WARNING in cfg80211_rehash_bss

Status: upstream: reported C repro on 2025/08/13 21:57
Subsystems: wireless
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+dc6f4dce0d707900cdea@syzkaller.appspotmail.com
Fix commit: b377e1000d96 wifi: cfg80211: don't filter by BSS type when removing stale entries
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu-native-arm64-kvm ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root]
First crash: 448d, last: 226d
▶ ▼ ✨ AI Patch Versions (5)
Version Stage Reported Report Link Job
1 upstream 2026/08/05 20:35 Discussion 3e1a2f1d-82c9-492d-8063-7fb21356c013
3 moderation 2026/08/05 09:26 Discussion 3e1a2f1d-82c9-492d-8063-7fb21356c013
2 moderation 2026/08/04 13:45 Discussion 075be109-44b2-42f2-89a0-050bc51d2a19
1 moderation 2026/08/02 22:23 Discussion 36735ba4-a810-4748-9be0-c030fc138df1
1 moderation 2026/05/18 16:05 Discussion e5a87dde-cabd-43cb-9698-500d937ec9f6
▶ ▼ ✨ AI Jobs (7)
ID Workflow Result Correct Bug Created Started Finished Revision
3e1a2f1d patch-iteration ✅ WARNING in cfg80211_rehash_bss 2026/08/05 08:29 2026/08/05 08:29 2026/08/05 09:26 52aa2820
075be109 patch-iteration ❓ WARNING in cfg80211_rehash_bss 2026/08/04 12:44 2026/08/04 12:44 2026/08/04 13:45 9451e17e
36735ba4 patching ❓ WARNING in cfg80211_rehash_bss 2026/08/02 19:16 2026/08/02 21:09 2026/08/02 22:23 e611ffe1
1e948072 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ✅ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in cfg80211_rehash_bss 2026/05/30 08:46 2026/05/30 08:46 2026/05/30 09:49 6b4a8443
e5a87dde patching-compressed ❓ WARNING in cfg80211_rehash_bss 2026/05/18 13:05 2026/05/18 13:05 2026/05/18 16:05 d77e9432
97ef9865 patching-compressed 💥 WARNING in cfg80211_rehash_bss 2026/05/15 21:20 2026/05/15 21:42 2026/05/15 21:42 efdaf0f9
5d25c453 assessment-security 💥 WARNING in cfg80211_rehash_bss 2026/05/14 09:12 2026/05/14 09:12 2026/05/14 09:12 6ccb967e
▶ ▼ Discussions (5)
Title Replies (including bot) Last reply
[PATCH wireless 5/8] wifi: cfg80211: don't filter by BSS type when removing stale entries 1 (1) 2026/09/04 14:55
[PATCH] wifi: cfg80211: fix BSS RB tree collision during channel switch 1 (1) 2026/08/05 20:35
[syzbot] [wireless?] WARNING in cfg80211_rehash_bss 0 (2) 2025/09/16 08:54
Re: [PATCH v2 RFC 0/7] KFuzzTest: a new kernel fuzzing framework 1 (1) 2025/09/10 15:59
Re: [PATCH] wifi: cfg80211: fix bss rbn double erase issue 1 (1) 2025/09/05 08:11
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2026/08/06 23:19 22m retest repro upstream error
2026/05/28 22:46 23m retest repro upstream error
2026/03/19 22:01 17m retest repro upstream report log
2026/01/05 17:04 20m retest repro upstream no crash log
2025/10/02 22:44 14m retest repro upstream report log

Sample crash report:
------------[ cut here ]------------
!cmp
WARNING: net/wireless/scan.c:1665 at rb_insert_bss net/wireless/scan.c:1665 [inline], CPU#0: kworker/u4:2/30
WARNING: net/wireless/scan.c:1665 at cfg80211_rehash_bss+0x1e6/0x540 net/wireless/scan.c:1722, CPU#0: kworker/u4:2/30
Modules linked in:
CPU: 0 UID: 0 PID: 30 Comm: kworker/u4:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:rb_insert_bss net/wireless/scan.c:1665 [inline]
RIP: 0010:cfg80211_rehash_bss+0x1e6/0x540 net/wireless/scan.c:1722
Code: e8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 33 03 00 00 ff 45 00 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 90 <0f> 0b 90 4c 8b 2c 24 4c 89 ef e8 bb 69 bd f9 84 c0 74 78 e8 a2 1c
RSP: 0018:ffffc90000386fa0 EFLAGS: 00010246
RAX: ffffffff8afc7db5 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801eeb2480 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88801254bc68 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000000 R12: ffff8880339881a0
R13: ffff88801191b030 R14: dffffc0000000000 R15: ffff88801a887020
FS:  0000000000000000(0000) GS:ffff88808ca58000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c004cee000 CR3: 0000000012567000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 cfg80211_update_assoc_bss_entry+0x3fa/0x6a0 net/wireless/scan.c:3462
 cfg80211_ch_switch_notify+0x3c1/0x7c0 net/wireless/nl80211.c:21096
 ieee80211_sta_process_chanswitch+0xbba/0x2940 net/mac80211/mlme.c:-1
 ieee80211_rx_mgmt_beacon+0x1e93/0x3350 net/mac80211/mlme.c:7715
 ieee80211_sta_rx_queued_mgmt+0x53e/0x4740 net/mac80211/mlme.c:8288
 ieee80211_iface_process_skb net/mac80211/iface.c:1745 [inline]
 ieee80211_iface_work+0x64b/0x1340 net/mac80211/iface.c:1802
 cfg80211_wiphy_work+0x2ab/0x4a0 net/wireless/core.c:440
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/02 08:22 upstream 39c633261414 43249bac .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2026/03/05 21:38 upstream c107785c7e8d d20b04c8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2026/03/02 06:19 upstream 39c633261414 43249bac .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2026/02/10 09:38 upstream 8a5203c630c6 4ab09a02 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/12/22 17:03 upstream 9448598b22c5 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/12/12 02:16 upstream d358e5254674 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/12/06 23:12 upstream 416f99c3b16f d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/12/04 03:21 upstream 3f9f0252130e d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/11/02 19:08 upstream 691d401c7e0e 2c50b6a9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/10/29 23:37 upstream e53642b87a4f fd2207e7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/09/18 22:08 upstream 8b789f2b7602 e2beed91 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/09/16 08:53 upstream 46a51f4f5eda e2beed91 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/09/16 07:05 upstream 46a51f4f5eda e2beed91 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/08/19 02:37 upstream be48bcf004f9 52052143 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/08/09 21:47 upstream c30a13538d9f 32a0e5ed .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
* Struck through repros no longer work on HEAD.