CVE-2023-4194

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 ("tun: tun_chr_open(): correctly initialize socket uid"), - 66b2c338adce ("tap: 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.

• CWE-843
• CWE-843
• CWE-863

• https://access.redhat.com/errata/RHSA-2023:6583Third Party Advisory
• https://access.redhat.com/security/cve/CVE-2023-4194Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2229498Issue Tracking, Third Party Advisory
• https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/Mailing List, Patch, Vendor Advisory
• https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/Mailing List, Patch, Vendor Advisory
• https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/Mailing List, Patch, Vendor Advisory
• https://access.redhat.com/errata/RHSA-2023:6583Third Party Advisory
• https://access.redhat.com/security/cve/CVE-2023-4194Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2229498Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/344H6HO6SSC4KT7PDFXSDIXKMKHISSGF/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3TYLSJ2SAI7RF56ZLQ5CQWCJLVJSD73Q/
• https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/Mailing List, Patch, Vendor Advisory
• https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/Mailing List, Patch, Vendor Advisory
• https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/Mailing List, Patch, Vendor Advisory
• https://security.netapp.com/advisory/ntap-20231027-0002/
• https://www.debian.org/security/2023/dsa-5480
• https://www.debian.org/security/2023/dsa-5492

Published

Aug 7, 2023

Last Modified

Jun 17, 2026

Status

Modified

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