CVE-2026-72166 net/9p: fix infinite loop in p9_client_rpc on fatal signal

In the Linux kernel, the following vulnerability has been resolved: net/9p: fix infinite loop in p9clientrpc on fatal signal When p9clientrpc is called with type P9TFLUSH and the transport has no peer e.g. fd transport backed by pipes with no 9p server, a fatal signal causes an infinite loop:...

CVE-2026-72166

CVE-2026-72166 affects the Linux kernel’s 9p client RPC path. In p9_client_rpc() when handling P9_TFLUSH, a fatal signal could cause an infinite loop if the transport has no peer, due to clearing TIF_SIGPENDING before rechecking signal_pending_state. The fix adds a check for fatal_signal_pending(...