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Date: Tue, 30 Aug 2022 12:27:44 +1000
From: David Leadbeater <>
Subject: CVE-2022-2663: Linux netfilter: nf_conntrack_irc message handling


I've found an issue in nf_conntrack_irc where the message handling can
be confused and it incorrectly matches on the message.


A firewall may be able to be bypassed when users are using unencrypted
IRC with nf_conntrack_irc configured.


Linux: Disable nf_conntrack_irc (remove any --helper irc rules, and/or
unload the kernel module)
MikroTik: Remove IRC from the service ports list (/ip
firewall/service-port/disable irc)

Fix is posted here:
It will be making its way into upstream Linux soon.

I'll update in a couple of days with complete details.


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