CVE-2023-1076 Security feature bypass in Linux kernel

What is CVE-2023-1076?

CVE-2023-1076 is a medium-severity vulnerability in Linux kernel, published on 27 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw was found in the Linux Kernel. The tun/tap sockets have their socket UID hardcoded to 0 due to a type confusion in their initialization function. While it will be often correct, as tuntap devices require CAP_NET_ADMIN, it may not always be the case, e.g., a non-root user only having that capability. This would make tun/tap sockets being incorrectly treated in filtering/routing decisions, possibly bypassing network filters.

Weakness: CWE-843, CWE-791

Which versions are affected by CVE-2023-1076?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-1076?

Apply the vendor's patch.

Is CVE-2023-1076 being exploited?

There is no known exploitation of CVE-2023-1076 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2023-1076, GHSA-f7qv-v8h9-5244, UBUNTU-CVE-2023-1076, openSUSE-SU-2024:12779-1.