KASAN: use-after-free Read in ieee80211_monitor_select_queue

Status: upstream: reported C repro on 2026/03/28 06:14
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+610e40369bc02181bad0@syzkaller.appspotmail.com
First crash: 228d, last: 5h37m
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[PATCH wireless] wifi: mac80211: fix slab-out-of-bounds read in ieee80211_monitor_select_queue() 1 (1) 2026/09/25 02:44
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/10/01 linux-6.1.y (ToT) 1a8763b93150 C [report] KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/10/01 upstream (ToT) 551c722f4080 C Didn't crash
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 KASAN: use-after-free Read in ieee80211_monitor_select_queue origin:lts-only 19 syz, C 417 12h01m 286d 0/3 upstream: reported C repro on 2026/01/29 16:08

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in ieee80211_monitor_select_queue+0x20c/0x210 net/mac80211/iface.c:909
Read of size 2 at addr ffff0000d487f1fb by task syz.0.17/4450

CPU: 0 PID: 4450 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
Call trace:
 dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 __asan_report_load2_noabort+0x2c/0x38 mm/kasan/report_generic.c:349
 ieee80211_monitor_select_queue+0x20c/0x210 net/mac80211/iface.c:909
 netdev_core_pick_tx+0x130/0x320 net/core/dev.c:4233
 __dev_queue_xmit+0x738/0x3118 net/core/dev.c:4319
 dev_queue_xmit+0x24/0x34 include/linux/netdevice.h:3051
 packet_snd net/packet/af_packet.c:3127 [inline]
 packet_sendmsg+0x2f9c/0x3fd0 net/packet/af_packet.c:3158
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5c8/0x938 net/socket.c:2518
 ___sys_sendmsg net/socket.c:2572 [inline]
 __sys_sendmsg+0x288/0x374 net/socket.c:2601
 __do_sys_sendmsg net/socket.c:2610 [inline]
 __se_sys_sendmsg net/socket.c:2608 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2608
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the physical page:
page:000000008432faba refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11487f
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 0000000000000000 ffffffff00000101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d487f080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000d487f100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000d487f180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff0000d487f200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000d487f280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

Crashes (371):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/01 19:31 linux-6.1.y 1989cd3d56e2 9a1f7828 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/04/01 19:16 linux-6.1.y 1989cd3d56e2 9a1f7828 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/28 18:18 linux-6.1.y 79807e970724 858db2ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/10/10 10:26 linux-6.1.y a500ba24937a 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/11/04 08:08 linux-6.1.y 08889840163e 5af5b6c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/11/01 07:08 linux-6.1.y 08889840163e 25a0ae84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/10/31 22:51 linux-6.1.y 08889840163e 2041d3f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/10/31 14:56 linux-6.1.y 08889840163e 2041d3f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/10/27 03:38 linux-6.1.y 79807e970724 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/10/22 04:36 linux-6.1.y 79807e970724 4ba27f85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/10/13 12:22 linux-6.1.y a500ba24937a 5a1eeac4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/10/12 19:02 linux-6.1.y a500ba24937a 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/10/08 10:27 linux-6.1.y a500ba24937a 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/10/01 02:54 linux-6.1.y 1a8763b93150 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/09/29 23:07 linux-6.1.y 1a8763b93150 328436b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/09/29 08:28 linux-6.1.y 1a8763b93150 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/09/29 06:23 linux-6.1.y 1a8763b93150 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/03/28 06:13 linux-6.1.y 1989cd3d56e2 356bdfc9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ieee80211_monitor_select_queue
2026/11/11 00:49 linux-6.1.y c75b0cf0982c d3056657 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/11/03 22:01 linux-6.1.y 08889840163e e2d35131 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/29 09:46 linux-6.1.y 79807e970724 b1d00f76 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/26 17:43 linux-6.1.y 79807e970724 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/23 03:57 linux-6.1.y 79807e970724 b55fad29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/21 23:17 linux-6.1.y 79807e970724 4ba27f85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/20 19:11 linux-6.1.y 79807e970724 df8746fb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/10 11:50 linux-6.1.y a500ba24937a 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/06 05:21 linux-6.1.y a500ba24937a f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/02 05:10 linux-6.1.y 1a8763b93150 6d32eb1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/09/30 13:06 linux-6.1.y 1a8763b93150 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/11/11 22:00 linux-6.1.y c75b0cf0982c e56a968c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/11/11 19:34 linux-6.1.y c75b0cf0982c e56a968c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/28 16:13 linux-6.1.y 79807e970724 858db2ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/27 14:29 linux-6.1.y 79807e970724 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/22 15:54 linux-6.1.y 79807e970724 b55fad29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/22 02:13 linux-6.1.y 79807e970724 4ba27f85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/21 10:41 linux-6.1.y 79807e970724 61c200c7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/20 17:52 linux-6.1.y 79807e970724 df8746fb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/19 21:38 linux-6.1.y 79807e970724 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/16 00:56 linux-6.1.y 79807e970724 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/14 02:45 linux-6.1.y a500ba24937a 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/09 22:18 linux-6.1.y a500ba24937a 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/02 06:44 linux-6.1.y 1a8763b93150 6d32eb1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/10/01 18:05 linux-6.1.y 1a8763b93150 f5cdae2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/09/30 11:42 linux-6.1.y 1a8763b93150 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/09/25 08:28 linux-6.1.y 1a8763b93150 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/09/24 07:06 linux-6.1.y 1a8763b93150 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
2026/09/23 16:01 linux-6.1.y 1a8763b93150 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ieee80211_monitor_select_queue
* Struck through repros no longer work on HEAD.