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Date: Tue, 9 Aug 2022 14:10:35 -0300
From: Thadeu Lima de Souza Cascardo <>
Subject: CVE-2022-2586 - Linux kernel nf_tables cross-table reference UAF

CVE-2022-2586 - Linux kernel nf_tables cross-table reference UAF

It was discovered that a nft object or expression could reference a nft set on
a different nft table, leading to a use-after-free once that table was deleted.

Team Orca of Sea Security (@seasecresponse) working with Trend Micro's Zero Day
Initiative discovered that this vulnerability could be exploited for Local
Privilege Escalation. This has been reported as ZDI-CAN-17470, and assigned

This bug was introduced by commit 958bee14d071 ("netfilter: nf_tables: use new
transaction infrastructure to handle sets"), which is present since v3.16-rc1.

Exploiting it requires CAP_NET_ADMIN in any user or network namespace.

A PoC that will trigger KASAN is going to be posted in a week.

Fixes have been sent to and are at

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