KASAN: use-after-free Write in skb_queue

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: use-after-free Write in skb_queue_tail net arm-msm	24				1	1842d	1842d	15/29	fixed on 2020/10/10 01:52
upstream	general protection fault in skb_queue_tail (2) wireless	2				2	1521d	1530d	0/29	auto-closed as invalid on 2021/10/23 19:22
upstream	general protection fault in skb_queue_tail (3) afs	19	C	inconclusive	done	9	844d	1078d	23/29	fixed on 2023/09/28 17:51
upstream	general protection fault in skb_queue_tail (4) bluetooth	2				1	37d	33d	0/29	moderation: reported on 2025/08/22 15:06

Process accounting resumed ================================================================== BUG: KASAN: use-after-free in __write_once_size include/linux/compiler.h:288 [inline] BUG: KASAN: use-after-free in __skb_insert include/linux/skbuff.h:1760 [inline] BUG: KASAN: use-after-free in __skb_queue_before include/linux/skbuff.h:1869 [inline] BUG: KASAN: use-after-free in __skb_queue_tail include/linux/skbuff.h:1903 [inline] BUG: KASAN: use-after-free in skb_queue_tail+0x11a/0x140 net/core/skbuff.c:2940 Write of size 8 at addr ffff888000101080 by task syz-executor.4/5261 CPU: 0 PID: 5261 Comm: syz-executor.4 Not tainted 4.19.193-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_store8_noabort+0x88/0x90 mm/kasan/report.c:438 __write_once_size include/linux/compiler.h:288 [inline] __skb_insert include/linux/skbuff.h:1760 [inline] __skb_queue_before include/linux/skbuff.h:1869 [inline] __skb_queue_tail include/linux/skbuff.h:1903 [inline] skb_queue_tail+0x11a/0x140 net/core/skbuff.c:2940 __netlink_sendskb net/netlink/af_netlink.c:1264 [inline] netlink_broadcast_deliver net/netlink/af_netlink.c:1389 [inline] do_one_broadcast net/netlink/af_netlink.c:1474 [inline] netlink_broadcast_filtered+0x74b/0xbc0 net/netlink/af_netlink.c:1518 netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1542 nlmsg_multicast include/net/netlink.h:591 [inline] xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1091 [inline] xfrm_send_acquire+0x81b/0xac0 net/xfrm/xfrm_user.c:2977 km_query+0xc5/0x210 net/xfrm/xfrm_state.c:2023 xfrm_state_find+0x1d21/0x2d90 net/xfrm/xfrm_state.c:1042 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1410 [inline] xfrm_tmpl_resolve+0x2f3/0xc20 net/xfrm/xfrm_policy.c:1455 xfrm_resolve_and_create_bundle+0xd8/0x3e0 net/xfrm/xfrm_policy.c:1753 xfrm_lookup_with_ifid+0x232/0x1c40 net/xfrm/xfrm_policy.c:2076 xfrm_lookup net/xfrm/xfrm_policy.c:2200 [inline] xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:2211 ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1124 rawv6_sendmsg+0xc65/0x36a0 net/ipv6/raw.c:931 inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115 __sys_sendmmsg+0x195/0x470 net/socket.c:2210 __do_sys_sendmmsg net/socket.c:2239 [inline] __se_sys_sendmmsg net/socket.c:2236 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007efd88fae188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 00000000000002e9 RSI: 0000000020000480 RDI: 0000000000000006 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000001f4 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd057548df R14: 00007efd88fae300 R15: 0000000000022000 Allocated by task 5261: kmem_cache_alloc+0x122/0x370 mm/slab.c:3559 skb_clone+0x151/0x3d0 net/core/skbuff.c:1293 __netlink_deliver_tap_skb net/netlink/af_netlink.c:296 [inline] __netlink_deliver_tap net/netlink/af_netlink.c:321 [inline] netlink_deliver_tap+0x955/0xb00 net/netlink/af_netlink.c:334 __netlink_sendskb net/netlink/af_netlink.c:1262 [inline] netlink_broadcast_deliver net/netlink/af_netlink.c:1389 [inline] do_one_broadcast net/netlink/af_netlink.c:1474 [inline] netlink_broadcast_filtered+0x73c/0xbc0 net/netlink/af_netlink.c:1518 netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1542 