Linux Kernel Netfilter Vulnerability Affects Chain Rule Handling

CVE-2023-53492

What is CVE-2023-53492?

A vulnerability in the Linux Kernel's netfilter component allows for the potential mishandling of chain rules when a chain is deleted within the same batch. Specifically, when attempting to add a new rule that refers to a chain ID that has been recently deleted, the lookup may ignore the current generation mask. As a result, this can produce warnings during operation, indicating that the rule may end up targeting a non-existent chain, leading to unexpected behavior in network filtering processes. This issue underscores the importance of proper chain management within netfilter configurations.

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