KASAN: slab-out-of-bounds Read in ieee80211_ie_split_ric (3)

Status: fixed on 2026/09/14 10:32
Subsystems: wireless
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+cc867e537e4bd36f69bb@syzkaller.appspotmail.com
Fix commit: a2f5286ca4f3 wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()
First crash: 69d, last: 50d
▶ ▼ ✨ AI Jobs (4)
ID Workflow Result Correct Bug Created Started Finished Revision
c5da02f7 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ KASAN: slab-out-of-bounds Read in ieee80211_ie_split_ric (3) 2026/07/18 00:00 2026/07/18 00:00 2026/07/18 00:43 8aaff637
0bd56ba7 assessment-security 💥 KASAN: slab-out-of-bounds Read in ieee80211_ie_split_ric (3) 2026/07/13 00:01 2026/07/13 00:01 2026/07/13 00:20 d78ea535
01e3fe18 assessment-security 💥 KASAN: slab-out-of-bounds Read in ieee80211_ie_split_ric (3) 2026/07/10 00:00 2026/07/10 00:00 2026/07/10 00:22 6e8eff30
c30f8e31 assessment-security 💥 KASAN: slab-out-of-bounds Read in ieee80211_ie_split_ric (3) 2026/07/08 22:15 2026/07/08 22:15 2026/07/08 22:27 93f57954
▶ ▼ Discussions (5)
Title Replies (including bot) Last reply
[PATCH AUTOSEL 6.18-5.10] wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie() 8 (8) 2026/08/31 13:30
[PATCH v2] wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie() 4 (4) 2026/07/29 06:34
[PATCH v3] wifi: cfg80211: add cfg80211_validate_ies() helper and use it 1 (1) 2026/07/29 02:14
[syzbot] [wireless?] KASAN: slab-out-of-bounds Read in ieee80211_ie_split_ric (3) 0 (5) 2026/07/29 01:37
[PATCH] wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie() 4 (4) 2026/07/22 15:21
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-out-of-bounds Read in ieee80211_ie_split_ric wireless 17 3 344d 348d 0/29 auto-obsoleted due to no activity on 2026/01/14 23:58
upstream KASAN: slab-out-of-bounds Read in ieee80211_ie_split_ric (2) wireless 17 1 221d 217d 0/29 auto-obsoleted due to no activity on 2026/05/18 11:44
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2026/07/29 01:37 27m kartikey406@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK log
2026/07/28 02:32 19m retest repro upstream report log
2026/07/25 04:09 26m kartikey406@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK log
2026/07/25 01:53 18m kartikey406@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2026/07/10 01:37 40m kartikey406@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK log

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in skip_ie net/wireless/util.c:2068 [inline]
BUG: KASAN: slab-out-of-bounds in ieee80211_ie_split_ric+0x5a7/0x610 net/wireless/util.c:2124
Read of size 1 at addr ffff88802a5d2e01 by task syz.0.18/5932

CPU: 2 UID: 0 PID: 5932 Comm: syz.0.18 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
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 skip_ie net/wireless/util.c:2068 [inline]
 ieee80211_ie_split_ric+0x5a7/0x610 net/wireless/util.c:2124
 ieee80211_ie_split include/net/cfg80211.h:10226 [inline]
 cfg80211_sme_get_conn_ies net/wireless/sme.c:529 [inline]
 cfg80211_sme_connect net/wireless/sme.c:586 [inline]
 cfg80211_connect+0x18a9/0x1ff0 net/wireless/sme.c:1528
 cfg80211_mgd_wext_connect+0x57d/0x6d0 net/wireless/wext-sme.c:57
 cfg80211_mgd_wext_siwessid+0x36e/0x750 net/wireless/wext-sme.c:184
 cfg80211_wext_siwessid+0xd2/0x140 net/wireless/wext-compat.c:1415
 ioctl_standard_iw_point+0x5b4/0xc90 net/wireless/wext-core.c:864
 ioctl_standard_call+0x167/0x1d0 net/wireless/wext-core.c:1049
 wireless_process_ioctl net/wireless/wext-core.c:980 [inline]
 wext_ioctl_dispatch.constprop.0+0x312/0x3e0 net/wireless/wext-core.c:1013
 wext_handle_ioctl+0x105/0x1b0 net/wireless/wext-core.c:1074
 sock_ioctl+0x2d4/0x6b0 net/socket.c:1353
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3ccf39de59
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:00007ffe5c899268 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3ccf625fa0 RCX: 00007f3ccf39de59
RDX: 0000200000000040 RSI: 0000000000008b1a RDI: 0000000000000006
RBP: 00007f3ccf433e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3ccf625fac R14: 00007f3ccf625fa0 R15: 00007f3ccf625fa0
 </TASK>

