cve 2026 31418

About this tag
CVE-2026-31418 is a Linux kernel vulnerability affecting netfilter ipset. The bug occurs in the mtype_del() function, which fails to treat a bucket as empty when its live entries have been removed but n->pos still points past deleted slots. This can lead to operational issues in firewall and network filtering setups. The fix involves releasing a logically empty bucket instead of attempting further shrinking. While the flaw is narrowly scoped, it sits in a critical part of the networking stack where small accounting mistakes can cause real problems. This tag covers discussions about the vulnerability, its technical details, and the patch that resolves it.

  1. CVE-2026-31418 ipset Fix: Netfilter Bucket Cleanup Bug Explained

    CVE-2026-31418 is a narrowly scoped Linux kernel bug, but it sits in a part of the stack where small accounting mistakes can still create real operational pain. The flaw affects netfilter ipset and, according to the published description, centers on mtype_del() failing to treat a bucket as empty...
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    • cve 2026 31418 linux kernel security netfilter ipset patch management
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