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* [syzbot] [usb?] KASAN: slab-use-after-free Read in stub_rx_loop
@ 2026-07-28 14:25 syzbot
  2026-08-26 16:49 ` syzbot
  0 siblings, 1 reply; 18+ messages in thread
From: syzbot @ 2026-07-28 14:25 UTC (permalink / raw)
  To: gregkh, i, linux-kernel, linux-usb, shuah, syzkaller-bugs,
	valentina.manea.m

Hello,

syzbot found the following issue on:

HEAD commit:    48a5a7ab8d6a Merge tag 'v7.2-rc4-smb3-client-fixes' of git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=113c32ea580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=20c9876b0f77b546
dashboard link: https://syzkaller.appspot.com/bug?extid=06fa667a0931a3430026
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-48a5a7ab.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cca5551ec121/vmlinux-48a5a7ab.xz
kernel image: https://storage.googleapis.com/syzbot-assets/30b6e710a3ae/bzImage-48a5a7ab.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+06fa667a0931a3430026@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in stub_recv_cmd_submit drivers/usb/usbip/stub_rx.c:609 [inline]
BUG: KASAN: slab-use-after-free in stub_rx_pdu drivers/usb/usbip/stub_rx.c:688 [inline]
BUG: KASAN: slab-use-after-free in stub_rx_loop+0x2965/0x2ee0 drivers/usb/usbip/stub_rx.c:707
Read of size 4 at addr ffff888012cacdb0 by task stub_rx/5324

CPU: 0 UID: 0 PID: 5324 Comm: stub_rx 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_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 stub_recv_cmd_submit drivers/usb/usbip/stub_rx.c:609 [inline]
 stub_rx_pdu drivers/usb/usbip/stub_rx.c:688 [inline]
 stub_rx_loop+0x2965/0x2ee0 drivers/usb/usbip/stub_rx.c:707
 kthread+0x388/0x470 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>

Allocated by task 5324:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4612 [inline]
 slab_alloc_node mm/slub.c:4945 [inline]
 kmem_cache_alloc_noprof+0x2a0/0x5f0 mm/slub.c:4959
 stub_priv_alloc drivers/usb/usbip/stub_rx.c:314 [inline]
 stub_recv_cmd_submit drivers/usb/usbip/stub_rx.c:490 [inline]
 stub_rx_pdu drivers/usb/usbip/stub_rx.c:688 [inline]
 stub_rx_loop+0xad9/0x2ee0 drivers/usb/usbip/stub_rx.c:707
 kthread+0x388/0x470 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

Freed by task 5325:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2705 [inline]
 slab_free mm/slub.c:6405 [inline]
 kmem_cache_free+0x182/0x650 mm/slub.c:6532
 stub_send_ret_submit drivers/usb/usbip/stub_tx.c:333 [inline]
 stub_tx_loop+0x1b16/0x2800 drivers/usb/usbip/stub_tx.c:437
 kthread+0x388/0x470 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

