Linux Kernel Vulnerability in AF_PACKET TX_RING Functionality

CVE-2026-80841

What is CVE-2026-80841?

This vulnerability in the Linux kernel's handling of AF_PACKET TX_RING can lead to improper management of memory references, affecting the integrity and efficiency of packet transmission processes. Specifically, it involves a flaw in how transmitted socket buffers (skbs) retain references to their corresponding ring frames. The vulnerability allows for a racing condition, where premature reference decrementing could lead to unaccounted socket buffers during cleanup operations. By restructuring the code implementation, the vulnerability addresses issues with deferred cleanup and socket write-memory management, ensuring that all transmitted socket buffers remain properly accounted for and that memory resources are handled safely throughout their lifecycle.

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