Linux Kernel Improper Ownership Management Vulnerability
n/a — Kernel
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.
7.8
7.9%
Vector breakdown
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published
- Mar 22, 2023
- Modified
- Oct 21, 2025
- Added to KEV
- Jun 17, 2025
- Federal patch due
- Jul 8, 2025
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2023-0386, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2023-0386 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2023-0386?
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.
How severe is CVE-2023-0386?
CVE-2023-0386 has a CVSS base score of 7.8 out of 10 (CVSS 3.1).
Is CVE-2023-0386 actively exploited in the wild?
Yes. CVE-2023-0386 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Jun 17, 2025, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2023-0386?
7.9% - meaning FIRST.org's EPSS model estimates a 7.9% probability this vulnerability will be exploited in the wild within 30 days (94% percentile among all scored CVEs).
What type of vulnerability is CVE-2023-0386?
CVE-2023-0386 is classified under CWE-282.
Cross-checked against
Impactr finds and proves whether CVE-2023-0386 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
Join the waitlist