================================================================== BUG: KFENCE: use-after-free read in __xfrm_state_lookup_all net/xfrm/xfrm_state.c:-1 [inline] BUG: KFENCE: use-after-free read in xfrm_state_find+0x279a/0x53e0 net/xfrm/xfrm_state.c:1494 Use-after-free read at 0xffff88823becaf70 (in kfence-#100): __xfrm_state_lookup_all net/xfrm/xfrm_state.c:-1 [inline] xfrm_state_find+0x279a/0x53e0 net/xfrm/xfrm_state.c:1494 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2522 [inline] xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2573 [inline] xfrm_resolve_and_create_bundle+0x768/0x2f80 net/xfrm/xfrm_policy.c:2871 xfrm_lookup_with_ifid+0x2a7/0x1a90 net/xfrm/xfrm_policy.c:3205 xfrm_lookup net/xfrm/xfrm_policy.c:3336 [inline] xfrm_lookup_route+0x3c/0x1c0 net/xfrm/xfrm_policy.c:3347 rawv6_sendmsg+0xdab/0x1820 net/ipv6/raw.c:893 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x19c/0x270 net/socket.c:729 ____sys_sendmsg+0x534/0x820 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmmsg+0x22d/0x430 net/socket.c:2757 __do_sys_sendmmsg net/socket.c:2784 [inline] __se_sys_sendmmsg net/socket.c:2781 [inline] __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2781 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f kfence-#100: 0xffff88823becaf00-0xffff88823becafef, size=240, cache=skbuff_head_cache allocated by task 57 on cpu 1 at 604.789755s (3.855660s ago): __alloc_skb+0x112/0x2d0 net/core/skbuff.c:659 alloc_skb include/linux/skbuff.h:1336 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:763 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline] nsim_dev_trap_report_work+0x29f/0xbc0 drivers/net/netdevsim/dev.c:866 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 freed by task 57 on cpu 1 at 604.789870s (3.855760s ago): nsim_dev_trap_report drivers/net/netdevsim/dev.c:836 [inline] nsim_dev_trap_report_work+0x7fa/0xbc0 drivers/net/netdevsim/dev.c:866 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 CPU: 1 UID: 0 PID: 9587 Comm: syz.1.948 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__xfrm_state_lookup_all net/xfrm/xfrm_state.c:-1 [inline] RIP: 0010:xfrm_state_find+0x279a/0x53e0 net/xfrm/xfrm_state.c:1494 Code: 83 e5 0c bf 08 00 00 00 44 89 ee e8 d0 91 20 f8 4d 8d a6 70 03 00 00 4c 89 e0 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 c2 04 00 00 <45> 0f b6 24 24 41 83 e4 0c bf 08 00 00 00 44 89 e6 e8 a0 91 20 f8 RSP: 0018:ffffc9000488ef00 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff888026259dc0 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000008 RBP: ffffc9000488f120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 000000000000000a R12: ffff88823becaf70 R13: 0000000000000000 R14: ffff88823becac00 R15: 1ffff1100cbd445a FS: 00007fedf06746c0(0000) GS:ffff8881269bf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823becaf70 CR3: 00000000520c8000 CR4: 00000000003526f0 Call Trace: xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2522 [inline] xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2573 [inline] xfrm_resolve_and_create_bundle+0x768/0x2f80 net/xfrm/xfrm_policy.c:2871 xfrm_lookup_with_ifid+0x2a7/0x1a90 net/xfrm/xfrm_policy.c:3205 xfrm_lookup net/xfrm/xfrm_policy.c:3336 [inline] xfrm_lookup_route+0x3c/0x1c0 net/xfrm/xfrm_policy.c:3347 rawv6_sendmsg+0xdab/0x1820 net/ipv6/raw.c:893 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x19c/0x270 net/socket.c:729 ____sys_sendmsg+0x534/0x820 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmmsg+0x22d/0x430 net/socket.c:2757 __do_sys_sendmmsg net/socket.c:2784 [inline] __se_sys_sendmmsg net/socket.c:2781 [inline] __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2781 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fedf244ebe9 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:00007fedf0674038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fedf2686180 RCX: 00007fedf244ebe9 RDX: 0000000000000021 RSI: 0000200000000480 RDI: 0000000000000006 RBP: 00007fedf24d1e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fedf2686218 R14: 00007fedf2686180 R15: 00007fff14a9f738 ================================================================== ---------------- Code disassembly (best guess): 0: 83 e5 0c and $0xc,%ebp 3: bf 08 00 00 00 mov $0x8,%edi 8: 44 89 ee mov %r13d,%esi b: e8 d0 91 20 f8 call 0xf82091e0 10: 4d 8d a6 70 03 00 00 lea 0x370(%r14),%r12 17: 4c 89 e0 mov %r12,%rax 1a: 48 c1 e8 03 shr $0x3,%rax 1e: 0f b6 04 18 movzbl (%rax,%rbx,1),%eax 22: 84 c0 test %al,%al 24: 0f 85 c2 04 00 00 jne 0x4ec * 2a: 45 0f b6 24 24 movzbl (%r12),%r12d <-- trapping instruction 2f: 41 83 e4 0c and $0xc,%r12d 33: bf 08 00 00 00 mov $0x8,%edi 38: 44 89 e6 mov %r12d,%esi 3b: e8 a0 91 20 f8 call 0xf82091e0