KASAN: use-after-free Read in ip6_pol

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: use-after-free Read in ip6_pol_route	19				249	3019d	3028d	3/29	fixed on 2017/10/24 06:54
upstream	KASAN: use-after-free Read in ip6_pol_route (2) net	19	C	done	unreliable	9	1307d	1742d	0/29	auto-obsoleted due to no activity on 2022/09/19 15:39
android-6-12	general protection fault in ip6_pol_route	2				1	17d	17d	0/1	premoderation: reported on 2025/11/10 08:09
upstream	general protection fault in ip6_pol_route (2) net	8				15	520d	527d	0/29	auto-obsoleted due to no activity on 2024/08/28 04:33
upstream	Internal error in ip6_pol_route net	2				2	748d	771d	0/29	auto-obsoleted due to no activity on 2024/02/18 23:43
upstream	general protection fault in ip6_pol_route net	8				73	528d	566d	26/29	fixed on 2024/06/18 11:11
upstream	general protection fault in ip6_pol_route (3) net	8	syz	error		25	169d	296d	0/29	auto-obsoleted due to no activity on 2025/09/19 08:31

================================================================== BUG: KASAN: use-after-free in rt6_get_pcpu_route net/ipv6/route.c:1396 [inline] BUG: KASAN: use-after-free in ip6_pol_route+0x1331/0x15a0 net/ipv6/route.c:2255 Read of size 4 at addr ffff888022b7aa78 by task kworker/0:11/3827 CPU: 0 PID: 3827 Comm: kworker/0:11 Not tainted 5.15.152-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Workqueue: wg-crypt-wg0 wg_packet_tx_worker Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 rt6_get_pcpu_route net/ipv6/route.c:1396 [inline] ip6_pol_route+0x1331/0x15a0 net/ipv6/route.c:2255 pol_lookup_func include/net/ip6_fib.h:582 [inline] fib6_rule_lookup+0x265/0x620 net/ipv6/fib6_rules.c:115 ip6_route_output_flags+0xc1/0x310 net/ipv6/route.c:2642 ip6_dst_lookup_tail+0x267/0x11a0 net/ipv6/ip6_output.c:1121 ip6_dst_lookup_flow+0xb5/0x170 net/ipv6/ip6_output.c:1224 send6+0x5a7/0xad0 drivers/net/wireguard/socket.c:139 wg_socket_send_skb_to_peer+0x111/0x1d0 drivers/net/wireguard/socket.c:178 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x1a1/0x7a0 drivers/net/wireguard/send.c:276 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 </TASK> Allocated by task 3839: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233 dst_alloc+0x12c/0x190 net/core/dst.c:88 ip6_dst_alloc net/ipv6/route.c:341 [inline] ip6_rt_pcpu_alloc net/ipv6/route.c:1369 [inline] rt6_make_pcpu_route net/ipv6/route.c:1417 [inline] ip6_pol_route+0xbe2/0x15a0 net/ipv6/route.c:2258 pol_lookup_func include/net/ip6_fib.h:582 [inline] fib6_rule_lookup+0x265/0x620 net/ipv6/fib6_rules.c:115 ip6_route_output_flags+0xc1/0x310 net/ipv6/route.c:2642 ip6_route_output include/net/ip6_route.h:98 [inline] ip6_dst_lookup_tail+0x19c/0x11a0 net/ipv6/ip6_output.c:1094 ip6_dst_lookup_flow+0xb5/0x170 net/ipv6/ip6_output.c:1224 send6+0x5a7/0xad0 drivers/net/wireguard/socket.c:139 wg_socket_send_skb_to_peer+0x111/0x1d0 drivers/net/wireguard/socket.c:178 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline] wg_packet_handshake_send_worker+0x1d9/0x310 drivers/net/wireguard/send.c:51 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Freed by task 14: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0x91/0x1f0 mm/slub.c:3515 dst_destroy+0x28e/0x380 net/core/dst.c:123 rcu_do_batch kernel/rcu/tree.c:2523 [inline] rcu_core+0xa15/0x1650 kernel/rcu/tree.c:2763 __do_softirq+0x3b3/0x93a kernel/softirq.c:558 Last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087 dst_cache_per_cpu_get+0x2a6/0x340 net/core/dst_cache.c:53 dst_cache_get_ip6+0x88/0xe0 net/core/dst_cache.c:130 send6+0x416/0xad0 drivers/net/wireguard/socket.c:129 wg_socket_send_skb_to_peer+0x111/0x1d0 drivers/net/wireguard/socket.c:178 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x1a1/0x7a0 drivers/net/wireguard/send.c:276 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Second to last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087 refdst_drop include/net/dst.h:255 [inline] skb_dst_drop include/net/dst.h:267 [inline] __dev_queue_xmit+0x7a2/0x3230 net/core/dev.c:4204 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0xee8/0x14f0 net/ipv6/ip6_output.c:126 dst_output include/net/dst.h:443 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ndisc_send_skb+0xae0/0x13c0 net/ipv6/ndisc.c:509 ndisc_send_ns+0x64d/0x830 net/ipv6/ndisc.c:651 addrconf_dad_work+0xb35/0x1720 net/ipv6/addrconf.c:4199 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff888022b7aa00 which belongs to the cache ip6_dst_cache of size 232 The buggy address is located 120 bytes inside of 232-byte region [ffff888022b7aa00, ffff888022b7aae8) The buggy address belongs to the page: page:ffffea00008ade80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22b7a memcg:ffff88805db0c581 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff8880236b0140 raw: 0000000000000000 00000000000c000c 00000001ffffffff ffff88805db0c581 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 3558, ts 65089726373, free_ts 65076930277 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159 __alloc_pages+0x272/0x700 mm/page_alloc.c:5421 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x18e/0x280 mm/slub.c:3233 dst_alloc+0x12c/0x190 net/core/dst.c:88 ip6_dst_alloc net/ipv6/route.c:341 [inline] icmp6_dst_alloc+0x76/0x4f0 net/ipv6/route.c:3271 mld_sendpack+0x584/0xc10 net/ipv6/mcast.c:1809 mld_send_cr net/ipv6/mcast.c:2121 [inline] mld_ifc_work+0x7d7/0xc90 net/ipv6/mcast.c:2653 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 free_slab mm/slub.c:2015 [inline] discard_slab mm/slub.c:2021 [inline] __unfreeze_partials+0x1b7/0x210 mm/slub.c:2507 put_cpu_partial+0x132/0x1a0 mm/slub.c:2587 do_slab_free mm/slub.c:3487 [inline] ___cache_free+0xe3/0x100 mm/slub.c:3506 qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0xfb/0x290 mm/slub.c:3245 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] tomoyo_dump_page+0x115/0x660 security/tomoyo/domain.c:906 tomoyo_scan_bprm security/tomoyo/condition.c:130 [inline] tomoyo_condition+0x1d83/0x2c00 security/tomoyo/condition.c:1120 tomoyo_check_acl+0x168/0x410 security/tomoyo/domain.c:177 tomoyo_execute_permission+0x139/0x410 security/tomoyo/file.c:615 tomoyo_find_next_domain+0x3ff/0x1cf0 security/tomoyo/domain.c:752 tomoyo_bprm_check_security+0xdb/0x120 security/tomoyo/tomoyo.c:101 Memory state around the buggy address: ffff888022b7a900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888022b7a980: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc >ffff888022b7aa00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888022b7aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff888022b7ab00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2024/03/26 16:13	linux-5.15.y	b95c01af2113	bcd9b39f	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	KASAN: use-after-free Read in ip6_pol_route

Crashes (1):

Assets (help?)