CVE-2023-0386: Linux Kernel Improper Ownership Management Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 17 Jun 2025, 818 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 7.9%
EPSS score, percentile 94.7 of all scored records
- How severe?
- 7.8 High
CVSS v3.1 base score, from CISA's enrichment of the record
- What should I do?
CISA deadline 8 Jul 2025. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Which versions are affected?
Affected
- Linux kernel 6.2-rc6
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by 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.
CISA due date for this action: 8 July 2025.
Advisories and patches
Linked from CISA's catalog entry
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4f11ada10d0a
- https://access.redhat.com/security/cve/cve-2023-0386
- https://security.netapp.com/advisory/ntap-20230420-0004/
- https://nvd.nist.gov/vuln/detail/CVE-2023-0386
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | Linux kernel 6.2-rc6 |
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
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.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2023-0386 to its Known Exploited Vulnerabilities (KEV) catalog on 17 Jun 2025.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 8 Jul 2025.
- The CVE record was published on 22 Mar 2023, 818 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 7.8 (High), taken from CISA's enrichment of the record.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 7.9% (percentile 94.7), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 22 Mar 2023 | CVE record published |
| 17 Jun 2025 | Added to CISA KEV |
| 8 Jul 2025 | CISA due date for the required action |
| 21 Oct 2025 | CVE record last updated |
References
- git.kernel.org
- security.netapp.com
- [debian-lts-announce] 20230605 [SECURITY] [DLA 3446-1] linux-5.10 security update
- packetstormsecurity.com
- [debian-lts-announce] 20240627 [SECURITY] [DLA 3840-1] linux security update
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