------------[ cut here ]------------
memcpy: detected field-spanning write (size 20) of single field "pfx->in6_u.u6_addr8" at ./include/net/ipv6.h:614 (size 16)
WARNING: CPU: 0 PID: 6346 at ./include/net/ipv6.h:614 ipv6_addr_prefix+0x124/0x1d0 include/net/ipv6.h:614
Modules linked in:
CPU: 0 UID: 0 PID: 6346 Comm: syz.0.97 Not tainted 6.15.0-syzkaller-07774-g90b83efa6701 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:ipv6_addr_prefix+0x124/0x1d0 include/net/ipv6.h:614
Code: cc e8 e0 74 a6 f7 c6 05 a7 2d 71 05 01 90 b9 10 00 00 00 48 c7 c7 20 46 9e 8c 4c 89 fe 48 c7 c2 40 4d 9e 8c e8 1d 61 6a f7 90 <0f> 0b 90 90 e9 33 ff ff ff e8 ae 74 a6 f7 44 89 e6 48 c7 c7 80 80
RSP: 0018:ffffc90005556b30 EFLAGS: 00010246
RAX: e24600f969d12200 RBX: ffff88802fe0f050 RCX: 0000000000080000
RDX: ffffc9000bcc9000 RSI: 0000000000004f7b RDI: 0000000000004f7c
RBP: 0000000000000007 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa66c R12: 0000000000000014
R13: 1ffff92000aaad89 R14: ffffc90005556c64 R15: 0000000000000014
FS:  00007f35223996c0(0000) GS:ffff888125c66000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c258878 CR3: 00000000327da000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip6_route_info_create+0x4af/0x860 net/ipv6/route.c:3793
 ip6_route_add+0x28/0x190 net/ipv6/route.c:3889
 addrconf_prefix_route+0x210/0x2c0 net/ipv6/addrconf.c:2487
 addrconf_prefix_rcv+0x60b/0x1610 net/ipv6/addrconf.c:2878
 ndisc_router_discovery+0x2015/0x35f0 net/ipv6/ndisc.c:1570
 icmpv6_rcv+0x139a/0x1c80 net/ipv6/icmp.c:988
 ip6_protocol_deliver_rcu+0xe0b/0x15c0 net/ipv6/ip6_input.c:436
 ip6_input_finish+0xde/0x190 net/ipv6/ip6_input.c:480
 NF_HOOK+0x309/0x3a0 include/linux/netfilter.h:317
 ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:491
 ip6_mc_input+0x79a/0xbe0 net/ipv6/ip6_input.c:588
 NF_HOOK+0x309/0x3a0 include/linux/netfilter.h:317
 __netif_receive_skb_one_core net/core/dev.c:5977 [inline]
 __netif_receive_skb+0xd3/0x380 net/core/dev.c:6090
 netif_receive_skb_internal net/core/dev.c:6176 [inline]
 netif_receive_skb+0x1cb/0x790 net/core/dev.c:6235
 tun_rx_batched+0x1b9/0x730 drivers/net/tun.c:1485
 tun_get_user+0x298e/0x3ce0 drivers/net/tun.c:1938
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1984
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x54b/0xa90 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f352158d41f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f3522399000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f35217b5fa0 RCX: 00007f352158d41f
RDX: 00000000000003b6 RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007f3521610ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000003b6 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f35217b5fa0 R15: 00007ffcb6b2aa78
 </TASK>