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Linux CIFS Client Root Escalation Flaw Active Since 2007
June 2, 2026
A logic flaw in the Linux kernel CIFS client, present since 2007, lets unprivileged processes exploit request_key calls to escalate to root. The vulnerability affects any system mounting SMB/CIFS shares with an unpatched kernel.
HOW THIS AFFECTS YOU
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builderAudit any Linux systems mounting CIFS/SMB shares and apply kernel patches immediately — unprivileged local processes can reach root.
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policyA 17-year-old privilege escalation path in a widely deployed kernel subsystem raises questions about long-term code audit coverage for critical infrastructure.