WARNING in cfg80211_bss_update

Status: upstream: reported on 2026/09/22 13:14
Reported-by: syzbot+e637ed85a59747cf2b5c@syzkaller.appspotmail.com
First crash: 2d07h, last: 2d03h
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in cfg80211_bss_update (3) wireless -1 1 1256d 1252d 0/29 auto-obsoleted due to no activity on 2023/08/15 12:15
linux-6.1 WARNING in cfg80211_bss_update origin:upstream -1 syz, C error 13 2d05h 269d 0/3 upstream: reported C repro on 2025/12/29 19:57
upstream WARNING in cfg80211_bss_update wireless -1 1 2076d 2074d 0/29 auto-closed as invalid on 2021/05/17 12:37
upstream WARNING in cfg80211_bss_update (2) wireless -1 2 1740d 1823d 0/29 auto-closed as invalid on 2022/04/18 00:39

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3052 at net/wireless/scan.c:520 cfg80211_bss_expire_oldest net/wireless/scan.c:520 [inline]
WARNING: CPU: 1 PID: 3052 at net/wireless/scan.c:520 cfg80211_bss_update+0x2196/0x21a0 net/wireless/scan.c:1891
Modules linked in:
CPU: 1 PID: 3052 Comm: kworker/u4:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:cfg80211_bss_expire_oldest net/wireless/scan.c:520 [inline]
RIP: 0010:cfg80211_bss_update+0x2196/0x21a0 net/wireless/scan.c:1891
Code: c7 c1 84 52 8b 8d 80 e1 07 80 c1 03 38 c1 0f 8c 5c fc ff ff 48 c7 c7 84 52 8b 8d e8 44 fa 8d f8 e9 4b fc ff ff e8 8a c6 48 f8 <0f> 0b e9 a0 fc ff ff 0f 1f 00 55 41 57 41 56 41 55 41 54 53 48 83
RSP: 0018:ffffc9000d0e7450 EFLAGS: 00010283
RAX: ffffffff89304e16 RBX: ffff888078ce8190 RCX: 0000000000100000
RDX: ffffc900137e1000 RSI: 0000000000000049 RDI: 000000000000004a
RBP: dffffc0000000000 R08: ffff888079153853 R09: 1ffff1100f22a70a
R10: dffffc0000000000 R11: ffffed100f22a70b R12: 0000000000000001
R13: ffff888078ce8190 R14: ffff888078e38400 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f93ca79a7b0 CR3: 000000007d543000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2552 [inline]
 cfg80211_inform_bss_frame_data+0x88d/0x1ed0 net/wireless/scan.c:2585
 ieee80211_bss_info_update+0x6ba/0xa80 net/mac80211/scan.c:190
 ieee80211_rx_bss_info net/mac80211/ibss.c:1123 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1614 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x1763/0x2b50 net/mac80211/ibss.c:1643
 ieee80211_iface_process_skb net/mac80211/iface.c:1465 [inline]
 ieee80211_iface_work+0x714/0xc50 net/mac80211/iface.c:1519
 cfg80211_wiphy_work+0x224/0x260 net/wireless/core.c:433
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/22 17:06 linux-5.15.y 0248c33e835e e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in cfg80211_bss_update
2026/09/22 17:05 linux-5.15.y 0248c33e835e e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in cfg80211_bss_update
2026/09/22 13:14 linux-5.15.y 0248c33e835e e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in cfg80211_bss_update
2026/09/22 13:13 linux-5.15.y 0248c33e835e e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in cfg80211_bss_update
* Struck through repros no longer work on HEAD.