What is CVE-2023-0386?

CVE-2023-0386 is a high-severity vulnerability in Linux Kernel, classified under CWE-282. CVSS score: 7.8/10. Published 2023-03-22.

How severe is CVE-2023-0386?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2023-0386 known to be exploited?

Yes. CVE-2023-0386 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-06-17), indicating it is being actively exploited. 86 public proof-of-concept repositories are indexed.

Vulnerability in Linux Kernel

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.

Published 2023-03-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.079 (94.7th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.079 · newest: 0.079 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-282

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2025-06-17. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2025-07-08.

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.

Public proof-of-concept exploits

References

git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Broken Link, Vendor Advisory)
security.netapp.com/advisory/ntap-20230420-0004/ (Third Party Advisory)
www.debian.org/security/2023/dsa-5402 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2023/06/msg00008.html (mailing-list, Mailing List, Third Party Advisory)
packetstormsecurity.com/files/173087/Kernel-Live-Patch-Security-Notice-LSN-0095… (Third Party Advisory)
lists.debian.org/debian-lts-announce/2024/06/msg00020.html (mailing-list, Mailing List, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2023-0386?: CVE-2023-0386 is a high-severity vulnerability in Linux Kernel, classified under CWE-282. CVSS score: 7.8/10. Published 2023-03-22.
How severe is CVE-2023-0386?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2023-0386 known to be exploited?: Yes. CVE-2023-0386 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-06-17), indicating it is being actively exploited. 86 public proof-of-concept repositories are indexed.