nlmsg_multicast include/net/netlink.h:591 [inline] xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1091 [inline] xfrm_send_acquire+0x81b/0xac0 net/xfrm/xfrm_user.c:2977 km_query+0xc5/0x210 net/xfrm/xfrm_state.c:2023 xfrm_state_find+0x1d21/0x2d90 net/xfrm/xfrm_state.c:1042 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1410 [inline] xfrm_tmpl_resolve+0x2f3/0xc20 net/xfrm/xfrm_policy.c:1455 xfrm_resolve_and_create_bundle+0xd8/0x3e0 net/xfrm/xfrm_policy.c:1753 xfrm_lookup_with_ifid+0x232/0x1c40 net/xfrm/xfrm_policy.c:2076 xfrm_lookup net/xfrm/xfrm_policy.c:2200 [inline] xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:2211 ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1124 rawv6_sendmsg+0xc65/0x36a0 net/ipv6/raw.c:931 inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115 __sys_sendmmsg+0x195/0x470 net/socket.c:2210 __do_sys_sendmmsg net/socket.c:2239 [inline] __se_sys_sendmmsg net/socket.c:2236 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 5261: __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x7f/0x260 mm/slab.c:3765 kfree_skbmem+0xc1/0x140 net/core/skbuff.c:595 __kfree_skb net/core/skbuff.c:655 [inline] consume_skb+0x120/0x3d0 net/core/skbuff.c:714 nlmon_xmit+0xdb/0x120 drivers/net/nlmon.c:25 __netdev_start_xmit include/linux/netdevice.h:4345 [inline] netdev_start_xmit include/linux/netdevice.h:4359 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838 __netlink_deliver_tap_skb net/netlink/af_netlink.c:303 [inline] __netlink_deliver_tap net/netlink/af_netlink.c:321 [inline] netlink_deliver_tap+0x8fb/0xb00 net/netlink/af_netlink.c:334 __netlink_sendskb net/netlink/af_netlink.c:1262 [inline] netlink_broadcast_deliver net/netlink/af_netlink.c:1389 [inline] do_one_broadcast net/netlink/af_netlink.c:1474 [inline] netlink_broadcast_filtered+0x73c/0xbc0 net/netlink/af_netlink.c:1518 netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1542 nlmsg_multicast include/net/netlink.h:591 [inline] xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1091 [inline] xfrm_send_acquire+0x81b/0xac0 net/xfrm/xfrm_user.c:2977 km_query+0xc5/0x210 net/xfrm/xfrm_state.c:2023 xfrm_state_find+0x1d21/0x2d90 net/xfrm/xfrm_state.c:1042 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1410 [inline] xfrm_tmpl_resolve+0x2f3/0xc20 net/xfrm/xfrm_policy.c:1455 xfrm_resolve_and_create_bundle+0xd8/0x3e0 net/xfrm/xfrm_policy.c:1753 xfrm_lookup_with_ifid+0x232/0x1c40 net/xfrm/xfrm_policy.c:2076 xfrm_lookup net/xfrm/xfrm_policy.c:2200 [inline] xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:2211 ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1124 rawv6_sendmsg+0xc65/0x36a0 net/ipv6/raw.c:931 inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115 __sys_sendmmsg+0x195/0x470 net/socket.c:2210 __do_sys_sendmmsg net/socket.c:2239 [inline] __se_sys_sendmmsg net/socket.c:2236 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888000101080 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 0 bytes inside of 232-byte region [ffff888000101080, ffff888000101168) The buggy address belongs to the page: page:ffffea0000004040 count:1 mapcount:0 mapping:ffff8880b5b95d80 index:0x0 flags: 0x7ff00000000100(slab) raw: 007ff00000000100 ffffea0002bcb448 ffffea0002a11a08 ffff8880b5b95d80 raw: 0000000000000000 ffff888000101080 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888000100f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888000101000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888000101080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888000101100: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff888000101180: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ==================================================================