KASAN: use-after-free Read in ntfs_test_inode (3)

Status: upstream: reported on 2026/10/16 11:06
Reported-by: syzbot+6e6fd1ad9a09b8acf8c2@syzkaller.appspotmail.com
First crash: 11d, last: 12h18m
▶ ▼ Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 KASAN: use-after-free Read in ntfs_test_inode (3) 19 10 137d 218d 0/3 auto-obsoleted due to no activity on 2026/09/20 16:17
linux-5.15 KASAN: use-after-free Read in ntfs_test_inode (2) 19 20 356d 793d 0/3 auto-obsoleted due to no activity on 2026/02/13 06:39
linux-6.1 KASAN: use-after-free Read in ntfs_test_inode (2) 19 16 175d 656d 0/3 auto-obsoleted due to no activity on 2026/08/13 09:22
linux-4.19 KASAN: use-after-free Read in ntfs_test_inode 19 1 1429d 1429d 0/1 auto-obsoleted due to no activity on 2023/03/28 18:25
upstream KASAN: use-after-free Read in ntfs_test_inode ntfs 19 syz, C done 402 1055d 1989d 25/29 fixed on 2023/12/21 01:43
linux-6.1 KASAN: use-after-free Read in ntfs_test_inode 19 2 946d 948d 0/3 auto-obsoleted due to no activity on 2024/07/03 10:22
linux-5.15 KASAN: use-after-free Read in ntfs_test_inode 19 6 1112d 1312d 0/3 auto-obsoleted due to no activity on 2024/01/19 06:00
upstream KASAN: slab-use-after-free Read in ntfs_test_inode ntfs 19 5 1022d 1022d 0/29 auto-obsoleted due to no activity on 2024/04/18 20:01
linux-6.6 KASAN: slab-use-after-free Read in ntfs_test_inode 19 7 153d 280d 0/2 auto-obsoleted due to no activity on 2026/09/04 11:25
linux-4.14 KASAN: slab-out-of-bounds Read in ntfs_test_inode 17 1 1714d 1714d 0/1 auto-closed as invalid on 2022/06/16 22:11

Sample crash report:
ntfs: (device loop1): load_and_init_upcase(): Failed to load $UpCase from the volume. Using default.
ntfs: volume version 3.1.
==================================================================
BUG: KASAN: use-after-free in generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
BUG: KASAN: use-after-free in NInoAttr fs/ntfs/inode.h:200 [inline]
BUG: KASAN: use-after-free in ntfs_test_inode+0x8c/0x28c fs/ntfs/inode.c:55
Read of size 8 at addr ffff0000ea9712a0 by task syz.1.3429/11819

CPU: 0 PID: 11819 Comm: syz.1.3429 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 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_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351
 generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
 NInoAttr fs/ntfs/inode.h:200 [inline]
 ntfs_test_inode+0x8c/0x28c fs/ntfs/inode.c:55
 find_inode+0x144/0x320 fs/inode.c:960
 ilookup5_nowait fs/inode.c:1515 [inline]
 ilookup5+0xc0/0x1d0 fs/inode.c:1544
 iget5_locked+0x48/0x22c fs/inode.c:1325
 ntfs_iget+0xbc/0x19c fs/ntfs/inode.c:168
 load_and_check_logfile+0x48/0x100 fs/ntfs/super.c:1208
 load_system_files+0x329c/0x4b20 fs/ntfs/super.c:1941
 ntfs_fill_super+0x14e8/0x2338 fs/ntfs/super.c:2892
 mount_bdev+0x264/0x35c fs/super.c:1454
 ntfs_mount+0x44/0x58 fs/ntfs/super.c:3049
 legacy_get_tree+0xd8/0x174 fs/fs_context.c:632
 vfs_get_tree+0x90/0x278 fs/super.c:1584
 do_new_mount+0x228/0x804 fs/namespace.c:3078
 path_mount+0x5ac/0xe6c fs/namespace.c:3408
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount fs/namespace.c:3606 [inline]
 __arm64_sys_mount+0x4a0/0x5a0 fs/namespace.c:3606
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x12c 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

