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

ksmbd: pin conn during async oplock break notification

smb2_oplock_break_noti() and smb2_lease_break_noti() store a ksmbd_conn
pointer in an async ksmbd_work and then queue that work on ksmbd-io.  The
work only increments conn->r_count, which prevents teardown from passing
the pending-request wait after the increment, but it does not pin the
struct ksmbd_conn object.

If connection teardown races with an oplock break notification, the last
conn reference can be dropped before the queued worker finishes.  The
worker then uses the freed conn in ksmbd_conn_write() and
ksmbd_conn_r_count_dec().

Take a real conn reference when publishing the conn pointer to the async
work item, and drop it after the notification work has decremented
r_count.  Apply the same lifetime rule to lease break notification, which
uses the same work->conn pattern.

https://git.kernel.org/stable/c/0f72fc9659d7f585460d43c158055df5afdcffb6

https://git.kernel.org/stable/c/14062c74e5b25c27edcff7a2fe0dc701c930b372

https://git.kernel.org/stable/c/6ecb252efa0b413ac3d9979fb4eec247f8fc1258

https://git.kernel.org/stable/c/793e1c7041b93af96ff87e678329bc16aee7ba88

https://git.kernel.org/stable/c/aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9

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