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

ksmbd: track the connection owning a byte-range lock

SMB2_LOCK adds each granted byte-range lock to both the file lock list
and the lock list of the connection which handled the request.  The
final close and durable handle paths, however, remove the connection
list entry while holding fp->conn->llist_lock.

With SMB3 multichannel, the connection handling the LOCK request can be
different from the connection which opened the file.  The entry can
therefore be removed under a different spinlock from the one protecting
the list it belongs to.  A concurrent traversal can then access freed
struct ksmbd_lock and struct file_lock objects.

Record the connection owning each lock's clist entry and hold a
reference to it while the entry is linked.  Use that connection and its
llist_lock for unlock, rollback, close, and durable preserve.  Durable
reconnect assigns the new connection as the owner when publishing the
locks again.

https://git.kernel.org/stable/c/22d38cf75b556c20b039743bdf3654d535b858be

https://git.kernel.org/stable/c/427faaa52b0b399940c1a88065a5c310d10dad15

https://git.kernel.org/stable/c/5fecc15a30cb9ebd310f7b52c1ab607edcea78f6

https://git.kernel.org/stable/c/66eb3643164e5e1029907793926c132f8b5c6148

https://git.kernel.org/stable/c/c1016dd1d8b2bcd1158bbaabe94a31bb7e7431fb

https://git.kernel.org/stable/c/ea5c9bf99f626a15cc59f645dc895f2b3f01992e

https://git.kernel.org/stable/c/fe20d492a69a6f79e637f438072b212e21ed3b78

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