CVE-2026-54995 in Windows
Summary
by MITRE • 07/14/2026
Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 07/14/2026
The vulnerability described represents a use-after-free condition within the Reliable Multicast Transport Driver component of network communication systems, specifically affecting the rmcast driver implementation. This type of memory corruption flaw occurs when the system attempts to access memory that has already been freed by previous operations, creating a scenario where an attacker can manipulate the freed memory location to execute arbitrary code remotely. The vulnerability exists in the handling of multicast transport protocols where multiple network endpoints communicate using reliable delivery mechanisms, making it particularly dangerous in environments where multicast traffic is prevalent such as enterprise networks, industrial control systems, and real-time communication platforms.
The technical exploitation of this use-after-free condition follows established patterns documented in common weakness enumeration standards such as CWE-416, which specifically addresses the use of freed memory vulnerability. Attackers can craft malicious multicast packets that trigger the driver to release memory resources while simultaneously maintaining references to those locations, allowing them to overwrite critical data structures or function pointers with malicious payloads. This memory corruption can be leveraged to achieve privilege escalation from normal user contexts to kernel-level execution, bypassing standard security controls and access restrictions. The attack vector operates entirely over the network without requiring local system access, making it particularly dangerous for remote exploitation scenarios.
From an operational impact perspective, this vulnerability creates significant risks for organizations relying on multicast communication protocols where the rmcast driver is implemented. Network infrastructure components that utilize this driver become potential attack vectors for remote code execution, potentially allowing adversaries to compromise entire network segments or gain persistent access to critical systems. The nature of multicast communication means that a single successful exploitation can affect multiple recipients simultaneously, amplifying the potential damage and making detection more challenging. This vulnerability directly impacts the confidentiality, integrity, and availability of network services, as attackers can execute code remotely, modify system behavior, or cause denial of service conditions.
Mitigation strategies for this vulnerability should focus on immediate patch management and network segmentation approaches to limit exposure. Organizations must prioritize applying vendor-provided security updates that address the specific memory management issues within the rmcast driver implementation. Network administrators should implement monitoring solutions to detect anomalous multicast traffic patterns that could indicate exploitation attempts, while also considering firewall rules and access control measures to restrict multicast communication where possible. The remediation process involves not only updating the vulnerable driver components but also reviewing network configurations to ensure proper isolation of critical systems from potentially compromised multicast environments. Additionally, implementing runtime protections such as address space layout randomization and kernel exploit mitigation techniques can provide additional defense layers against exploitation attempts targeting this specific use-after-free condition.