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

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision
91003057	repro-c	Reproduced: ✅	❓	KASAN: slab-out-of-bounds Read in cachefiles_set_object_xattr	2026/08/13 20:02	2026/08/13 21:31	2026/08/13 23:08	0165196a
e6c8d8cd	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	KASAN: slab-out-of-bounds Read in cachefiles_set_object_xattr	2026/08/02 01:21	2026/08/02 01:21	2026/08/02 02:12	e611ffe1

Title	Replies (including bot)	Last reply
[PATCH] cachefiles: Fix OOB access in coherency trace	1 (1)	2026/08/16 18:55
[syzbot] [netfs?] KASAN: slab-out-of-bounds Read in cachefiles_set_object_xattr	0 (1)	2026/08/14 09:05

Title

Replies (including bot)

Last reply

[PATCH] cachefiles: Fix OOB access in coherency trace

1 (1)

2026/08/16 18:55

[syzbot] [netfs?] KASAN: slab-out-of-bounds Read in cachefiles_set_object_xattr

0 (1)

2026/08/14 09:05

Created	Duration	User	Patch	Repo	Result
2026/08/14 08:23	14m	nogikh@google.com		upstream	report job log log

Created

Duration

User

Patch

Repo

Result

2026/08/14 08:23

14m

nogikh@google.com

upstream

report job log log

evm: overlay not supported ================================================================== BUG: KASAN: slab-out-of-bounds in __swab64p include/uapi/linux/swab.h:202 [inline] BUG: KASAN: slab-out-of-bounds in __be64_to_cpup include/uapi/linux/byteorder/little_endian.h:75 [inline] BUG: KASAN: slab-out-of-bounds in cachefiles_set_object_xattr+0x713/0x7a0 fs/cachefiles/xattr.c:88 Read of size 8 at addr ffff88801c329b52 by task kworker/u33:5/163 CPU: 3 UID: 0 PID: 163 Comm: kworker/u33:5 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 Workqueue: fscache fscache_cookie_worker 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 __swab64p include/uapi/linux/swab.h:202 [inline] __be64_to_cpup include/uapi/linux/byteorder/little_endian.h:75 [inline] cachefiles_set_object_xattr+0x713/0x7a0 fs/cachefiles/xattr.c:88 cachefiles_commit_object fs/cachefiles/interface.c:319 [inline] cachefiles_clean_up_object fs/cachefiles/interface.c:344 [inline] cachefiles_withdraw_cookie+0x8f4/0xc50 fs/cachefiles/interface.c:381 fscache_cookie_state_machine fs/netfs/fscache_cookie.c:780 [inline] fscache_cookie_worker+0x54f/0x1270 fs/netfs/fscache_cookie.c:835 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Allocated by task 163: 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:5334 [inline] __kmalloc_noprof+0x322/0x820 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] cachefiles_set_object_xattr+0xef/0x7a0 fs/cachefiles/xattr.c:53 cachefiles_commit_object fs/cachefiles/interface.c:319 [inline] cachefiles_clean_up_object fs/cachefiles/interface.c:344 [inline] cachefiles_withdraw_cookie+0x8f4/0xc50 fs/cachefiles/interface.c:381 fscache_cookie_state_machine fs/netfs/fscache_cookie.c:780 [inline] fscache_cookie_worker+0x54f/0x1270 fs/netfs/fscache_cookie.c:835 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 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 ffff88801c329b40 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 18 bytes inside of allocated 22-byte region [ffff88801c329b40, ffff88801c329b56) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c329 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801bc42780 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800400040 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 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5919, tgid 5919 (dhcpcd-run-hook), ts 64295555076, free_ts 64295085659 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:3266 [inline] allocate_slab mm/slub.c:3380 [inline] new_slab+0xa2/0x640 mm/slub.c:3426 refill_objects+0xe3/0x410 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4675 alloc_from_pcs mm/slub.c:4773 [inline] slab_alloc_node mm/slub.c:4905 [inline] __kmalloc_cache_noprof+0x479/0x6c0 mm/slub.c:5485 _kmalloc_noprof include/linux/slab.h:988 [inline] slab_free_hook mm/slub.c:2629 [inline] slab_free mm/slub.c:6377 [inline] kmem_cache_free+0x412/0x6b0 mm/slub.c:6504 tear_down_vmas+0x2a5/0x600 mm/mmap.c:1262 exit_mmap+0x469/0xa00 mm/mmap.c:1320 __mmput+0x12a/0x410 kernel/fork.c:1187 mmput+0x67/0x80 kernel/fork.c:1210 exit_mm kernel/exit.c:615 [inline] do_exit+0x8b1/0x2ae0 kernel/exit.c:997 do_group_exit+0xd5/0x2a0 kernel/exit.c:1152 __do_sys_exit_group kernel/exit.c:1163 [inline] __se_sys_exit_group kernel/exit.c:1161 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1161 x64_sys_call+0x102c/0x1530 arch/x86/include/generated/asm/syscalls_64.h:232 page last free pid 5919 tgid 5919 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950 tlb_batch_list_free mm/mmu_gather.c:161 [inline] tlb_finish_mmu+0x27d/0x810 mm/mmu_gather.c:552 exit_mmap+0x454/0xa00 mm/mmap.c:1313 __mmput+0x12a/0x410 kernel/fork.c:1187 mmput+0x67/0x80 kernel/fork.c:1210 exit_mm kernel/exit.c:615 [inline] do_exit+0x8b1/0x2ae0 kernel/exit.c:997 do_group_exit+0xd5/0x2a0 kernel/exit.c:1152 __do_sys_exit_group kernel/exit.c:1163 [inline] __se_sys_exit_group kernel/exit.c:1161 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1161 x64_sys_call+0x102c/0x1530 arch/x86/include/generated/asm/syscalls_64.h:232 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 Memory state around the buggy address: ffff88801c329a00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff88801c329a80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc >ffff88801c329b00: fa fb fb fb fc fc fc fc 00 00 06 fc fc fc fc fc ^ ffff88801c329b80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff88801c329c00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ==================================================================

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/08/14 09:04	upstream	2f1baf1fc892	7664cf44	.config	console log	report		C			ci-qemu-upstream	KASAN: slab-out-of-bounds Read in cachefiles_set_object_xattr
2026/07/31 20:11	upstream	8ba098e6b6ff	7664cf44	.config	console log	report				[disk image (non-bootable)] [vmlinux] [kernel image]	ci-snapshot-upstream-root	KASAN: slab-out-of-bounds Read in cachefiles_set_object_xattr

Crashes (2):

Assets (help?)