Linux Kernel Nine-Year-Old Zero-Day Flaw | MSSP Advisory

A nine-year-old zero-day vulnerability in the Linux kernel was discovered by Theori security researcher using AI assistance. The flaw has existed undetected for nearly a decade across multiple kernel versions. The vulnerability affects the core Linux kernel that runs on most server infrastructure, including hypervisors and container platforms.

Your RMM agents, PSA servers, and virtualization infrastructure likely run Linux kernels with this nine-year exposure window. Client environments running Linux servers, Docker containers, or VMware ESXi hosts carry the same risk and expect immediate guidance on patch status and remediation timeline.