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

criticalknown exploitedpublic exploitCVE-2023-0386
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Linux Kernel contains an improper ownership management vulnerability, 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.

CSIRTS triage

vendor: Linuxproduct: KernelPrivilege escalation
What
An improper ownership management vulnerability allows unauthorized access to setuid files.
Who is affected
Local users of the Linux Kernel are affected.
Urgency
Immediate remediation is necessary as exploitation is possible and the vulnerability is critical.
Action
Update to the latest version of the Linux Kernel.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-06-17
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-0386

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2023-0386coverage & exploitation statusNVD · CVE.org

Recent advisories for Linux Kernel Improper

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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