nft_compat

About this tag
The nft_compat tag on WindowsForum.com covers discussions about the Linux kernel's netfilter compatibility layer, specifically the nft_compat module that allows legacy x_tables extensions to work with the nftables framework. Tagged content includes analysis of kernel vulnerabilities such as CVE-2026-31424, which involves a mismatch in ARP hook numbering within the x_tables compatibility layer, leading to NULL pointer dereferences and kernel panics. Topics also explore how xt_check_match and xt_check_target validation functions handle traffic under NFPROTO_ARP, revealing deeper subsystem design flaws. This tag is relevant for Linux system administrators, security researchers, and developers working with netfilter, packet filtering, and kernel hardening.

  1. CVE-2026-31424: x_tables netfilter ARP hook mismatch causing NULL deref panic

    CVE-2026-31424 is a good example of the kind of Linux kernel vulnerability that looks narrow on paper but reveals a deeper subsystem design flaw once you unpack the mechanics. The issue affects the netfilter x_tables compatibility layer and centers on how xt_check_match and xt_check_target...
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    • arp filtering linux kernel netfilter x_tables nft_compat
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    • Forum: Security Alerts