UBUNTU-CVE-2026-93829: Low severity ubuntu/linux vulnerability

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix races in cifsd thread creation The cifsd demultiplex thread can run and access tcpses before the parent thread has finished populating tcpses, which the worker thread accesses locklessly. Also, the kthreadrun macro may start the thread before returning the thread pointer. Because the pointer is part of the structure that the thread can access, if the kernel is preempted after the thread is spawned, but before the thread pointer is populated and the thread attempts to exit, it will sleep, waiting for a SIGKILL signal. Fix this by moving creation of the thread to after all of tcpses'es fields are populated, and spawning the thread last, using a split kthreadcreate/wakeupprocess logic.