---
title: "CVE-2023-0386: Linux Kernel Improper Ownership Management Vulnerability"
url: https://erroneo.us/security/cve/CVE-2023-0386/
description: "CVE-2023-0386 (Linux Kernel): Exploited in the wild (CISA KEV). A flaw was found in the Linux kernel, where unauthorized access to the execution of the…"
type: vulnerability-record
section: "Security Digest"
date_published: 2023-03-22
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2023-0386"
kev: true
cvss: 7.8
epss: 0.0788
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2023-0386: Linux Kernel Improper Ownership Management Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Linux Kernel. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-06-17, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-07-08 ; treat that as the outer limit, not the target.
- EPSS 7.9% , percentile 95: FIRST’s model estimates a 7.9% chance of exploitation activity in the next 30 days, higher than 95% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs local access needed. Lower urgency for most teams unless an attacker could already run code on the machine.

## What it is

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.

## Affected products (CVE record)

- n/a Kernel: Linux kernel 6.2-rc6

## Severity

- CISA-ADP CVSS 3.1: 7.8 `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2025-06-17; federal due date 2025-07-08. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 7.88% probability of exploitation activity in the next 30 days; percentile 95.

## Sources

- [DSA-5402](https://www.debian.org/security/2023/dsa-5402)
- [Listed in CISA KEV notes (git.kernel.org)](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4f11ada10d0a)
- [Listed in CISA KEV notes (access.redhat.com)](https://access.redhat.com/security/cve/cve-2023-0386)
- [Listed in CISA KEV notes (security.netapp.com)](https://security.netapp.com/advisory/ntap-20230420-0004/)
- [CVE.org record CVE-2023-0386](https://www.cve.org/CVERecord?id=CVE-2023-0386)
- [NVD entry CVE-2023-0386](https://nvd.nist.gov/vuln/detail/CVE-2023-0386)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-0386)
- [[debian-lts-announce] 20230605 [SECURITY] [DLA 3446-1] linux-5.10 security update](https://lists.debian.org/debian-lts-announce/2023/06/msg00008.html)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/173087/Kernel-Live-Patch-Security-Notice-LSN-0095-1.html)
- [[debian-lts-announce] 20240627 [SECURITY] [DLA 3840-1] linux security update](https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html)

---
Source page: https://erroneo.us/security/cve/CVE-2023-0386/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt