* [syzbot] [net?] KASAN: slab-use-after-free Read in ipvlan_hard_header (4)
@ 2026-06-12 13:56 syzbot
0 siblings, 0 replies; only message in thread
From: syzbot @ 2026-06-12 13:56 UTC (permalink / raw)
To: andrew+netdev, davem, edumazet, kuba, linux-kernel, netdev,
pabeni, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: bd3a4795d574 selftests: tls: add test for data loss on sma..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=17536696580000
kernel config: https://syzkaller.appspot.com/x/.config?x=4caf64b1ee83dac0
dashboard link: https://syzkaller.appspot.com/bug?extid=64ec81389cbad56a8c35
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/efddfca22ce3/disk-bd3a4795.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c9f1136a96cb/vmlinux-bd3a4795.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a69d66d7068f/bzImage-bd3a4795.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+64ec81389cbad56a8c35@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in dev_hard_header include/linux/netdevice.h:3472 [inline]
BUG: KASAN: slab-use-after-free in ipvlan_hard_header+0xa2/0x120 drivers/net/ipvlan/ipvlan_main.c:385
Read of size 8 at addr ffff88807926c010 by task syz-executor/27530
CPU: 0 UID: 0 PID: 27530 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
<IRQ>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description+0x55/0x1e0 mm/kasan/report.c:378
print_report+0x58/0x70 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
dev_hard_header include/linux/netdevice.h:3472 [inline]
ipvlan_hard_header+0xa2/0x120 drivers/net/ipvlan/ipvlan_main.c:385
dev_hard_header include/linux/netdevice.h:3475 [inline]
tipc_l2_send_msg+0x31f/0x400 net/tipc/bearer.c:514
tipc_bearer_xmit_skb+0x2b3/0x400 net/tipc/bearer.c:575
tipc_disc_timeout+0x595/0x6f0 net/tipc/discover.c:338
call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2374 [inline]
__run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386
run_timer_base kernel/time/timer.c:2395 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
handle_softirqs+0x22a/0x840 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xfcf/0x13d0 kernel/smp.c:892
Code: 79 45 8b 2e 44 89 ee 83 e6 01 31 ff e8 7a 05 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 25 01 0c 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 0a 01 0c
RSP: 0018:ffffc900052ef560 EFLAGS: 00000293
RAX: ffffffff81b9ab26 RBX: ffff8880b863c148 RCX: ffff888064b0bd80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900052ef688 R08: ffffffff9030a3f7 R09: 1ffffffff206147e
R10: dffffc0000000000 R11: fffffbfff206147f R12: 1ffff110170e8169
R13: dffffc0000000000 R14: ffff8880b8740b48 R15: 0000000000000001
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1057
__flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
flush_tlb_mm_range+0x5c3/0x10b0 arch/x86/mm/tlb.c:1451
dup_mmap+0x17a2/0x1d90 mm/mmap.c:1905
dup_mm kernel/fork.c:1534 [inline]
copy_mm+0x13b/0x4a0 kernel/fork.c:1586
copy_process+0x1f1c/0x4450 kernel/fork.c:2262
kernel_clone+0x284/0x8f0 kernel/fork.c:2723
__do_sys_clone kernel/fork.c:2864 [inline]
__se_sys_clone kernel/fork.c:2848 [inline]
__x64_sys_clone+0x1b6/0x230 kernel/fork.c:2848
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f35bc5c5852
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffc036866c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffc036866c0 RCX: 00007f35bc5c5852
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffc0368684c R08: 0000000000000000 R09: 0000000000000001
R10: 00005555868a97d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000000cc36e R15: 00007ffc036868a0
</TASK>
Allocated by task 17236:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5295 [inline]
__kvmalloc_node_noprof+0x528/0x8a0 mm/slub.c:6828
alloc_netdev_mqs+0xa8/0x1210 net/core/dev.c:12026
rtnl_create_link+0x31f/0xd70 net/core/rtnetlink.c:3672
rtnl_newlink_create+0x277/0xb70 net/core/rtnetlink.c:3854
__rtnl_newlink net/core/rtnetlink.c:3995 [inline]
rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4110
rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x75c/0x8e0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:787 [inline]
__sock_sendmsg net/socket.c:802 [inline]
__sys_sendto+0x672/0x710 net/socket.c:2265
__do_sys_sendto net/socket.c:2272 [inline]
__se_sys_sendto net/socket.c:2268 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2268
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 28096:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2689 [inline]
slab_free mm/slub.c:6246 [inline]
kfree+0x1c5/0x640 mm/slub.c:6561
