BUG: corrupted list in _cfg80211_unregister_wdev

Status: moderation: reported on 2026/08/22 00:11
Subsystems: wireless
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+c5f8a81e794d4a4f2014@syzkaller.appspotmail.com
First crash: 8d08h, last: 8d08h
✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
df48cd51 repro-c Reproduced: ✅ BUG: corrupted list in _cfg80211_unregister_wdev 2026/08/25 14:13 2026/08/25 14:13 2026/08/25 17:32 ee98d2fd
5837897e assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ BUG: corrupted list in _cfg80211_unregister_wdev 2026/08/19 01:32 2026/08/19 01:32 2026/08/19 02:30 1e72964b

Sample crash report:
 non-paged memory
list_del corruption, ffff88802574cee0->prev is LIST_POISON2 (dead000000000122)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:61!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 9234 Comm: kworker/u8:18 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: netns cleanup_net
RIP: 0010:__list_del_entry_valid_or_report+0x12b/0x190 lib/list_debug.c:59
Code: 8c 48 89 de 4c 89 e2 e8 33 23 49 fc 90 0f 0b 4c 89 e7 e8 68 25 34 fd 48 c7 c7 e0 c2 4b 8c 48 89 de 4c 89 e2 e8 16 23 49 fc 90 <0f> 0b 4c 89 ff e8 4b 25 34 fd 43 80 3c 2c 00 74 08 4c 89 ff e8 7c
RSP: 0018:ffffc9001b617608 EFLAGS: 00010246
RAX: 000000000000004e RBX: ffff88802574cee0 RCX: ae6a1cd7a5878c00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffc9001b617387 R09: 1ffff920036c2e70
R10: dffffc0000000000 R11: fffff520036c2e71 R12: dead000000000122
R13: dffffc0000000000 R14: ffff88805b7d0e10 R15: dead000000000122
FS:  0000000000000000(0000) GS:ffff888124f49000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1122ce6028 CR3: 000000002c70c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:246 [inline]
 list_del_rcu include/linux/rculist.h:178 [inline]
 _cfg80211_unregister_wdev+0x170/0x5a0 net/wireless/core.c:1425
 ieee80211_remove_interfaces+0x49c/0x6a0 net/mac80211/iface.c:2492
 ieee80211_unregister_hw+0x5d/0x2c0 net/mac80211/main.c:1718
 mac80211_hwsim_del_radio+0x28a/0x4a0 drivers/net/wireless/virtual/mac80211_hwsim_main.c:6226
 hwsim_exit_net+0xe8e/0xf50 drivers/net/wireless/virtual/mac80211_hwsim_main.c:7207
 ops_exit_list net/core/net_namespace.c:199 [inline]
 ops_undo_list+0x43d/0x8d0 net/core/net_namespace.c:252
 cleanup_net+0x572/0x810 net/core/net_namespace.c:702
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x12b/0x190 lib/list_debug.c:59
Code: 8c 48 89 de 4c 89 e2 e8 33 23 49 fc 90 0f 0b 4c 89 e7 e8 68 25 34 fd 48 c7 c7 e0 c2 4b 8c 48 89 de 4c 89 e2 e8 16 23 49 fc 90 <0f> 0b 4c 89 ff e8 4b 25 34 fd 43 80 3c 2c 00 74 08 4c 89 ff e8 7c
RSP: 0018:ffffc9001b617608 EFLAGS: 00010246
RAX: 000000000000004e RBX: ffff88802574cee0 RCX: ae6a1cd7a5878c00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffc9001b617387 R09: 1ffff920036c2e70
R10: dffffc0000000000 R11: fffff520036c2e71 R12: dead000000000122
R13: dffffc0000000000 R14: ffff88805b7d0e10 R15: dead000000000122
FS:  0000000000000000(0000) GS:ffff888124f49000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007f564000 CR4: 00000000003526f0

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/17 19:19 upstream 8d3ae59288f1 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce BUG: corrupted list in _cfg80211_unregister_wdev
* Struck through repros no longer work on HEAD.