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ExploitedIn CISA KEVFix available

CVE-2023-0386

Exploitation confirmed. First attested on 2025-06-17 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2023-03-22
  • WeaknessCWE-282

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2023-03-2221:15CVE publishedNVD
  2. 2025-06-17Added to the CISA KEV catalogCISA KEV
  3. 2025-06-17Listed as exploited by GCVEGCVE
  4. 2025-06-17Exploitation first reportedCISA KEV
  5. 2025-07-1703:55SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-0386?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-0386?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Canonical ubuntu linux
BranchAffectedFixed in
18.4= 18.04no fix published
20.4= 20.04no fix published
22.4= 22.04no fix published
Linux linux kernel
BranchAffectedFixed in
6.1≥ 5.16, < 6.1.96.1.9
5.x≥ 5.11, < 5.15.915.15.91
6.2= 6.2no fix published
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published

5 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As redhat, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Kernel
    Affected
    • = Linux kernel 6.2-rc6no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2024-06-27

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • dtb-aarch64openSUSE:Leap 15.4all versions · fixed in 5.14.21-150400.24.63.1and 10 other packages
  • kernelTuxCare:RHEL:7all versions · fixed in 3.10.0-1160.137.1.el7.tuxcare.els25and 10 other packages
  • kernelTuxCare:OracleLinux:7all versions · fixed in 3.10.0-1160.119.1.0.5.el7.tuxcare.els25and 10 other packages
  • kernelTuxCare:CentOS:8.5all versions · fixed in 4.18.0-348.7.1.el8_5.tuxcare.els8and 21 other packages
  • kernelTuxCare:CentOS:8.4all versions · fixed in 4.18.0-305.25.1.el8_4.tuxcare.els8and 21 other packages
  • kernelTuxCare:CentOS:7all versions · fixed in 3.10.0-1160.119.1.el7.tuxcare.els25and 10 other packages
  • kernelRocky Linux:8all versions · fixed in 0:4.18.0-425.19.2.el8_7
  • kernelRocky Linux:8all versions · fixed in 0:4.18.0-425.19.2.el8_7.cloud

143 more package ranges on OSV.dev

Vendor advisories

  • CVE-2023-0386 Red Hat Product Security799 products fixed

    kernel: FUSE filesystem low-privileged user privileges escalation

  • RHSA-2023:1970 Red Hat Product Security166 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2023:1984 Red Hat Product Security35 products fixed

    Red Hat Security Advisory: kpatch-patch security update

  • RHSA-2023:1980 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: kernel-rt security and bug fix update

  • RHSA-2023:1703 Red Hat Product Security166 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2023:1691 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: kernel-rt security and bug fix update

7 more advisories

Full record on NVD

Fix

  1. CISA’s required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.due 2025-07-08
  2. Vendor fix Red Hat Product Security RHSA-2023:1970 · 166 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
  3. Vendor fix Red Hat Product Security RHSA-2023:1984 · 35 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  4. Vendor fix Red Hat Product Security RHSA-2023:1677 · 2 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/2974891
  5. Workaround from the vendor Red Hat Product Security RHSA-2023:1970 · 166 productsTo mitigate this issue, prevent the module overlay from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically.

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
18 repositories, unverifiedveritas501/CVE-2023-0386Satheesh575555/linux-4.19.72_CVE-2023-0386xkaneiki/CVE-2023-0386chenaotian/CVE-2023-0386P4x1s/CVE-2023-0386
PoC-in-GitHub
Metasploit modules
1 moduleexploit/linux/local/cve_2023_0386_overlayfs_priv_escrank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2025-06-17
Patch Due Date
2025-07-08
Ransomware Use
Unknown
Required Action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2023-03-22
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-p72q-v88c-rprq

Frequently asked questions

What is CVE-2023-0386?

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.

Is CVE-2023-0386 actively exploited?

Yes. CVE-2023-0386 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2025-07-08.

What is the CVSS score for CVE-2023-0386?

CVE-2023-0386 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record