🚨 CVE-2026-46243 - `CIFSwitch`

Linux Kernel Local Privilege Escalation (LPE)

Local Privilege Escalation vulnerability affecting the Linux Kernel CIFS/SMB client.

📖 Overview

CVE-2026-46243 is a Local Privilege Escalation (LPE) vulnerability within the Linux Kernel's CIFS/SMB client.

Improper validation of cifs.spnego key descriptions allows an unprivileged local user to impersonate trusted kernel-generated requests under specific system configurations, potentially resulting in privilege escalation.

✨ Highlights

📌 Affected Configuration

Successful exploitation generally requires:

Linux kernel with CIFS enabled
cifs-utils
Default cifs.upcall
User namespaces enabled
Local shell access

⚠️ Impact

An attacker may be able to:

🔺 Escalate privileges
🔓 Bypass kernel trust assumptions
🛡️ Gain elevated execution context
⚙️ Compromise local system integrity

🛠 Mitigation

✅ Update to the latest patched Linux kernel
✅ Apply vendor security updates
✅ Keep cifs-utils updated
✅ Restrict unprivileged user namespaces when appropriate

📚 References

NIST National Vulnerability Database (NVD)
Linux Kernel Security Advisory
Ubuntu Security Notices
Red Hat Security Advisory

⚖️ Disclaimer

This repository is intended solely for educational, defensive security, and research purposes.

No offensive use is intended or supported.

Made with ❤️ by the Security Research Community

🆔 CVE	CVE-2026-46243
💻 Component	Linux Kernel
📂 Subsystem	CIFS / SMB Client
⚔️ Class	Local Privilege Escalation
🎯 Attack Vector	Local
🔐 Privileges Required	Low
👤 User Interaction	None
⚡ Impact	Privilege Escalation

CVE-2026-46243

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🚨 CVE-2026-46243 - CIFSwitch