WARNING in nf_reinject

Status: upstream: reported C repro on 2026/10/24 03:56
Reported-by: syzbot+a15ca9f3d34ed47c4522@syzkaller.appspotmail.com
First crash: 4d22h, last: 1d02h
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in nf_reinject -1 syz, C 13 8h13m 5d12h 0/3 upstream: reported C repro on 2026/10/23 14:47
linux-6.1 WARNING in nf_reinject -1 syz, C 24 8h03m 6d05h 0/3 upstream: reported C repro on 2026/10/22 20:57

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5992 at net/netfilter/nf_queue.c:329 nf_reinject+0x284/0x870 net/netfilter/nf_queue.c:-1
Modules linked in:
CPU: 0 PID: 5992 Comm: syz.0.30 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:nf_reinject+0x284/0x870 net/netfilter/nf_queue.c:329
Code: 3a e8 80 fb a6 f8 89 c3 31 ff 89 c6 e8 45 67 be f8 85 db 74 61 e8 8c 63 be f8 e9 21 01 00 00 e8 82 63 be f8 0f 0b 4c 8b 3c 24 <0f> 0b e9 98 05 00 00 e8 70 63 be f8 e9 05 01 00 00 e8 66 63 be f8
RSP: 0018:ffffc900034b6f68 EFLAGS: 00010293
RAX: ffffffff88c972b9 RBX: 0000000000000006 RCX: ffff88801c2fda00
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000006
RBP: 0000000000000000 R08: ffff88801c2fda00 R09: 0000000000000003
R10: 000000000000000a R11: 0000000000000000 R12: ffff888077a67900
R13: ffff88807db091f8 R14: ffff8880774dde00 R15: ffff8880774dde00
FS:  000055558eadb500(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000000c0 CR3: 00000000777c2000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 nfqnl_reinject net/netfilter/nfnetlink_queue.c:328 [inline]
 nfqnl_flush net/netfilter/nfnetlink_queue.c:341 [inline]
 nfqnl_nf_hook_drop+0x1ed/0x2b0 net/netfilter/nfnetlink_queue.c:1133
 nf_queue_nf_hook_drop+0x12a/0x220 net/netfilter/nf_queue.c:138
 __nf_unregister_net_hook+0x4fb/0x6d0 net/netfilter/core.c:525
 __nf_tables_unregister_hook net/netfilter/nf_tables_api.c:385 [inline]
 nf_tables_unregister_hook net/netfilter/nf_tables_api.c:392 [inline]
 nf_tables_commit+0x57a9/0x82d0 net/netfilter/nf_tables_api.c:10280
 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:569 [inline]
 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:639 [inline]
 nfnetlink_rcv+0x1ac8/0x2490 net/netfilter/nfnetlink.c:657
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x7b1/0x930 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1899
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x61b/0x980 net/socket.c:2595
 ___sys_sendmsg+0x2a6/0x360 net/socket.c:2649
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2687 [inline]
 __se_sys_sendmsg+0x1d0/0x2c0 net/socket.c:2685
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0e0139f559
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:00007ffe53df8eb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f0e01625fa0 RCX: 00007f0e0139f559
RDX: 0000000024040008 RSI: 0000200000000380 RDI: 0000000000000004
RBP: 00007f0e01436b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0e01625fac R14: 00007f0e01625fa0 R15: 00007f0e01625fa0
 </TASK>

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/24 07:56 linux-6.6.y 0aebf2870d53 1d9ca40b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nf_reinject
2026/10/28 00:20 linux-6.6.y 0aebf2870d53 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nf_reinject
2026/10/28 00:03 linux-6.6.y 0aebf2870d53 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nf_reinject
2026/10/28 00:03 linux-6.6.y 0aebf2870d53 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nf_reinject
2026/10/27 10:56 linux-6.6.y 0aebf2870d53 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nf_reinject
2026/10/27 10:56 linux-6.6.y 0aebf2870d53 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nf_reinject
2026/10/27 10:50 linux-6.6.y 0aebf2870d53 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nf_reinject
2026/10/24 03:56 linux-6.6.y 0aebf2870d53 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in nf_reinject
* Struck through repros no longer work on HEAD.