CVE-2023-4194
mediumA flaw was found in the Linux kernel's TUN/TAP functionality.
Vendor / product: Linux — linux kernel
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.
CVSS
5.5
5.5 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2023-08-07 14:15
Modified: 2026-11-03 05:18
NVD status: Modified
Last synced 1 hour ago
Verified against the source API 2026-11-03 05:28 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
linux / linux_kernel ≤6.4, 6.5
redhat / enterprise_linux 8.0, 9.0
fedoraproject / fedora 37, 38
debian / debian_linux 10.0, 11.0, 12.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/
Patch / mitigation: https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/
Patch / mitigation: https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/
Patch / mitigation: https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/
Patch / mitigation: https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/
Patch / mitigation: https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/
References
- https://access.redhat.com/errata/RHSA-2023:6583 secalert@redhat.com
- https://access.redhat.com/security/cve/CVE-2023-4194 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2229498 secalert@redhat.com
- https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/ secalert@redhat.com
- https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/ secalert@redhat.com
- https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/ secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2023:6583 af854a3a-2127-422b-91ae-364da2661108
- https://access.redhat.com/security/cve/CVE-2023-4194 af854a3a-2127-422b-91ae-364da2661108
- https://bugzilla.redhat.com/show_bug.cgi?id=2229498 af854a3a-2127-422b-91ae-364da2661108
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html af854a3a-2127-422b-91ae-364da2661108
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/mes... af854a3a-2127-422b-91ae-364da2661108
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/mes... af854a3a-2127-422b-91ae-364da2661108
- https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/ af854a3a-2127-422b-91ae-364da2661108
- https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/ af854a3a-2127-422b-91ae-364da2661108
- https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/ af854a3a-2127-422b-91ae-364da2661108
- https://security.netapp.com/advisory/ntap-20231027-0002/ af854a3a-2127-422b-91ae-364da2661108
- https://www.debian.org/security/2023/dsa-5480 af854a3a-2127-422b-91ae-364da2661108
- https://www.debian.org/security/2023/dsa-5492 af854a3a-2127-422b-91ae-364da2661108
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 05:28 UTC · record ↗