================================================================== BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:906 [inline] BUG: KASAN: use-after-free in hlist_del_init_rcu include/linux/rculist.h:184 [inline] BUG: KASAN: use-after-free in __xfrm_state_delete+0x3db/0x940 net/xfrm/xfrm_state.c:700 Write of size 8 at addr ffff888058d71118 by task syz.0.3980/17221 CPU: 0 PID: 17221 Comm: syz.0.3980 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 __hlist_del include/linux/list.h:906 [inline] hlist_del_init_rcu include/linux/rculist.h:184 [inline] __xfrm_state_delete+0x3db/0x940 net/xfrm/xfrm_state.c:700 xfrm_state_delete net/xfrm/xfrm_state.c:725 [inline] xfrm_state_flush+0x445/0x760 net/xfrm/xfrm_state.c:808 pfkey_flush+0x12f/0x480 net/key/af_key.c:1786 pfkey_process net/key/af_key.c:2865 [inline] pfkey_sendmsg+0xc70/0x1140 net/key/af_key.c:3721 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5ed/0x9a0 net/socket.c:2519 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2573 __sys_sendmsg net/socket.c:2602 [inline] __do_sys_sendmsg net/socket.c:2611 [inline] __se_sys_sendmsg+0x1c3/0x2b0 net/socket.c:2609 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f98dafa8f19 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f98dbf58028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f98db225fa0 RCX: 00007f98dafa8f19 RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000004 RBP: 00007f98db037f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f98db226038 R14: 00007f98db225fa0 R15: 00007ffdf808dde8 Allocated by task 4277: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xb3/0x240 mm/slab_common.c:949 xfrm_state_init+0x125/0x470 net/xfrm/xfrm_state.c:2796 xfrm_net_init+0x1a3/0xeb0 net/xfrm/xfrm_policy.c:4186 ops_init+0x360/0x5e0 net/core/net_namespace.c:138 setup_net+0x4f2/0xbd0 net/core/net_namespace.c:336 copy_net_ns+0x33e/0x5b0 net/core/net_namespace.c:508 create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x116/0x160 kernel/nsproxy.c:226 ksys_unshare+0x4f6/0x8e0 kernel/fork.c:3289 __do_sys_unshare kernel/fork.c:3363 [inline] __se_sys_unshare kernel/fork.c:3361 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3361 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 4351: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1735 [inline] slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1761 slab_free mm/slub.c:3694 [inline] __kmem_cache_free+0xb6/0x200 mm/slub.c:3707 xfrm_hash_resize+0xdce/0xff0 net/xfrm/xfrm_state.c:198 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888058d71100 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 24 bytes inside of 64-byte region [ffff888058d71100, ffff888058d71140) The buggy address belongs to the physical page: page:ffffea0001635c40 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888058d71b00 pfn:0x58d71 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000077f8c8 ffffea0000c13fc8 ffff888018441640 raw: ffff888058d71b00 000000000020001d 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 4277, tgid 4277 (syz-executor), ts 70901446493, free_ts 21804382391 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 alloc_slab_page+0x5d/0x180 mm/slub.c:1805 allocate_slab mm/slub.c:1950 [inline] new_slab+0x87/0x2d0 mm/slub.c:2003 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3161 __slab_alloc mm/slub.c:3247 [inline] slab_alloc_node mm/slub.c:3332 [inline] __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3405 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc+0xa3/0x240 mm/slab_common.c:949 xfrm_state_init+0xa9/0x470 net/xfrm/xfrm_state.c:2790 xfrm_net_init+0x1a3/0xeb0 net/xfrm/xfrm_policy.c:4186 ops_init+0x360/0x5e0 net/core/net_namespace.c:138 setup_net+0x4f2/0xbd0 net/core/net_namespace.c:336 copy_net_ns+0x33e/0x5b0 net/core/net_namespace.c:508 create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x116/0x160 kernel/nsproxy.c:226 ksys_unshare+0x4f6/0x8e0 kernel/fork.c:3289 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509 free_contig_range+0x9d/0x150 mm/page_alloc.c:9506 destroy_args+0xef/0xa0e mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x33c/0x38e mm/debug_vm_pgtable.c:1359 do_one_initcall+0x257/0x800 init/main.c:1271 do_initcall_level+0x13d/0x1ed init/main.c:1344 do_initcalls+0x4b/0x8a init/main.c:1360 kernel_init_freeable+0x401/0x5ab init/main.c:1599 kernel_init+0x19/0x1b0 init/main.c:1487 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888058d71000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888058d71080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888058d71100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888058d71180: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888058d71200: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================