Date: Tue, 12 Jan 2021 16:58:07 +1000 From: Wade Mealing <wmealing@...hat.com> To: oss-security@...ts.openwall.com Subject: CVE-2021-20177 kernel: iptables string match rule could result in kernel panic Gday, A flaw was found in the Linux kernels implementation of string matching within a packet. A privileged user (with root or CAP_NET_ADMIN ) when inserting iptables rules could insert a rule which can panic the system. Likely a user with these permissions could do worse, however it crashes the system (DOS) and the user is going to have a bad day especially if the rule is inserted and restored on every boot. At this time it doesn't affect RHEL releases, and there are fixes already in multiple upstream trees. Thanks, Wade Mealing Upstream patch: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca58fbe06c54 Upstream bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=209823 Red Hat Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1914719 -- Wade Mealing Product Security - Kernel, RHCE Red Hat <https://www.redhat.com> wmealing@...hat.com <https://red.ht/sig> TRIED. TESTED. TRUSTED. <https://redhat.com/trusted> secalert@...hat.com for urgent response
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