CVE-2023-4194 Information

Description

A flaw was found in the Linux kernel’s TUN/TAP functionality. This issue could allow a local user to bypass network filters and gain unauthorized access to some resources. The original patches fixing CVE-2023-1076 are incorrect or incomplete. The problem is that the following upstream commits - a096ccca6e50 ( un: tun_chr_open(): correctly initialize socket uid) - 66b2c338adce ( ap: tap_open(): correctly initialize socket uid) pass \inode->i_uid\ to sock_init_data_uid() as the last parameter and that turns out to not be accurate.

Reference

https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/ https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/ https://access.redhat.com/security/cve/CVE-2023-4194 https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/ https://bugzilla.redhat.com/show_bug.cgi?id=2229498