Linux Kernel Improper Ownership Management Vulnerability (CVE-2023-0386)
Severity: high · Patch status: patched · Since 2025-06-17 · CVE-2023-0386
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. CISA added CVE-2023-0386 to its Known Exploited Vulnerabilities catalog on Jun 17, 2025, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Jul 8, 2025 (BOD 22-01); treat that as the outer limit.
Sources
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