Vulnerability in Linux Kernel Network Device Management

CVE-2026-53353

What is CVE-2026-53353?

The vulnerability in the Linux kernel relates to improper handling of the self node in the HSR (High-availability Seamless Redundancy) protocol. Specifically, the function hsr_addr_is_self() contains a warning statement that assumes the self node is intact during operations. However, this assumption is flawed as the self node can be cleared during specific calls to hsr_del_self_node(). This creates a potential window where users can access the device without the self node, leading to inconsistent network behavior. This vulnerability underscores the importance of robust error handling and assumption verification in network device management.

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