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On April 6, 2026, Photon's blog unveiled a notable security vulnerability within Apple's macOS system. Specifically, a logical error present in the TCP network implementation of the XNU kernel leads to a gradual degradation of TCP connection functionality after 49.7 days of continuous device operation. This particular vulnerability originates from a flaw in the time calculation within the kernel's timer management system. Once the system's uptime surpasses a certain threshold, it initiates a failure in the TCP protocol stack, consequently disrupting network connections. As of now, Apple has not issued a patch to address this problem. Users are strongly encouraged to remain vigilant and await official announcements regarding security updates.
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