In the Linux kernel, the following vulnerability has been resolved: liveupdate: fix TOCTOU race in luo_session_retrieve() Extend the scope of the rwsem_read lock in luo_session_retrieve() to overlap with the acquisition of the session mutex. This prevents a concurrent thread from releasing and freeing the session between the lookup and the mutex lock.
https://git.kernel.org/stable/c/d944170607b872a1f93713c555ad3f0efde3a9b8
https://git.kernel.org/stable/c/d3ae9e7fddb4036f50003d7fa1ef52801fdb961b