CVE-2023-0386 — Linux Kernel Improper Ownership Management 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 loca
Published
2023-03-22T00:00:00.000Z
Last modified
2025-10-21T23:15:22.744Z
CISA KEV — Actively Exploited
01What is 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.
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / Kernel | Linux kernel 6.2-rc6 |
03Active exploitation status
Yes — actively exploited. Added to the CISA KEV catalog on 2025-06-17. Ransomware use: Unknown.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:
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07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2023-03-22T00:00:00.000Z
- Last modified: 2025-10-21T23:15:22.744Z
- Added to CISA KEV: 2025-06-17
- BOD 22-01 due: 2025-07-08
09References
- git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4f…
- security.netapp.com — https://security.netapp.com/advisory/ntap-20230420-0004/
- www.debian.org — https://www.debian.org/security/2023/dsa-5402
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/06/msg00008.html
- packetstormsecurity.com — http://packetstormsecurity.com/files/173087/Kernel-Live-Patch-Security-Notice-LS…
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
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