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BUG: KASAN: use-after-free in read_pnet include/net/net_namespace.h:414 [inline]
BUG: KASAN: use-after-free in dev_net include/linux/netdevice.h:2738 [inline]
BUG: KASAN: use-after-free in nf_hook_entry_head+0x1f1/0x2c0 net/netfilter/core.c:319
Read of size 8 at addr ffff88804d8b0108 by task syz.7.2589/15923

CPU: 0 UID: 0 PID: 15923 Comm: syz.7.2589 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 read_pnet include/net/net_namespace.h:414 [inline]
 dev_net include/linux/netdevice.h:2738 [inline]
 nf_hook_entry_head+0x1f1/0x2c0 net/netfilter/core.c:319
 __nf_unregister_net_hook+0x74/0x6f0 net/netfilter/core.c:491
 nft_unregister_flowtable_ops net/netfilter/nf_tables_api.c:9038 [inline]
 __nft_unregister_flowtable_net_hooks net/netfilter/nf_tables_api.c:9053 [inline]
 nft_unregister_flowtable_net_hooks net/netfilter/nf_tables_api.c:9065 [inline]
 nf_tables_commit+0x4175/0xa3c0 net/netfilter/nf_tables_api.c:11224
 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:576 [inline]
 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:649 [inline]
 nfnetlink_rcv+0x1ac9/0x2590 net/netfilter/nfnetlink.c:667
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 ____sys_sendmsg+0x505/0x820 net/socket.c:2592
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2681
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f528e78f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f528f596038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f528e9e5fa0 RCX: 00007f528e78f749
RDX: 0000000000000880 RSI: 0000200000000500 RDI: 0000000000000003
RBP: 00007f528e813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f528e9e6038 R14: 00007f528e9e5fa0 R15: 00007f528eb0fa28
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88804d8b0dc0 pfn:0x4d8b0
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea000157d988 ffffea0000ceda08 0000000000000000
raw: ffff88804d8b0dc0 0000000000000001 00000000f0000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x402dc2(GFP_KERNEL_ACCOUNT|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), pid 13355, tgid 13350 (syz.4.1858), ts 530250846022, free_ts 530390119510
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210
 __alloc_pages_noprof mm/page_alloc.c:5244 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5164
 alloc_pages_bulk_mempolicy_noprof+0x341/0x1650 mm/mempolicy.c:2794
 vm_area_alloc_pages mm/vmalloc.c:3693 [inline]
 __vmalloc_area_node mm/vmalloc.c:3863 [inline]
 __vmalloc_node_range_noprof+0xa38/0x16a0 mm/vmalloc.c:4051
 __vmalloc_node_noprof mm/vmalloc.c:4111 [inline]
 __vmalloc_noprof+0xd2/0x120 mm/vmalloc.c:4127
 kvm_alloc_memslot_metadata arch/x86/kvm/x86.c:13410 [inline]
 kvm_arch_prepare_memory_region+0x33b/0xed0 arch/x86/kvm/x86.c:13487
 kvm_prepare_memory_region virt/kvm/kvm_main.c:1710 [inline]
 kvm_set_memslot+0x599/0x1310 virt/kvm/kvm_main.c:1940
 kvm_set_memory_region+0x966/0xb90 virt/kvm/kvm_main.c:2121
 kvm_vm_ioctl_set_memory_region+0x6f/0xd0 virt/kvm/kvm_main.c:2155
 kvm_vm_ioctl+0x957/0xc60 virt/kvm/kvm_main.c:5208
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 13350 tgid 13350 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2943
 vfree+0x25a/0x400 mm/vmalloc.c:3466
 kvm_arch_free_memslot+0xff/0x170 arch/x86/kvm/x86.c:13354
 kvm_free_memslot virt/kvm/kvm_main.c:962 [inline]
 kvm_free_memslots+0x15b/0x200 virt/kvm/kvm_main.c:983
 kvm_destroy_vm virt/kvm/kvm_main.c:1321 [inline]
 kvm_put_kvm+0x8b2/0xa80 virt/kvm/kvm_main.c:1354
 kvm_vm_release+0x43/0x50 virt/kvm/kvm_main.c:1377
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2d0/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d8b0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d8b0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804d8b0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                      ^
 ffff88804d8b0180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d8b0200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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