CVE-2023-0386
Linux Kernel Improper Ownership Management Vulnerability
- Published
- Mar 22, 2023
- Updated
- Oct 21, 2025
- Assigning CNA
- redhat
- Evidence observed
- Jun 17, 2025
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 94.5%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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.
Sources
18- CVE-2023-0386Exploit
Local privilege escalation exploit for CVE-2023-0386 targeting Linux kernel overlayfs. Includes detailed vulnerability analysis, PoC code, and step-by-step exploitation guide using FUSE and user namespaces.
C-based proof-of-concept exploit for CVE-2023-0386, a Linux kernel privilege escalation via FUSE overlay filesystem and setuid misconfiguration.
Proof-of-concept exploit for CVE-2023-0386, a Linux OverlayFS local privilege escalation vulnerability. Demonstrates how incorrect file capability handling during copy-up allows unprivileged users to gain root access.
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