CVE-2025-21652: In the Linux kernel, the following vulnerability has been resolved:  ipvlan: Fix use-after-free in ipvlan_get_iflink().  syzbot presented an use-after-free report [0] regarding ipvlan and linkwatch.  ipvlan does not hold a refcnt of the lower device unlike vlan and macvlan.  If the linkwatch work is triggered for the ipvlan dev, the lower dev might have already been freed, resulting in UAF of ipvlan->phy_dev in ipvlan_get_iflink().  We can delay the lower dev unregistration like vlan and macvlan by holding the lower dev's refcnt in dev->netdev_ops->ndo_init() and releasing it in dev->priv_destructor().  Jakub pointed out calling .ndo_XXX after unregister_netdevice() has returned is error prone and suggested [1] addressing this UAF in the core by taking commit 750e51603395 ("net: avoid potential UAF in default_operstate()") further.  Let's assume unregistering devices DOWN and use RCU protection in default_operstate() not to race with the device unregistration.  [0]: BUG: KASAN: slab-use-after-free in ipvlan_get_iflink+0x84/0x88 drivers/net/ipvlan/ipvlan_main.c:353 Read of size 4 at addr ffff0000d768c0e0 by task kworker/u8:35/6944  CPU: 0 UID: 0 PID: 6944 Comm: kworker/u8:35 Not tainted 6.13.0-rc2-g9bc5c9515b48 #12 4c3cb9e8b4565456f6a355f312ff91f4f29b3c47 Hardware name: linux,dummy-virt (DT) Workqueue: events_unbound linkwatch_event Call trace:  show_stack+0x38/0x50 arch/arm64/kernel/stacktrace.c:484 (C)  __dump_stack lib/dump_stack.c:94 [inline]  dump_stack_lvl+0xbc/0x108 lib/dump_stack.c:120  print_address_description mm/kasan/report.c:378 [inline]  print_report+0x16c/0x6f0 mm/kasan/report.c:489  kasan_report+0xc0/0x120 mm/kasan/report.c:602  __asan_report_load4_noabort+0x20/0x30 mm/kasan/report_generic.c:380  ipvlan_get_iflink+0x84/0x88 drivers/net/ipvlan/ipvlan_main.c:353  dev_get_iflink+0x7c/0xd8 net/core/dev.c:674  default_operstate net/core/link_watch.c:45 [inline]  rfc2863_policy+0x144/0x360 net/core/link_watch.c:72  linkwatch_do_dev+0x60/0x228 net/core/link_watch.c:175  __linkwatch_run_queue+0x2f4/0x5b8 net/core/link_watch.c:239  linkwatch_event+0x64/0xa8 net/core/link_watch.c:282  process_one_work+0x700/0x1398 kernel/workqueue.c:3229  process_scheduled_works kernel/workqueue.c:3310 [inline]  worker_thread+0x8c4/0xe10 kernel/workqueue.c:3391  kthread+0x2b0/0x360 kernel/kthread.c:389  ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862  Allocated by task 9303:  kasan_save_stack mm/kasan/common.c:47 [inline]  kasan_save_track+0x30/0x68 mm/kasan/common.c:68  kasan_save_alloc_info+0x44/0x58 mm/kasan/generic.c:568  poison_kmalloc_redzone mm/kasan/common.c:377 [inline]  __kasan_kmalloc+0x84/0xa0 mm/kasan/common.c:394  kasan_kmalloc include/linux/kasan.h:260 [inline]  __do_kmalloc_node mm/slub.c:4283 [inline]  __kmalloc_node_noprof+0x2a0/0x560 mm/slub.c:4289  __kvmalloc_node_noprof+0x9c/0x230 mm/util.c:650  alloc_netdev_mqs+0xb4/0x1118 net/core/dev.c:11209  rtnl_create_link+0x2b8/0xb60 net/core/rtnetlink.c:3595  rtnl_newlink_create+0x19c/0x868 net/core/rtnetlink.c:3771  __rtnl_newlink net/core/rtnetlink.c:3896 [inline]  rtnl_newlink+0x122c/0x15c0 net/core/rtnetlink.c:4011  rtnetlink_rcv_msg+0x61c/0x918 net/core/rtnetlink.c:6901  netlink_rcv_skb+0x1dc/0x398 net/netlink/af_netlink.c:2542  rtnetlink_rcv+0x34/0x50 net/core/rtnetlink.c:6928  netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]  netlink_unicast+0x618/0x838 net/netlink/af_netlink.c:1347  netlink_sendmsg+0x5fc/0x8b0 net/netlink/af_netlink.c:1891  sock_sendmsg_nosec net/socket.c:711 [inline]  __sock_sendmsg net/socket.c:726 [inline]  __sys_sendto+0x2ec/0x438 net/socket.c:2197  __do_sys_sendto net/socket.c:2204 [inline]  __se_sys_sendto net/socket.c:2200 [inline]  __arm64_sys_sendto+0xe4/0x110 net/socket.c:2200  __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]  invoke_syscall+0x90/0x278 arch/arm64/kernel/syscall.c:49  el0_svc_common+0x13c/0x250 arch/arm64/kernel/syscall.c:132  do_el0_svc+0x54/0x70 arch/arm64/kernel/syscall.c:151  el ---truncated---