in detecting anomalous traffic patterns that may indicate exploitation attempts. Security teams should also review other potential entry points within the switch fabric to prevent attackers from chaining vulnerabilities to reach this internal diagnostic code path, as the vulnerability itself is not directly exploitable via standard administrative interfaces but requires a precursor exploit or insider access with specific routing capabilities.