There is a use-after-free vulnerability in the Linux Kernel which can be exploited to achieve local privilege escalation. To reach the vulnerability kernel configuration flag CONFIGTLS or CONFIGXFRM_ESPINTCP has to be configured, but the operation does not require any privilege.
There is a use-after-free bug of icskulpdata of a struct inetconnectionsock.
When CONFIGTLS is enabled, user can install a tls context (struct tlscontext) on a connected tcp socket. The context is not cleared if this socket is disconnected and reused as a listener. If a new socket is created from the listener, the context is inherited and vulnerable.
The setsockopt TCP_ULP operation does not require any privilege.
We recommend upgrading past commit 2c02d41d71f90a5168391b6a5f2954112ba2307c