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

Patch now

HIGH 7.8EXPLOITEDWATCHLISTMITIGATEMITIGATEMITIGATE

CVE-2023-0386 is a high-severity flaw (CVSS 7.8) affecting debian linux, h300s firmware, h500s firmware, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
EPSS top 5%: very likely to be exploited
Exploited in the wild (CISA KEV)
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	7.9% (top 5%)
CISA exploited list	Yes, fix due 2025-07-08
Weakness	CWE-282
Published	2023-03-22
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: debian · netapp

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-03-22 21:15 UTCPublished CVE record published
2025-06-17Exploited Added to the CISA Known Exploited Vulnerabilities list
2025-07-08Deadline CISA due date for US federal agencies to patch
2026-06-17 05:25 UTCUpdated Record last modified

debian debian linux MITIGATE

Affected: 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

netapp h300s firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

netapp h500s firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

netapp h700s firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

netapp h410s firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

netapp h410c firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · python-wrapt · FIXED · 2.5.2-1.eln159 · FEDORA-2026-5503ee9370 · source

sudo dnf upgrade --advisory=FEDORA-2026-5503ee9370

Fedora 46 · python-wrapt · FIXED · 2.5.2-1.fc46 · FEDORA-2026-8a83579801 · source

sudo dnf upgrade --advisory=FEDORA-2026-8a83579801

Ubuntu 20.04 · linux · NOT AFFECTED

Ubuntu 22.04 · linux · FIXED · 5.15.0-70.77

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "5.15.0-70.77" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · linux · NOT AFFECTED

Ubuntu 24.10 · linux · NOT AFFECTED

Ubuntu 22.04 · linux-allwinner-5.19 · NOT AFFECTED

Debian 12 · linux · FIXED · 6.1.11-1

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.1.11-1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · linux · FIXED · 6.1.11-1

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.1.11-1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 8 · kernel-rt · FIXED · kernel-rt-4.18.0-425.19.2.rt7.230.el8_7

sudo dnf upgrade --advisory=RHSA-2023:1584 rpm -q kernel-rt

RHEL 8 · kernel · FIXED · kernel-4.18.0-425.19.2.el8_7

sudo dnf upgrade --advisory=RHSA-2023:1566 rpm -q kernel

RHEL 8.6 Extended Update Support · kernel · FIXED · kernel-4.18.0-372.51.1.el8_6

sudo dnf upgrade --advisory=RHSA-2023:1554 rpm -q kernel

RHEL 9 · kernel · FIXED · kernel-5.14.0-162.23.1.el9_1

sudo dnf upgrade --advisory=RHSA-2023:1703 rpm -q kernel

RHEL 9 · kernel-rt · FIXED · kernel-rt-5.14.0-162.23.1.rt21.186.el9_1

sudo dnf upgrade --advisory=RHSA-2023:1691 rpm -q kernel-rt

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: xkaneiki/CVE-2023-0386 (416 stars)
GitHub PoC: chenaotian/CVE-2023-0386 (123 stars)
GitHub PoC: sxlmnwb/CVE-2023-0386 (56 stars)
Write-up: git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4f11ada10d0a
GitHub PoC: 3yujw7njai/CVE-2023-0386
GitHub PoC: AiK1d/CVE-2023-0386
Metasploit: Local Privilege Escalation via CVE-2023-0386

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-0386?

debian linux: mitigate or apply the listed mitigation; h300s firmware: mitigate or apply the listed mitigation; h500s firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-0386 being exploited?

Yes. CVE-2023-0386 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2023-0386 affect?

CVE-2023-0386 affects debian linux, h300s firmware, h500s firmware. Severity is high (CVSS 7.8). 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 m

How urgent is CVE-2023-0386?

Priority 86/100. High severity; EPSS top 5%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; On your watchlist

Software pages

Linux kernel vulnerabilities · Debian vulnerabilities

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References

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