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

ksmbd: scope conn->binding slowpath to bound sessions only

When the binding SESSION_SETUP sets conn->binding = true, the flag stays
set after the call so that the global session lookup in
ksmbd_session_lookup_all() can find the session, which was not added to
conn->sessions. Because the flag is connection-wide, the global lookup
path will also resolve any other session by id if asked.

Tighten the global lookup so that the returned session must have this
connection registered in its channel xarray (sess->ksmbd_chann_list).
The channel entry is installed by the existing binding_session path in
ntlm_authenticate()/krb5_authenticate() when a SESSION_SETUP completes
successfully, so this condition is a strict equivalent of "this
connection has been accepted as a channel of this session". Connections
that have not bound to a given session cannot reach it via the global
table.

The existing conn->binding gate for entering the slowpath is preserved
so that non-binding connections keep the fast-path-only behavior, and
the session->state check is unchanged.

https://git.kernel.org/stable/c/1e2bec062c5c9ec282636715166056d0998d746d

https://git.kernel.org/stable/c/1ff46c9915c1cbf454db58a8cb87f7cac818e6a6

https://git.kernel.org/stable/c/2cc8a4db633b10715450b291c1343859a4b2c509

https://git.kernel.org/stable/c/974c1c224e85549dc3459f3bb2255bbbdd2b9372

https://git.kernel.org/stable/c/b0da97c034b6107d14e537e212d4ce8b22109a58

https://git.kernel.org/stable/c/e3a93ce6e25757b8f375e38b8f91e1d9da4edc1a

https://git.kernel.org/stable/c/e74c00c6af428a39e564cdc5bd3a3648c6d8de87

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