CVE-2026-93829

/// Technical description

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 tcp_ses before the parent

thread has finished populating tcp_ses, which the worker thread accesses

locklessly.

Also, the kthread_run 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 tcp_ses'es

fields are populated, and spawning the thread last, using a split

kthread_create/wake_up_process logic.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References