From 3239d21168c8731b0100570e17a904394be8f947 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=A3=8E=E6=89=87=E6=BB=91=E7=BF=94=E7=BF=BC?=
 <Fangliding.fshxy@outlook.com>
Date: Tue, 9 Jun 2026 17:40:55 +0800
Subject: [PATCH] TUN inbound: `autoOutboundsInterface` bypasses loopback
 addresses (#6276)

Fixes https://github.com/XTLS/Xray-core/issues/6269
---
 proxy/tun/handler.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/proxy/tun/handler.go b/proxy/tun/handler.go
index c26f14d5..d552eca5 100644
--- a/proxy/tun/handler.go
+++ b/proxy/tun/handler.go
@@ -2,6 +2,8 @@ package tun
 
 import (
 	"context"
+	"net/netip"
+	"strings"
 	"syscall"
 
 	"github.com/xtls/xray-core/common"
@@ -85,6 +87,11 @@ func (t *Handler) Start() error {
 				return nil
 			}
 			return c.Control(func(fd uintptr) {
+				addrPort, _ := netip.ParseAddrPort(address)
+				// skip loopback
+				if addrPort.Addr().IsLoopback() || strings.HasPrefix(strings.ToLower(address), "localhost:") {
+					return
+				}
 				err := setinterface(network, address, fd, iface)
 				if err != nil {
 					errors.LogInfoInner(context.Background(), err, "[tun] falied to set interface")