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📌 Overview

CVE-2026-41651 is a local privilege escalation vulnerability affecting the PackageKit system service used in various Linux distributions.

The vulnerability is caused by a Time-of-Check to Time-of-Use (TOCTOU) race condition, which can be abused to manipulate package installation workflows and escalate privileges to root.

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⚠️ Impact

If successfully exploited, this vulnerability may allow a local unprivileged user to:

• Gain root-level privileges
• Execute arbitrary package installation scripts (RPM scriptlets)
• Modify system-level configurations
• Compromise system integrity and confidentiality

🧠 Note: This vulnerability requires local access and cannot be exploited remotely.

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🧩 Affected Versions

• PackageKit 1.0.2 → 1.3.4

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🔧 Fixed Version

• PackageKit 1.3.5

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🧬 Technical Description

The issue originates from an unsafe handling of transactional state within PackageKit. A race condition occurs between:

1. Validation phase (check permissions / flags)
2. Execution phase (perform privileged operation)

During this window, an attacker may manipulate system state, leading to unintended privileged execution.

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🛡️ Mitigation

To reduce risk:

• Upgrade PackageKit to version 1.3.5 or later
• Apply security updates from your Linux distribution vendor
• Restrict local user access on multi-user systems
• Monitor package management activity logs

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🧾 References

• Vendor Security Advisory (PackageKit)
• Linux Distribution Security Updates
• Common Vulnerabilities and Exposures: CVE-2026-41651

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📊 Risk Summary

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⚡ Disclaimer

This repository is for educational and defensive security purposes only.
No exploit code or malicious instructions are included.

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🧠 Stay Secure

Always keep systems updated and review privilege escalation risks in system services regularly.