In the Linux kernel, the following vulnerability has been resolved:
tee: amdtee: fix use-after-free vulnerability in amdtee_close_session
There is a potential race condition in amdtee_close_session that may cause use-after-free in amdtee_open_session. For instance, if a session has refcount == 1, and one thread tries to free this session via:
kref_put(&sess->refcount, destroy_session);
the reference count will get decremented, and the next step would be to call destroy_session(). However, if in another thread, amdtee_open_session() is called before destroy_session() has completed execution, alloc_session() may return sess that will be freed up later in destroy_session() leading to use-after-free in amdtee_open_session.
To fix this issue, treat decrement of sess->refcount and removal of sess from session list in destroy_session() as a critical section, so that it is executed atomically.