CVE-2023-0386 Linux Kernel Improper Ownership Management

What is CVE-2023-0386?

CVE-2023-0386 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 22 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, where unauthorized access to the execution of the setuid file with capabilities was found in the Linux kernel’s OverlayFS subsystem in how a user copies a capable file from a nosuid mount into another mount. This uid mapping bug allows a local user to escalate their privileges on the system.

Weakness: CWE-282

Which versions are affected by CVE-2023-0386?

It affects 8 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware and 2 more.

How do I fix CVE-2023-0386?

Apply the vendor's patch. US federal agencies must fix it by 8 Jul 2025.

Is CVE-2023-0386 being exploited?

Yes. Attackers have exploited CVE-2023-0386 in the wild since at least 17 Jun 2025.

Public exploit code: 1 Metasploit module and 18 proofs of concept on GitHub.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

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

Also known as ALSA-2023:1691, ALSA-2023:1703, AZL-25742, DEBIAN-CVE-2023-0386, GHSA-p72q-v88c-rprq, RHSA-2023:1681 and 6 more.