SARA / Free Tools / KEV / CVE-2023-0386

CVE-2023-0386 on CISA KEV

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 loca

CISA KEV — Actively Exploited

Linux Kernel Improper Ownership Management Vulnerability

Vendor / Product
— / Linux / Kernel
Added to KEV
2025-06-17
BOD 22-01 due
2025-07-08
Ransomware use
Unknown
CVSS / EPSS
— — · EPSS 59.16%

01What CISA says about this vulnerability

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.

02Required action — verbatim from CISA

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

03Notes & references

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

VendorProductVersions
na / KernelLinux kernel 6.2-rc6

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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