What is the CVSS score of CVE-2026-58302?

CVE-2026-58302 has a CVSS 3.1 base score of 8.4 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

Linuxcnc CVE-2026-58302

Q: Which versions of Linuxcnc are affected by CVE-2026-58302?

LinuxCNC (uspace) versions before 2.9.9 contain a local privilege escalation vulnerability enabling any unprivileged user to execute code as root; no public exploit identified at time of analysis.. A patch is available.

Q: How to fix or mitigate CVE-2026-58302?

Within 24 hours: inventory all systems running linuxcnc-uspace prior to version 2.9.9; restrict local shell access to trusted personnel only. Within 7 days: upgrade linuxcnc-uspace to version 2.9.9 on development and staging environments; validate system functionality before production release. Within 30 days: deploy version 2.9.9 across all production systems; confirm no instances remain below the patched version.

EUVD-2026-40241 HIGH

Path Traversal (CWE-22)

2026-06-30 mitre

GHSA-h3vh-9phr-5gjm

Privilege Escalation Path Traversal Linuxcnc

8.4

CVSS 3.1 · Vendor: mitre

View

Vulnerability Assessment

Weakness

CWE

CWE-22

OWASP Top 10:2025

A01:2025 - Broken Access Control

ASVS 5.0

V5 - File Handling Path canonicalization, traversal prevention

MITRE ATT&CK

2 techniques across 2 tactics: Discovery, Collection

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jun 30, 2026

Local privilege escalation to root in LinuxCNC (linuxcnc-uspace) before 2.9.9 lets any unprivileged local user execute arbitrary code as root. The SUID-root rtapi_app helper accepts a user-supplied module name and passes it to dlopen() without sufficient validation, so path traversal lets an attacker load an arbitrary attacker-controlled shared library while the process is still privileged. No public exploit identified at time of analysis and the issue is not in CISA KEV; an upstream fix is available in version 2.9.9.

Affected VersionsENISA

LinuxCNC 0 <2.9.9

Affected Packages

euvd linuxcnc fix: 2.9.9

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (mitre) PRIMARY 8.4 HIGH

AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from Vendor (mitre) · only source for this CVE.

CVSS VectorVendor: mitre

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch available

Jun 30, 2026 - 03:01 EUVD

CVE Published

Jun 30, 2026 - 01:09 cve.org

HIGH 8.4

DescriptionCVE.org

rtapi_app in linuxcnc-uspace in LinuxCNC before 2.9.9 allows privilege escalation. It is installed SUID root and loads shared library modules via dlopen() by using a user-supplied module name. Insufficient validation of the module name allows path traversal, enabling an unprivileged local user to load an arbitrary shared library. Because the process retains elevated privileges during module loading, this results in local privilege escalation to root.

Executive ViewAI

Why It Matters

LinuxCNC (uspace) versions before 2.9.9 contain a local privilege escalation vulnerability enabling any unprivileged user to execute code as root; no public exploit identified at time of analysis. Organizations operating Linux-based CNC equipment face risk of complete system compromise through internal user access. Immediate patching is required to secure manufacturing control systems.

Recommended Action

Within 24 hours: inventory all systems running linuxcnc-uspace prior to version 2.9.9; restrict local shell access to trusted personnel only. Within 7 days: upgrade linuxcnc-uspace to version 2.9.9 on development and staging environments; validate system functionality before production release. Within 30 days: deploy version 2.9.9 across all production systems; confirm no instances remain below the patched version.

Business Impact: High

Compensating Controls

Apply vendor patch: upgrade linuxcnc-uspace to version 2.9.9 or later. Until deployment, restrict local system access to authenticated administrators and implement monitoring for privilege escalation attempts.

Threat Intelligence Overview

EPSS Score

0.2%

Top 95% exploitable

Social Media

Sightings

Data Quality

7 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment Vendor CIRCL

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision

Scheduled

Exploitation

None

System Exposure· derived

Small

Automatable

Human Impact

High

Technical Impact

Total

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +42

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.

Path Traversal HIGH

Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.