Allocated by task 5932:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5362 [inline]
 __kmalloc_node_track_caller_noprof+0x331/0x830 mm/slub.c:5497
 kmemdup_noprof+0x29/0x60 mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:715 [inline]
 cfg80211_wext_siwgenie+0x15f/0x410 net/wireless/wext-sme.c:322
 ioctl_standard_iw_point+0x5b4/0xc90 net/wireless/wext-core.c:864
 ioctl_standard_call+0x167/0x1d0 net/wireless/wext-core.c:1049
 wireless_process_ioctl net/wireless/wext-core.c:980 [inline]
 wext_ioctl_dispatch.constprop.0+0x312/0x3e0 net/wireless/wext-core.c:1013
 wext_handle_ioctl+0x105/0x1b0 net/wireless/wext-core.c:1074
 sock_ioctl+0x2d4/0x6b0 net/socket.c:1353
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802a5d2e00
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 0 bytes to the right of
 allocated 1-byte region [ffff88802a5d2e00, ffff88802a5d2e01)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802a5d2000 pfn:0x2a5d2
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff88801bc42500 ffffea0000a966d0 ffffea000087d850
raw: ffff88802a5d2000 000000080080007e 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2c00(GFP_NOIO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 12366518257, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3294 [inline]
 allocate_slab mm/slub.c:3408 [inline]
 new_slab+0xa2/0x650 mm/slub.c:3454
 refill_objects+0xe3/0x410 mm/slub.c:7338
 refill_sheaf mm/slub.c:2832 [inline]
 __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4703
 alloc_from_pcs mm/slub.c:4801 [inline]
 slab_alloc_node mm/slub.c:4933 [inline]
 __kmalloc_cache_noprof+0x479/0x6c0 mm/slub.c:5511
 _kmalloc_noprof include/linux/slab.h:969 [inline]
 usb_control_msg+0xbc/0x4b0 drivers/usb/core/message.c:157
 set_port_feature drivers/usb/core/hub.c:466 [inline]
 hub_power_on+0x193/0x4f0 drivers/usb/core/hub.c:979
 hub_activate+0x146e/0x1c40 drivers/usb/core/hub.c:1139
 hub_configure drivers/usb/core/hub.c:1766 [inline]
 hub_probe.cold+0x2eca/0x2eda drivers/usb/core/hub.c:2001
 usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:628 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:706
 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868
 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802a5d2d00: fa fc fc fc fa fc fc fc 06 fc fc fc 07 fc fc fc
 ffff88802a5d2d80: 06 fc fc fc 06 fc fc fc fa fc fc fc fa fc fc fc
>ffff88802a5d2e00: 01 fc fc fc 05 fc fc fc 00 fc fc fc 00 fc fc fc
                   ^
 ffff88802a5d2e80: fa fc fc fc fa fc fc fc 06 fc fc fc 06 fc fc fc
 ffff88802a5d2f00: fa fc fc fc fa fc fc fc fa fc fc fc 00 fc fc fc
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/14 02:20 upstream 0f26556c5eee 2130f682 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Read in ieee80211_ie_split_ric
2026/07/08 22:15 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a52d6c7160f7 ab40da58 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in ieee80211_ie_split_ric
* Struck through repros no longer work on HEAD.