CVE-2023-0461

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 CONFIG_TLSor CONFIG_XFRM_ESPINTCPhas to be configured, but the operation does not require any privilege.

There is a use-after-free bug of icsk_ulp_dataof a struct inet_connection_sock.

When CONFIG_TLSis enabled, user can install a tls context (struct tls_context) 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 setsockoptTCP_ULPoperation does not require any privilege.

We recommend upgrading past commit2c02d41d71f90a5168391b6a5f2954112ba2307c