================================================================== BUG: KASAN: use-after-free in ieee80211_monitor_select_queue+0x20c/0x210 net/mac80211/iface.c:909 Read of size 2 at addr ffff0000f54145fb by task syz.0.857/8841 CPU: 0 PID: 8841 Comm: syz.0.857 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 __asan_report_load2_noabort+0x2c/0x38 mm/kasan/report_generic.c:349 ieee80211_monitor_select_queue+0x20c/0x210 net/mac80211/iface.c:909 netdev_core_pick_tx+0x130/0x320 net/core/dev.c:4245 __dev_queue_xmit+0x738/0x3118 net/core/dev.c:4331 dev_queue_xmit+0x24/0x34 include/linux/netdevice.h:3051 packet_snd net/packet/af_packet.c:3127 [inline] packet_sendmsg+0x2f9c/0x3fd0 net/packet/af_packet.c:3158 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5c8/0x938 net/socket.c:2518 ___sys_sendmsg net/socket.c:2572 [inline] __sys_sendmsg+0x288/0x374 net/socket.c:2601 __do_sys_sendmsg net/socket.c:2610 [inline] __se_sys_sendmsg net/socket.c:2608 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2608 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 8463: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node_track_caller+0xe0/0x16c mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x264/0x714 net/core/skbuff.c:515 skb_copy+0x104/0x5f0 net/core/skbuff.c:1732 mac80211_hwsim_tx_frame_no_nl+0xb54/0x111c drivers/net/wireless/mac80211_hwsim.c:1729 mac80211_hwsim_tx_frame+0x1c0/0x1f4 drivers/net/wireless/mac80211_hwsim.c:2058 mac80211_hwsim_beacon_tx+0x4c8/0x914 drivers/net/wireless/mac80211_hwsim.c:2121 __iterate_interfaces+0x204/0x484 net/mac80211/util.c:788 ieee80211_iterate_active_interfaces_atomic+0xd4/0x180 net/mac80211/util.c:824 mac80211_hwsim_beacon+0xc8/0x1b8 drivers/net/wireless/mac80211_hwsim.c:2147 __run_hrtimer kernel/time/hrtimer.c:1747 [inline] __hrtimer_run_queues+0x438/0xc3c kernel/time/hrtimer.c:1811 hrtimer_run_softirq+0x160/0x400 kernel/time/hrtimer.c:1828 handle_softirqs+0x318/0xc60 kernel/softirq.c:596 __do_softirq+0x14/0x20 kernel/softirq.c:630 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:46 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 kvfree_call_rcu+0xb4/0x6e8 kernel/rcu/tree.c:3405 ma_put+0x10c/0x190 net/ipv6/mcast.c:869 __ipv6_dev_mc_dec+0x2b4/0x324 net/ipv6/mcast.c:981 addrconf_leave_solict net/ipv6/addrconf.c:2209 [inline] __ipv6_ifa_notify+0x610/0xc34 net/ipv6/addrconf.c:6230 addrconf_ifdown+0xc28/0x15ec net/ipv6/addrconf.c:3922 addrconf_notify+0x340/0xc8c net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:2014 [inline] call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] dev_close_many+0x2d0/0x440 net/core/dev.c:1614 unregister_netdevice_many_notify+0x3dc/0x1834 net/core/dev.c:10997 unregister_netdevice_many net/core/dev.c:11077 [inline] default_device_exit_batch+0x9dc/0xa7c net/core/dev.c:11549 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x650/0xa84 net/core/net_namespace.c:640 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292 worker_thread+0x8c4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 The buggy address belongs to the object at ffff0000f5414400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 507 bytes inside of 512-byte region [ffff0000f5414400, ffff0000f5414600) The buggy address belongs to the physical page: page:00000000cd0649f2 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000f5416c00 pfn:0x135414 head:00000000cd0649f2 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003442d08 fffffc00033b8908 ffff0000c0002600 raw: ffff0000f5416c00 0000000000100006 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f5414480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f5414500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000f5414580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f5414600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f5414680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================