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Exploited vulnerability · CISA KEV

Is CVE-2023-0386 exploited? Yes: in CISA KEV since 17 Jun 2025

Gociux · Linux Kernel · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-0386, Linux Kernel Improper Ownership Management Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 17 Jun 2025, 818 days after it was published. It affects Linux Kernel. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 17 Jun 2025
ransomwareNot knownno confirmed use
EPSStop 10%more likely than most to be exploited
severity7.8CVSS 3.1 · high
US federal due8 Jul 2025BOD 22-01 deadline

What it is

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.

VendorLinux (32 exploited CVEs in KEV)
ProductKernel
VulnerabilityLinux Kernel Improper Ownership Management Vulnerability
WeaknessCWE-282
Published22 Mar 2023
Added to KEV17 Jun 2025
Reported by (CNA)redhat

What to do

  1. Check whether you run it. Look for Kernel in your asset inventory, including appliances and cloud images. Stack check lists every exploited Linux CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 22 Mar 2023.
  4. Get told next time. Email alerts when CISA adds a CVE for Linux.

Other exploited CVEs in Kernel

References

Questions

Is CVE-2023-0386 being exploited?

Yes. CISA added CVE-2023-0386 to the Known Exploited Vulnerabilities catalog on 17 Jun 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-0386 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2023-0386?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Linux's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Kernel and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2025 · Linux scorecard · act-now radar.

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