In the Linux kernel, the following vulnerability has been resolved: staging: greybus: uart: fix tty use after free User space can hold a tty open indefinitely and tty drivers must not release the underlying structures until the last user is gone. Switch to using the tty-port reference counter to manage the life time of the greybus tty state to avoid use after free after a disconnect. CREATE(Triage):(User=admin) CVE-2021-47358 (https://nvd.nist.gov/vuln/detail/CVE-2021-47358)