Buffer Overflow in Linux Kernel UDP Reuse Port Handling

CVE-2026-52910

What is CVE-2026-52910?

A vulnerability exists in the Linux kernel's handling of UDP reuse ports which may lead to buffer overflow issues. When a cBPF program is replaced while another thread is sending a UDP packet to the reuse port group, improper resource management can occur. Specifically, the reuseport program is freed without waiting for all RCU read operations to complete, which may lead to undefined behavior or crashes. This flaw highlights the importance of synchronizing access to shared resources within the kernel to maintain system stability.

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