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BUG: KASAN: use-after-free in ieee80211_monitor_select_queue+0x20c/0x210 net/mac80211/iface.c:909
Read of size 2 at addr ffff0000f456cdfb by task syz.4.282/5511

CPU: 1 PID: 5511 Comm: syz.4.282 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
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:4233
 __dev_queue_xmit+0x738/0x3118 net/core/dev.c:4319
 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 21:
 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
 alloc_skb include/linux/skbuff.h:1303 [inline]
 wg_packet_send_keepalive+0x6c/0x23c drivers/net/wireguard/send.c:226
 wg_expired_send_persistent_keepalive+0x64/0x94 drivers/net/wireguard/timers.c:141
 call_timer_fn+0x1b8/0x95c kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x478/0x6f0 kernel/time/timer.c:2023
 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:2036
 handle_softirqs+0x318/0xc60 kernel/softirq.c:596
 run_ksoftirqd+0x7c/0x2ac kernel/softirq.c:968
 smpboot_thread_fn+0x4b0/0x964 kernel/smpboot.c:164
 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 ffff0000f456cc00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 507 bytes inside of
 512-byte region [ffff0000f456cc00, ffff0000f456ce00)

The buggy address belongs to the physical page:
page:00000000f827935c refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000f456cc00 pfn:0x13456c
head:00000000f827935c order:2 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 fffffc0003d21308 fffffc0003529308 ffff0000c0002600
raw: ffff0000f456cc00 0000000000100009 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f456cc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000f456cd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000f456cd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                                ^
 ffff0000f456ce00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000f456ce80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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