Date: Tue, 9 Aug 2022 14:10:35 -0300 From: Thadeu Lima de Souza Cascardo <cascardo@...onical.com> To: oss-security@...ts.openwall.com 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 CVE-2022-2586. 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 netfilter-devel@...r.kernel.org and are at https://firstname.lastname@example.org/T/#t.
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