KASAN: slab-out-of-bounds Read in hci_sock_setsockopt

Status: upstream: reported C repro on 2026/02/17 09:12
Bug presence: origin:lts
[Documentation on labels]
Reported-by: syzbot+badc3c56f2aa7037b3b0@syzkaller.appspotmail.com
First crash: 161d, last: 146d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/02/17 lts (merge base) e45d5d41c134 C [report] KASAN: slab-out-of-bounds Read in hci_sock_setsockopt
2026/02/17 upstream (ToT) 970296997869 C Didn't crash
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-out-of-bounds Read in hci_sock_setsockopt bluetooth 17 C done unreliable 5 839d 844d 0/29 auto-obsoleted due to no activity on 2024/07/19 03:49
▶ ▼ Last patch testing requests (8)
Created Duration User Patch Repo Result
2026/06/12 07:32 13m retest repro android13-5.15-lts log
2026/05/19 03:27 15m retest repro android13-5.15-lts log
2026/05/19 03:27 13m retest repro android13-5.15-lts log
2026/05/19 03:27 21m retest repro android13-5.15-lts log
2026/05/19 03:27 33m retest repro android13-5.15-lts log
2026/03/03 16:19 6m retest repro android13-5.15-lts report log
2026/03/03 16:19 6m retest repro android13-5.15-lts report log
2026/03/03 16:19 6m retest repro android13-5.15-lts report log

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]
BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline]
BUG: KASAN: slab-out-of-bounds in hci_sock_setsockopt+0x7f1/0x820 net/bluetooth/hci_sock.c:1925
Read of size 4 at addr ffff88810e1915a3 by task syz.2.17/370

CPU: 1 PID: 370 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0xf1/0x140 mm/kasan/report.c:444
 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report_generic.c:319
 copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]
 copy_from_sockptr include/linux/sockptr.h:55 [inline]
 hci_sock_setsockopt+0x7f1/0x820 net/bluetooth/hci_sock.c:1925
 __sys_setsockopt+0x2e9/0x470 net/socket.c:2202
 __do_sys_setsockopt net/socket.c:2213 [inline]
 __se_sys_setsockopt net/socket.c:2210 [inline]
 __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2210
 x64_sys_call+0x982/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:55
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f75c2057f79
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:00007ffd007bb858 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f75c22d1fa0 RCX: 00007f75c2057f79
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 00007f75c20ee7e0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f75c22d1fac R14: 00007f75c22d1fa0 R15: 00007f75c22d1fa0
 </TASK>

Allocated by task 370:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 ____kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc+0x13d/0x2c0 mm/slub.c:4436
 kmalloc include/linux/slab.h:624 [inline]
 __cgroup_bpf_run_filter_setsockopt+0x8e7/0xaa0 kernel/bpf/cgroup.c:1511
 __sys_setsockopt+0x40e/0x470 net/socket.c:2185
 __do_sys_setsockopt net/socket.c:2213 [inline]
 __se_sys_setsockopt net/socket.c:2210 [inline]
 __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2210
 x64_sys_call+0x982/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:55
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88810e1915a0
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 3 bytes inside of
 8-byte region [ffff88810e1915a0, ffff88810e1915a8)
The buggy address belongs to the page:
page:ffffea0004386440 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10e191
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 0000000100000001 ffff888100042300
raw: 0000000000000000 0000000080660066 00000001ffffffff 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 102, ts 5313248237, free_ts 5313215238
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x2d3a/0x2dc0 mm/page_alloc.c:4485
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5808
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa1/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x381/0x810 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 __kmalloc+0x16a/0x2c0 mm/slub.c:4432
 kmalloc include/linux/slab.h:624 [inline]
 kernfs_fop_write_iter+0x156/0x400 fs/kernfs/file.c:273
 call_write_iter include/linux/fs.h:2212 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x835/0xfd0 fs/read_write.c:594
 ksys_write+0x149/0x250 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:656
 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1472 [inline]
 free_pcp_prepare mm/page_alloc.c:1544 [inline]
 free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534
 free_unref_page+0xae/0x540 mm/page_alloc.c:3616
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x6c/0x100 mm/page_alloc.c:5884
 free_pages+0x82/0x90 mm/page_alloc.c:5895
 selinux_genfs_get_sid+0x20b/0x250 security/selinux/hooks.c:1381
 inode_doinit_with_dentry+0x87a/0xd80 security/selinux/hooks.c:1576
 selinux_d_instantiate+0x27/0x40 security/selinux/hooks.c:6495
 security_d_instantiate+0x9e/0xf0 security/security.c:2074
 d_splice_alias+0x6d/0x390 fs/dcache.c:3073
 kernfs_iop_lookup+0x2c2/0x310 fs/kernfs/dir.c:1175
 lookup_open fs/namei.c:3448 [inline]
 open_last_lookups fs/namei.c:3540 [inline]
 path_openat+0xfc9/0x2f20 fs/namei.c:3747
 do_filp_open+0x1e2/0x410 fs/namei.c:3777
 do_sys_openat2+0x15e/0x7f0 fs/open.c:1236
 do_sys_open fs/open.c:1252 [inline]
 __do_sys_openat fs/open.c:1268 [inline]
 __se_sys_openat fs/open.c:1263 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1263
 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80

Memory state around the buggy address:
 ffff88810e191480: fc 06 fc fc fc fc fa fc fc fc fc fb fc fc fc fc
 ffff88810e191500: fb fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc fb
>ffff88810e191580: fc fc fc fc 01 fc fc fc fc fb fc fc fc fc fb fc
                               ^
 ffff88810e191600: fc fc fc fb fc fc fc fc 05 fc fc fc fc fb fc fc
 ffff88810e191680: fc fc fb fc fc fc fc fa fc fc fc fc fb fc fc fc
==================================================================

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/17 14:10 android13-5.15-lts 13d6d33696ef e439b951 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in hci_sock_setsockopt
2026/02/17 13:01 android13-5.15-lts 13d6d33696ef e439b951 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in hci_sock_setsockopt
2026/02/17 11:59 android13-5.15-lts 13d6d33696ef e439b951 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in hci_sock_setsockopt
2026/02/17 10:14 android13-5.15-lts 13d6d33696ef e439b951 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in hci_sock_setsockopt
2026/02/17 09:05 android13-5.15-lts 13d6d33696ef e439b951 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in hci_sock_setsockopt
2026/02/17 08:23 android13-5.15-lts 13d6d33696ef e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in hci_sock_setsockopt
2026/02/17 08:12 android13-5.15-lts 13d6d33696ef e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in hci_sock_setsockopt
2026/02/17 07:41 android13-5.15-lts 13d6d33696ef e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in hci_sock_setsockopt
* Struck through repros no longer work on HEAD.