CVE-2023-4015

Summary

CVE-2023-4015 is a use-after-free vulnerability affecting the Linux kernel's netfilter: nf_tables component. This issue can be exploited locally to achieve privilege escalation. When an error occurs while building a nftables rule, the immediate expressions in nft_immediate_deactivate() function can cause the chain and objects to be deactivated but later used. This leads to unbinding the chain, enabling an attacker to manipulate it for privilege escalation. To mitigate this risk, it is recommended to upgrade the Linux kernel past commit 0a771f7b266b02d262900c75f1e175c7fe76fec2.

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