CVE-2026-43215

In the Linux kernel, the following vulnerability has been resolved:

cifs: Fix locking usage for tcon fields

We used to use the cifs_tcp_ses_lock to protect a lot of objects

that are not just the server, ses or tcon lists. We later introduced

srv_lock, ses_lock and tc_lock to protect fields within the

corresponding structs. This was done to provide a more granular

protection and avoid unnecessary serialization.

There were still a couple of uses of cifs_tcp_ses_lock to provide

tcon fields. In this patch, I've replaced them with tc_lock.