WARNING in nl80211_set_tx_bitrate_mask

Status: upstream: reported on 2026/07/24 21:56
Subsystems: wireless
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+dcaca020ca8377e7ced0@syzkaller.appspotmail.com
First crash: 11d, last: 4d06h
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
2c474005 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in nl80211_set_tx_bitrate_mask 2026/07/22 00:00 2026/07/22 00:00 2026/07/22 01:04 0d5a7c31

			
		
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [wireless?] WARNING in nl80211_set_tx_bitrate_mask 0 (1) 2026/07/24 21:56

Sample crash report:
------------[ cut here ]------------
wlan0: Failed check-sdata-in-driver check, flags: 0x0
WARNING: net/mac80211/driver-ops.h:884 at drv_set_bitrate_mask net/mac80211/driver-ops.h:884 [inline], CPU#1: syz.3.2120/12933
WARNING: net/mac80211/driver-ops.h:884 at ieee80211_set_bitrate_mask+0x1034/0x1320 net/mac80211/cfg.c:4134, CPU#1: syz.3.2120/12933
Modules linked in:
CPU: 1 UID: 0 PID: 12933 Comm: syz.3.2120 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:drv_set_bitrate_mask net/mac80211/driver-ops.h:884 [inline]
RIP: 0010:ieee80211_set_bitrate_mask+0x1084/0x1320 net/mac80211/cfg.c:4134
Code: 20 01 00 00 48 85 c0 49 0f 44 ee 48 b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 0f 85 3b 01 00 00 41 8b 17 4c 89 ef 48 89 ee <67> 48 0f b9 3a e9 c3 fd ff ff e8 0d 15 82 f6 90 0f 0b 90 e9 41 fe
RSP: 0018:ffffc90006356ff8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff1100f4acb25 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffff88807a564120 RDI: ffffffff9069c2c0
RBP: ffff88807a564120 R08: ffff88806b050faf R09: 1ffff1100d60a1f5
R10: dffffc0000000000 R11: ffffed100d60a1f6 R12: ffff88806b050740
R13: ffffffff9069c2c0 R14: ffff88807a565938 R15: ffff88807a565928
FS:  00007fd8ec5e56c0(0000) GS:ffff888125050000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c337921 CR3: 000000005ab48000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rdev_set_bitrate_mask net/wireless/rdev-ops.h:683 [inline]
 nl80211_set_tx_bitrate_mask+0x30b/0x4f0 net/wireless/nl80211.c:14541
 genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775
 __sock_sendmsg net/socket.c:790 [inline]
 ____sys_sendmsg+0x54e/0x850 net/socket.c:2684
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2738
 __sys_sendmsg net/socket.c:2770 [inline]
 __do_sys_sendmsg net/socket.c:2775 [inline]
 __se_sys_sendmsg net/socket.c:2773 [inline]
 __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2773
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd8eb79de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd8ec5e5028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd8eba26180 RCX: 00007fd8eb79de99
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 000000000000000b
RBP: 00007fd8eb833eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd8eba26218 R14: 00007fd8eba26180 R15: 00007ffea66628b8
 </TASK>
----------------
Code disassembly (best guess):
   0:	20 01                	and    %al,(%rcx)
   2:	00 00                	add    %al,(%rax)
   4:	48 85 c0             	test   %rax,%rax
   7:	49 0f 44 ee          	cmove  %r14,%rbp
   b:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  12:	fc ff df
  15:	0f b6 04 03          	movzbl (%rbx,%rax,1),%eax
  19:	84 c0                	test   %al,%al
  1b:	0f 85 3b 01 00 00    	jne    0x15c
  21:	41 8b 17             	mov    (%r15),%edx
  24:	4c 89 ef             	mov    %r13,%rdi
  27:	48 89 ee             	mov    %rbp,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 c3 fd ff ff       	jmp    0xfffffdf7
  34:	e8 0d 15 82 f6       	call   0xf6821546
  39:	90                   	nop
  3a:	0f 0b                	ud2
  3c:	90                   	nop
  3d:	e9                   	.byte 0xe9
  3e:	41                   	rex.B
  3f:	fe                   	.byte 0xfe

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/27 18:36 net 53658c6f3682 4cb2b096 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in nl80211_set_tx_bitrate_mask
2026/07/20 21:48 net e13caf1c2658 de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in nl80211_set_tx_bitrate_mask
* Struck through repros no longer work on HEAD.