The buggy address belongs to the object at ffff888012cacd80
 which belongs to the cache stub_priv of size 64
The buggy address is located 48 bytes inside of
 freed 64-byte region [ffff888012cacd80, ffff888012cacdc0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888012cace00 pfn:0x12cac
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff888033fd4280 ffff8880340e27c8 ffff8880340e27c8
raw: ffff888012cace00 000000080020001c 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5324, tgid 5324 (stub_rx), ts 94362120884, free_ts 93984048542
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3294 [inline]
 allocate_slab+0x79/0x5e0 mm/slub.c:3408
 new_slab mm/slub.c:3454 [inline]
 refill_objects+0x2d5/0x350 mm/slub.c:7338
 refill_sheaf mm/slub.c:2832 [inline]
 __pcs_replace_empty_main+0x2bf/0x6b0 mm/slub.c:4703
 alloc_from_pcs mm/slub.c:4801 [inline]
 slab_alloc_node mm/slub.c:4933 [inline]
 kmem_cache_alloc_noprof+0x382/0x5f0 mm/slub.c:4959
 stub_priv_alloc drivers/usb/usbip/stub_rx.c:314 [inline]
 stub_recv_cmd_submit drivers/usb/usbip/stub_rx.c:490 [inline]
 stub_rx_pdu drivers/usb/usbip/stub_rx.c:688 [inline]
 stub_rx_loop+0xad9/0x2ee0 drivers/usb/usbip/stub_rx.c:707
 kthread+0x388/0x470 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
page last free pid 4993 tgid 4993 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0xc1e/0xd10 mm/page_alloc.c:2950
 __slab_free+0x274/0x2c0 mm/slub.c:5767
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4612 [inline]
 slab_alloc_node mm/slub.c:4945 [inline]
 kmem_cache_alloc_node_noprof+0x355/0x610 mm/slub.c:5017
 __alloc_skb+0x1d7/0x7a0 net/core/skbuff.c:704
 alloc_skb include/linux/skbuff.h:1384 [inline]
 alloc_skb_with_frags+0xc6/0x760 net/core/skbuff.c:6769
 sock_alloc_send_pskb+0x878/0x990 net/core/sock.c:3013
 unix_dgram_sendmsg+0x4fe/0x1870 net/unix/af_unix.c:2136
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775
 __sock_sendmsg net/socket.c:790 [inline]
 sock_write_iter+0x2de/0x3e0 net/socket.c:1241
 do_iter_readv_writev+0x612/0x8c0 fs/read_write.c:-1
 vfs_writev+0x343/0x990 fs/read_write.c:1058
 do_writev+0x154/0x2e0 fs/read_write.c:1104
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94

Memory state around the buggy address:
 ffff888012cacc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888012cacd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888012cacd80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                                     ^
 ffff888012cace00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888012cace80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

^ permalink raw reply	[flat|nested] 18+ messages in thread
* Re: [syzbot] [ntfs3?] general protection fault in al_destroy
@ 2026-08-27  5:32 syzbot
  2026-08-27  7:03 ` [syzbot] [usb?] KASAN: slab-use-after-free Read in stub_rx_loop Edward Adam Davis
  0 siblings, 1 reply; 18+ messages in thread
From: syzbot @ 2026-08-27  5:32 UTC (permalink / raw)
  To: almaz.alexandrovich, linux-kernel, ntfs3, syzkaller-bugs

syzbot has found a reproducer for the following issue on:

HEAD commit:    502d45774af0 Merge tag 'clk-for-linus' of git://git.kernel..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13166d49580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dfd8ec781284be4e
dashboard link: https://syzkaller.appspot.com/bug?extid=04cf7b83f6dd2c3a54c8
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17d04579580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=127e5625580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fb0ebb231418/disk-502d4577.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/82fe4e8c3ba9/vmlinux-502d4577.xz
kernel image: https://storage.googleapis.com/syzbot-assets/40eb9f92a77c/bzImage-502d4577.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/63d316385c91/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+04cf7b83f6dd2c3a54c8@syzkaller.appspotmail.com

