Potential Use-After-Free Vulnerability in Linux Kernel Network Neighbor Management

CVE-2025-21763

Summary

The vulnerability in the Linux kernel's neighbor management subsystem relates to the __neigh_notify() function, which lacked proper protection with RCU (Read-Copy-Update) or RTNL (Reverse Tree Node Lock). This oversight could lead to potential use-after-free scenarios, enabling an attacker to exploit memory management errors. The implementation now adopts RCU protection to enhance stability and security, mitigating risks associated with improper memory access and ensuring more robust network operations.

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