WARNING in cfg80211_cac_event

Status: upstream: reported on 2026/10/26 01:32
Subsystems: wireless
[Documentation on labels]
Reported-by: syzbot+3df76a08d929e91e5327@syzkaller.appspotmail.com
First crash: 4d06h, last: 2d01h
▶ ▼ ✨ AI Jobs (3)
ID Workflow Result Correct Bug Created Started Finished Revision
687dcdbc repro-c 💥 WARNING in cfg80211_cac_event 2026/10/26 06:46 2026/10/26 06:46 2026/10/26 07:41 1d9ca40b
5e3402a0 repro-c 💥 WARNING in cfg80211_cac_event 2026/10/24 18:22 2026/10/24 18:22 2026/10/25 04:07 1d9ca40b
5c919e47 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ FuzzingArtifact: ❌ MemoryCorruption: ❌ NetworkNeedsSetup: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in cfg80211_cac_event 2026/10/23 03:14 2026/10/23 03:14 2026/10/23 04:03 33f73a1b
▶ ▼ Discussions (1)
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[syzbot] [wireless?] WARNING in cfg80211_cac_event 0 (1) 2026/10/26 01:32

Sample crash report:
------------[ cut here ]------------
!time_after_eq(jiffies, timeout)
WARNING: net/wireless/mlme.c:1309 at cfg80211_cac_event+0x45b/0x6e0 net/wireless/mlme.c:1309, CPU#1: kworker/u8:3/2120
Modules linked in:
CPU: 1 UID: 0 PID: 2120 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:cfg80211_cac_event+0x45b/0x6e0 net/wireless/mlme.c:1309
Code: fc ff ff e8 67 a8 7d f6 90 0f 0b 90 eb c8 e8 5c a8 7d f6 48 8d 3d 85 18 43 06 67 48 0f b9 3a e9 35 fd ff ff e8 46 a8 7d f6 90 <0f> 0b 90 e9 82 fe ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c 24 fc ff
RSP: 0000:ffffc9000328f918 EFLAGS: 00010293
RAX: ffffffff8b4abdda RBX: 0000000100010317 RCX: ffff888031c13e80
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000
RBP: 0000000100011a86 R08: ffff888031c13e80 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880569213e8
R13: dffffc0000000000 R14: 0000000100011a87 R15: 1ffff1100ad2427d
FS:  0000000000000000(0000) GS:ffff888123b6b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd8c6a5cdc CR3: 000000007562a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ieee80211_dfs_cac_timer_work+0x264/0x380 net/mac80211/mlme.c:3995
 cfg80211_wiphy_work+0x29e/0x420 net/wireless/core.c:610
 process_one_work kernel/workqueue.c:3495 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
 kthread+0x38b/0x480 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>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/24 06:42 net-next 734bef548a96 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in cfg80211_cac_event
2026/10/22 01:27 net-next 279d5c8afcd3 61c200c7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in cfg80211_cac_event
* Struck through repros no longer work on HEAD.