CVE-2023-31248

Summary

CVE-2023-31248 is a local privilege escalation vulnerability affecting Linux Kernel's nftables. The issue lies in the `nft_chain_lookup_byid()` function, which fails to verify if a chain is active. As a result, an attacker with local access can manipulate inactive nftables chains and exploit a use-after-free condition. Successful exploitation grants the attacker CAP_NET_ADMIN privileges, elevating their access to the network namespace. This vulnerability poses a significant risk to Linux systems and requires an immediate software update to mitigate the potential impact.

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