         option from the mount to silence this warning.
=======================================================
ntfs3(loop0): Different NTFS sector size (1024) and media sector size (512).
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000042: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000210-0x0000000000000217]
CPU: 0 UID: 0 PID: 5627 Comm: syz-executor424 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:run_close fs/ntfs3/ntfs_fs.h:1034 [inline]
RIP: 0010:al_destroy+0x49/0xc0 fs/ntfs3/attrlist.c:33
Code: 02 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 88 e5 06 ff 48 8b 1b 4c 8d b3 10 02 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 68 e5 06 ff 48 8b bb 10 02 00 00
RSP: 0018:ffffc9000387f960 EFLAGS: 00010216
RAX: 0000000000000042 RBX: 0000000000000000 RCX: ffff888075ce5dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888070090e20
RBP: 0000000000000001 R08: ffffffff907a0d7f R09: 1ffffffff20f41af
R10: dffffc0000000000 R11: fffffbfff20f41b0 R12: ffff888070091070
R13: dffffc0000000000 R14: 0000000000000210 R15: dffffc0000000000
FS:  0000555571c6a400(0000) GS:ffff888124ce3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0e9a7a2000 CR3: 00000000217c4000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ni_clear+0x5d/0x630 fs/ntfs3/frecord.c:110
 evict+0x624/0xb50 fs/inode.c:822
 ntfs_new_inode+0x8c/0x120 fs/ntfs3/fsntfs.c:1719
 ntfs_create_inode+0x6e7/0x3420 fs/ntfs3/inode.c:1520
 ntfs_mkdir+0x37/0x50 fs/ntfs3/namei.c:234
 vfs_mkdir+0x40c/0x620 fs/namei.c:5410
 filename_mkdirat+0x285/0x510 fs/namei.c:5443
 __do_sys_mkdirat fs/namei.c:5464 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f82637ada69
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcfa0d5d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f82637ada69
RDX: 00000000000001ff RSI: 0000200000000040 RDI: 00000000ffffff9c
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000555571c6b570
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcfa0d5da0
R13: 0000000000000002 R14: 431bde82d7b634db R15: 00007f826380d04b
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:run_close fs/ntfs3/ntfs_fs.h:1034 [inline]
RIP: 0010:al_destroy+0x49/0xc0 fs/ntfs3/attrlist.c:33
Code: 02 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 88 e5 06 ff 48 8b 1b 4c 8d b3 10 02 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 68 e5 06 ff 48 8b bb 10 02 00 00
RSP: 0018:ffffc9000387f960 EFLAGS: 00010216
RAX: 0000000000000042 RBX: 0000000000000000 RCX: ffff888075ce5dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888070090e20
RBP: 0000000000000001 R08: ffffffff907a0d7f R09: 1ffffffff20f41af
R10: dffffc0000000000 R11: fffffbfff20f41b0 R12: ffff888070091070
R13: dffffc0000000000 R14: 0000000000000210 R15: dffffc0000000000
FS:  0000555571c6a400(0000) GS:ffff888124ce3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0e9a7a2000 CR3: 00000000217c4000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	02 00                	add    (%rax),%al
   2:	00 48 89             	add    %cl,-0x77(%rax)
   5:	d8 48 c1             	fmuls  -0x3f(%rax)
   8:	e8 03 42 80 3c       	call   0x3c804210
   d:	38 00                	cmp    %al,(%rax)
   f:	74 08                	je     0x19
  11:	48 89 df             	mov    %rbx,%rdi
  14:	e8 88 e5 06 ff       	call   0xff06e5a1
  19:	48 8b 1b             	mov    (%rbx),%rbx
  1c:	4c 8d b3 10 02 00 00 	lea    0x210(%rbx),%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 68 e5 06 ff       	call   0xff06e5a1
  39:	48 8b bb 10 02 00 00 	mov    0x210(%rbx),%rdi


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

^ permalink raw reply	[flat|nested] 18+ messages in thread
end of thread, other threads:[~2026-08-27  7:03 UTC | newest]

Thread overview: 18+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2026-07-28 14:25 [syzbot] [usb?] KASAN: slab-use-after-free Read in stub_rx_loop syzbot
2026-08-26 16:49 ` syzbot
2026-08-26 23:32   ` Hillf Danton
2026-08-26 23:33     ` syzbot
2026-08-26 23:46   ` Hillf Danton
2026-08-26 23:46     ` syzbot
2026-08-27  0:06   ` Hillf Danton
2026-08-27  0:06     ` syzbot
2026-08-27  0:17   ` Hillf Danton
2026-08-27  0:18     ` syzbot
2026-08-27  0:20   ` Hillf Danton
2026-08-27  0:21     ` syzbot
2026-08-27  0:25   ` Hillf Danton
2026-08-27  2:12     ` syzbot
2026-08-27  0:46   ` Edward Adam Davis
2026-08-27  2:31     ` syzbot
2026-08-27  1:21   ` [PATCH] usbip: prevent priv from uaf in cmd submit Edward Adam Davis
2026-08-27  5:32 [syzbot] [ntfs3?] general protection fault in al_destroy syzbot
2026-08-27  7:03 ` [syzbot] [usb?] KASAN: slab-use-after-free Read in stub_rx_loop Edward Adam Davis

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