==================================================================
BUG: KFENCE: use-after-free read in xfrm_state_lookup_spi_proto net/xfrm/xfrm_state.c:1477 [inline]
BUG: KFENCE: use-after-free read in xfrm_alloc_spi+0x3c9/0x11f0 net/xfrm/xfrm_state.c:2302

Use-after-free read at 0xffff88823bd920a0 (in kfence-#200):
 xfrm_state_lookup_spi_proto net/xfrm/xfrm_state.c:1477 [inline]
 xfrm_alloc_spi+0x3c9/0x11f0 net/xfrm/xfrm_state.c:2302
 pfkey_getspi+0x79a/0xed0 net/key/af_key.c:1385
 pfkey_process net/key/af_key.c:2847 [inline]
 pfkey_sendmsg+0xbed/0x1050 net/key/af_key.c:3698
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
 ___sys_sendmsg+0x220/0x290 net/socket.c:2649
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2687 [inline]
 __se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

kfence-#200: 0xffff88823bd92000-0xffff88823bd92fff, size=4096, cache=names_cache

allocated by task 5157 on cpu 1 at 257.237545s:
 getname_flags+0xbb/0x500 fs/namei.c:140
 vfs_fstatat+0x111/0x1b0 fs/stat.c:298
 __do_sys_newfstatat fs/stat.c:463 [inline]
 __se_sys_newfstatat fs/stat.c:457 [inline]
 __x64_sys_newfstatat+0x117/0x190 fs/stat.c:457
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

freed by task 5157 on cpu 1 at 257.237619s:
 vfs_fstatat+0x134/0x1b0 fs/stat.c:300
 __do_sys_newfstatat fs/stat.c:463 [inline]
 __se_sys_newfstatat fs/stat.c:457 [inline]
 __x64_sys_newfstatat+0x117/0x190 fs/stat.c:457
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

CPU: 1 PID: 13472 Comm: syz.1.3186 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:xfrm_state_lookup_spi_proto net/xfrm/xfrm_state.c:1477 [inline]
RIP: 0010:xfrm_alloc_spi+0x3c9/0x11f0 net/xfrm/xfrm_state.c:2302
Code: c1 08 c1 74 0a e8 07 5f 67 f8 e9 2d 02 00 00 4d 8d a6 a0 00 00 00 4c 89 e0 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 b6 01 00 00 <45> 8b 24 24 44 89 e7 89 de e8 59 60 67 f8 41 39 dc 0f 85 eb 00 00
RSP: 0018:ffffc9000c3bf600 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000eaa3a801 RCX: 0000000000080000
RDX: ffffc9000d5aa000 RSI: 00000000000006ae RDI: 00000000000006af
RBP: ffffc9000c3bf758 R08: dffffc0000000000 R09: 1ffffffff21b4aa0
R10: dffffc0000000000 R11: fffffbfff21b4aa1 R12: ffff88823bd920a0
R13: 0000000000000100 R14: ffff88823bd92000 R15: dffffc0000000000
FS:  00007ff7173c56c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823bd920a0 CR3: 000000002e432000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 pfkey_getspi+0x79a/0xed0 net/key/af_key.c:1385
 pfkey_process net/key/af_key.c:2847 [inline]
 pfkey_sendmsg+0xbed/0x1050 net/key/af_key.c:3698
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
 ___sys_sendmsg+0x220/0x290 net/socket.c:2649
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2687 [inline]
 __se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff71658ebe9
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:00007ff7173c5038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff7167b5fa0 RCX: 00007ff71658ebe9
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007ff716611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff7167b6038 R14: 00007ff7167b5fa0 R15: 00007fff0e6af3e8
 </TASK>
==================================================================
----------------
Code disassembly (best guess):
   0:	c1 08 c1             	rorl   $0xc1,(%rax)
   3:	74 0a                	je     0xf
   5:	e8 07 5f 67 f8       	call   0xf8675f11
   a:	e9 2d 02 00 00       	jmp    0x23c
   f:	4d 8d a6 a0 00 00 00 	lea    0xa0(%r14),%r12
  16:	4c 89 e0             	mov    %r12,%rax
  19:	48 c1 e8 03          	shr    $0x3,%rax
  1d:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax
  22:	84 c0                	test   %al,%al
  24:	0f 85 b6 01 00 00    	jne    0x1e0
* 2a:	45 8b 24 24          	mov    (%r12),%r12d <-- trapping instruction
  2e:	44 89 e7             	mov    %r12d,%edi
  31:	89 de                	mov    %ebx,%esi
  33:	e8 59 60 67 f8       	call   0xf8676091
  38:	41 39 dc             	cmp    %ebx,%r12d
  3b:	0f                   	.byte 0xf
  3c:	85 eb                	test   %ebp,%ebx