For vehicular metaverses, one of the ultimate user-centric goals is to optimize the immersive experience and Quality of Service (QoS) for users on board. Semantic Communication (SemCom) has been introduced as a revolutionary paradigm that significantly eases communication resource pressure for vehicular metaverse applications to achieve this goal. SemCom enables high-quality and ultra-efficient vehicular communication, even with explosively increasing data traffic among vehicles. In this article, we propose a hierarchical SemCom-enabled vehicular metaverses framework consisting of the global metaverse, local metaverses, SemCom module, and resource pool. The global and local metaverses are brand-new concepts from the metaverse's distribution standpoint. Considering the QoS of users, this article explores the potential security vulnerabilities of the proposed framework. To that purpose, this study highlights a specific security risk to the framework's SemCom module and offers a viable defense solution, so encouraging community researchers to focus more on vehicular metaverse security. Finally, we provide an overview of the open issues of secure SemCom in the vehicular metaverses, notably pointing out potential future research directions.

翻译：针对车载元宇宙，其核心用户目标之一是优化车内用户的沉浸式体验与服务质量（QoS）。语义通信（SemCom）作为一种革命性范式被引入，可显著缓解车载元宇宙应用中的通信资源压力，从而达成上述目标。即便车辆间数据流量呈爆炸式增长，SemCom仍能实现高质量、超高效的车载通信。本文提出了一种层次化的SemCom赋能车载元宇宙框架，该框架由全球元宇宙、局部元宇宙、SemCom模块和资源池构成。从元宇宙的分布视角来看，全球与局部元宇宙是全新概念。基于用户服务质量考量，本文探究了所提框架的潜在安全漏洞。为此，本研究着重指出来自框架SemCom模块的特定安全风险，并提出可行的防御方案，以期推动学术界更多关注车载元宇宙安全。最后，我们概述了车载元宇宙中安全SemCom的开放性问题，尤其指明了潜在未来研究方向。