CVE-2023-51786

Unauthorized file access through Linux user namespaces

Published Mar 7, 2024 · Updated Aug 27, 2024

Improper access control in OpenSFS Lustre 2.12.0 through 2.15.3 allows local users to read protected files through Linux user namespaces. The public notice ties exposure to user namespaces but does not identify the code path that misapplies user or group identity checks. Exploitation requires affected client, server, and client-distribution versions, and access remains limited to files visible through the client mountpoint.

CVSS severity9.1
Critical
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in OpenSFS Lustre 2.12.0 through 2.15.3 allows local users to read protected files through Linux user namespaces. The public notice ties exposure to user namespaces but does not identify the code path that misapplies user or group identity checks. Exploitation requires affected client, server, and client-distribution versions, and access remains limited to files visible through the client mountpoint.

The record

CVE
CVE-2023-51786
Published
Mar 7, 2024
Updated
Aug 27, 2024
Vendor
OpenSFS
Product
Lustre
Classifications
CWE-284, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.12.0 <2.15.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

OpenSFS · Lustreversion=2.12.0 <2.15.4

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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