device_release+0xc4/0x1f0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x228/0x560 lib/kobject.c:737
netdev_run_todo+0xc75/0xde0 net/core/dev.c:11727
rtnl_unlock net/core/rtnetlink.c:157 [inline]
rtnl_net_unlock include/linux/rtnetlink.h:135 [inline]
rtnl_dellink+0x6a7/0x820 net/core/rtnetlink.c:3602
rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x75c/0x8e0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:787 [inline]
__sock_sendmsg net/socket.c:802 [inline]
____sys_sendmsg+0x972/0x9f0 net/socket.c:2698
___sys_sendmsg+0x2a5/0x360 net/socket.c:2752
__sys_sendmsg net/socket.c:2784 [inline]
__do_sys_sendmsg net/socket.c:2789 [inline]
__se_sys_sendmsg net/socket.c:2787 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88807926c000
which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 16 bytes inside of
freed 4096-byte region [ffff88807926c000, ffff88807926d000)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79268
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88802c4dcc01
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813fe35500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800040004 00000000f5000000 ffff88802c4dcc01
head: 00fff00000000040 ffff88813fe35500 dead000000000100 dead000000000122
head: 0000000000000000 0000000800040004 00000000f5000000 ffff88802c4dcc01
head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5628, tgid 5628 (syz-executor), ts 81469147157, free_ts 54413861367
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1858
prep_new_page mm/page_alloc.c:1866 [inline]
get_page_from_freelist+0x24ba/0x2540 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226
alloc_slab_page mm/slub.c:3278 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3467
new_slab mm/slub.c:3525 [inline]
refill_objects+0x339/0x3d0 mm/slub.c:7251
refill_sheaf mm/slub.c:2816 [inline]
__pcs_replace_empty_main+0x321/0x720 mm/slub.c:4651
alloc_from_pcs mm/slub.c:4749 [inline]
slab_alloc_node mm/slub.c:4883 [inline]
__kmalloc_cache_noprof+0x392/0x660 mm/slub.c:5410
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
snmp6_alloc_dev net/ipv6/addrconf.c:362 [inline]
ipv6_add_dev+0x6aa/0x13a0 net/ipv6/addrconf.c:413
addrconf_notify+0x771/0x1050 net/ipv6/addrconf.c:3662
notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
call_netdevice_notifiers net/core/dev.c:2301 [inline]
register_netdevice+0x18c9/0x1ec0 net/core/dev.c:11458
macvlan_common_newlink+0x127c/0x19e0 drivers/net/macvlan.c:1554
rtnl_newlink_create+0x329/0xb70 net/core/rtnetlink.c:3864
__rtnl_newlink net/core/rtnetlink.c:3995 [inline]
rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4110
rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
page last free pid 5347 tgid 5347 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1402 [inline]
__free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2943
__slab_free+0x274/0x2c0 mm/slub.c:5608
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4569 [inline]
slab_alloc_node mm/slub.c:4898 [inline]
kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4905
alloc_filename fs/namei.c:142 [inline]
do_getname+0x2e/0x250 fs/namei.c:182
getname include/linux/fs.h:2526 [inline]
getname_maybe_null include/linux/fs.h:2533 [inline]
class_filename_maybe_null_constructor include/linux/fs.h:2557 [inline]
vfs_fstatat+0x45/0x170 fs/stat.c:368
__do_sys_newfstatat fs/stat.c:538 [inline]
__se_sys_newfstatat fs/stat.c:532 [inline]
__x64_sys_newfstatat+0x151/0x200 fs/stat.c:532
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88807926bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807926bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807926c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807926c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807926c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 79 45 jns 0x47
2: 8b 2e mov (%rsi),%ebp
4: 44 89 ee mov %r13d,%esi
7: 83 e6 01 and $0x1,%esi
a: 31 ff xor %edi,%edi
c: e8 7a 05 0c 00 call 0xc058b
11: 41 83 e5 01 and $0x1,%r13d
15: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
1c: fc ff df
1f: 75 07 jne 0x28
21: e8 25 01 0c 00 call 0xc014b
26: eb 37 jmp 0x5f
28: f3 90 pause
* 2a: 43 0f b6 04 2c movzbl (%r12,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 75 10 jne 0x43
33: 41 f7 06 01 00 00 00 testl $0x1,(%r14)
3a: 74 1e je 0x5a
3c: e8 .byte 0xe8
3d: 0a 01 or (%rcx),%al
3f: 0c .byte 0xc
---
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2026-06-12 13:56 [syzbot] [net?] KASAN: slab-use-after-free Read in ipvlan_hard_header (4) syzbot
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