Allocated by task 9216:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x74/0x430 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc_lru+0x1a8/0x284 mm/slub.c:3390
 alloc_inode_sb include/linux/fs.h:3278 [inline]
 reiserfs_alloc_inode+0x2c/0xc4 fs/reiserfs/super.c:642
 alloc_inode fs/inode.c:261 [inline]
 iget5_locked+0xa4/0x22c fs/inode.c:1328
 reiserfs_fill_super+0xea8/0x1dbc fs/reiserfs/super.c:2053
 mount_bdev+0x264/0x35c fs/super.c:1454
 get_super_block+0x44/0x58 fs/reiserfs/super.c:2601
 legacy_get_tree+0xd8/0x174 fs/fs_context.c:632
 vfs_get_tree+0x90/0x278 fs/super.c:1584
 do_new_mount+0x228/0x804 fs/namespace.c:3078
 path_mount+0x5ac/0xe6c fs/namespace.c:3408
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount fs/namespace.c:3606 [inline]
 __arm64_sys_mount+0x4a0/0x5a0 fs/namespace.c:3606
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x12c 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

Last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 call_rcu+0x104/0x958 kernel/rcu/tree.c:2849
 destroy_inode fs/inode.c:316 [inline]
 evict+0x74c/0x824 fs/inode.c:720
 dispose_list fs/inode.c:738 [inline]
 evict_inodes+0x604/0x6a4 fs/inode.c:792
 generic_shutdown_super+0xa4/0x32c fs/super.c:480
 kill_block_super+0x78/0xe0 fs/super.c:1481
 reiserfs_kill_sb+0x124/0x13c fs/reiserfs/super.c:570
 deactivate_locked_super+0xb4/0x128 fs/super.c:332
 deactivate_super+0xe4/0x104 fs/super.c:363
 cleanup_mnt+0x3a8/0x430 fs/namespace.c:1191
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1198
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x9c/0x12c arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Second to last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 call_rcu+0x104/0x958 kernel/rcu/tree.c:2849
 destroy_inode fs/inode.c:316 [inline]
 evict+0x74c/0x824 fs/inode.c:720
 dispose_list fs/inode.c:738 [inline]
 evict_inodes+0x604/0x6a4 fs/inode.c:792
 generic_shutdown_super+0xa4/0x32c fs/super.c:480
 kill_block_super+0x78/0xe0 fs/super.c:1481
 reiserfs_kill_sb+0x124/0x13c fs/reiserfs/super.c:570
 deactivate_locked_super+0xb4/0x128 fs/super.c:332
 deactivate_super+0xe4/0x104 fs/super.c:363
 cleanup_mnt+0x3a8/0x430 fs/namespace.c:1191
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1198
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x9c/0x12c arch/arm64/kernel/entry-common.c:638
 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 object at ffff0000ea970d40
 which belongs to the cache reiser_inode_cache of size 1568
The buggy address is located 1376 bytes inside of
 1568-byte region [ffff0000ea970d40, ffff0000ea971360)

The buggy address belongs to the physical page:
page:00000000db6a4412 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000ea9706a0 pfn:0x12a970
head:00000000db6a4412 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff0000cd87e801
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c4faa300
raw: ffff0000ea9706a0 0000000080130012 00000001ffffffff ffff0000cd87e801
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ea971180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000ea971200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000ea971280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff0000ea971300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff0000ea971380: fc fc fc fc fc fc fc fc fc fc fc fc 00 00 00 00
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/16 11:05 linux-6.1.y 79807e970724 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in ntfs_test_inode
2026/10/27 16:03 linux-6.1.y 79807e970724 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: slab-out-of-bounds Read in ntfs_test_inode
* Struck through repros no longer work on HEAD.