KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet

Status: upstream: reported C repro on 2026/09/21 15:53
Subsystems: ecryptfs
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+e4391e0d6e7c89b8c84e@syzkaller.appspotmail.com
First crash: 12d, last: 1h49m
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
c9dfa951 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet 2026/09/19 01:11 2026/09/19 01:11 2026/09/19 01:58 853b104b
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] ecryptfs: validate auth_tok key payload size before use 1 (1) 2026/09/22 04:44
[syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet 0 (2) 2026/09/22 04:12
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/09/22 04:12 25m kartikey406@gmail.com patch upstream OK job log log

Sample crash report:
EXT4-fs (loop0): mounted filesystem 76b65be2-f6da-4727-8c75-0525a5b65a09 r/w without journal. Quota mode: none.
ext4 filesystem being mounted at /0/mnt supports timestamps until 2038-01-19 (0x7fffffff)
==================================================================
BUG: KASAN: slab-out-of-bounds in ecryptfs_write_tag_70_packet+0x1241/0x12e0 fs/ecryptfs/keystore.c:742
Read of size 4 at addr ffff88801225e298 by task syz.0.17/5512

CPU: 0 UID: 0 PID: 5512 Comm: syz.0.17 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
 ecryptfs_write_tag_70_packet+0x1241/0x12e0 fs/ecryptfs/keystore.c:742
 ecryptfs_encrypt_filename fs/ecryptfs/crypto.c:1378 [inline]
 ecryptfs_encrypt_and_encode_filename+0x576/0x1580 fs/ecryptfs/crypto.c:1789
 ecryptfs_lookup+0x20e/0x780 fs/ecryptfs/inode.c:402
 lookup_open+0x9e1/0x1a40 fs/namei.c:4528
 open_last_lookups fs/namei.c:4767 [inline]
 path_openat+0x677/0x1d60 fs/namei.c:4997
 do_file_open+0x23e/0x4a0 fs/namei.c:5029
 do_sys_openat2+0x115/0x200 fs/open.c:1417
 do_sys_open fs/open.c:1423 [inline]
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1434
 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: 0033:0x7fa04199e159
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:00007fff0259f088 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fa041c25fa0 RCX: 00007fa04199e159
RDX: 0000000000000800 RSI: 0000200000000680 RDI: ffffffffffffff9c
RBP: 00007fa041a3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa041c25fac R14: 00007fa041c25fa0 R15: 00007fa041c25fa0
 </TASK>

Allocated by task 5512:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5414 [inline]
 __kmalloc_noprof+0x36b/0x720 mm/slub.c:5439
 _kmalloc_noprof include/linux/slab.h:995 [inline]
 user_preparse+0x9e/0x160 security/keys/user_defined.c:67
 __key_create_or_update+0x3a9/0xa80 security/keys/key.c:857
 key_create_or_update+0x42/0x60 security/keys/key.c:1021
 __do_sys_add_key security/keys/keyctl.c:134 [inline]
 __se_sys_add_key+0x349/0x420 security/keys/keyctl.c:74
 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

The buggy address belongs to the object at ffff88801225e000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 270 bytes to the right of
 allocated 394-byte region [ffff88801225e000, ffff88801225e18a)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1225e
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b041c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b041c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5447, tgid 5447 (syz-executor), ts 113774270032
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
 alloc_slab_page mm/slub.c:3347 [inline]
 allocate_slab+0x7d/0x620 mm/slub.c:3462
 new_slab mm/slub.c:3513 [inline]
 refill_objects+0x2d5/0x350 mm/slub.c:7417
 refill_sheaf mm/slub.c:2885 [inline]
 __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774
 alloc_from_pcs mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:4984 [inline]
 __do_kmalloc_node mm/slub.c:5413 [inline]
 __kmalloc_noprof+0x47b/0x720 mm/slub.c:5439
 _kmalloc_noprof include/linux/slab.h:995 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 fib6_info_alloc+0x30/0xf0 net/ipv6/ip6_fib.c:155
 ip6_route_info_create+0x149/0x890 net/ipv6/route.c:3833
 ip6_route_add+0x49/0x1b0 net/ipv6/route.c:3962
 addrconf_prefix_route+0x3a2/0x480 net/ipv6/addrconf.c:2504
 inet6_addr_add+0x504/0xb50 net/ipv6/addrconf.c:3077
 inet6_rtm_newaddr+0x9fc/0xe00 net/ipv6/addrconf.c:5095
 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7137
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2575
 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline]
 netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1364
page last free pid 5421 tgid 5421 ts 110085182085 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
 __tlb_remove_table_free mm/mmu_gather.c:228 [inline]
 tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:291
 rcu_do_batch kernel/rcu/tree.c:2650 [inline]
 rcu_core+0x926/0x1260 kernel/rcu/tree.c:2919
 handle_softirqs+0x226/0x860 kernel/softirq.c:645
 __do_softirq kernel/softirq.c:679 [inline]
 invoke_softirq kernel/softirq.c:519 [inline]
 __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674

Memory state around the buggy address:
 ffff88801225e180: 00 02 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801225e200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801225e280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff88801225e300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801225e380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (59):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/20 13:50 upstream 518e5b794c06 853b104b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/30 04:32 upstream 6f8319e3e9a4 328436b3 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/28 06:19 upstream d266640c6c76 a3c7249d .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 23:27 upstream d266640c6c76 a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/27 13:03 upstream fd179f8a05be a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/27 01:28 upstream 6812ce4e4379 a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/27 01:28 upstream 6812ce4e4379 a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/27 01:28 upstream 6812ce4e4379 a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/27 01:28 upstream 6812ce4e4379 a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/25 11:56 upstream 165768bb7026 f281d9d2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/25 11:56 upstream 165768bb7026 f281d9d2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/23 10:42 upstream fe2ec83746e5 abce1216 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/23 10:42 upstream fe2ec83746e5 abce1216 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/20 12:59 upstream 518e5b794c06 853b104b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/20 12:59 upstream 518e5b794c06 853b104b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/20 12:59 upstream 518e5b794c06 853b104b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/20 12:58 upstream 518e5b794c06 853b104b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/19 10:10 upstream 40288c9206c1 853b104b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/19 10:10 upstream 40288c9206c1 853b104b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/18 04:15 upstream 4982d3552a3b 8d7d05f1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/18 04:15 upstream 4982d3552a3b 8d7d05f1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/17 16:27 upstream 238650ef6c7c 4a607247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/17 16:26 upstream 238650ef6c7c 4a607247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
2026/09/29 10:12 upstream 72d3fcf802c4 7bf4ea23 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/29 01:03 upstream 72d3fcf802c4 58f15308 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/28 19:10 upstream 72d3fcf802c4 a7db5c9f .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/28 16:31 upstream 72d3fcf802c4 a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/28 06:01 upstream d266640c6c76 a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 23:27 upstream d266640c6c76 a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 23:27 upstream d266640c6c76 a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 22:36 upstream d266640c6c76 a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 22:35 upstream d266640c6c76 a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 17:16 upstream fd179f8a05be a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 16:58 upstream fd179f8a05be a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 16:57 upstream fd179f8a05be a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 16:57 upstream fd179f8a05be a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 13:03 upstream fd179f8a05be a3c7249d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 11:42 upstream fd179f8a05be a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 09:12 upstream fd179f8a05be a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/27 07:38 upstream fd179f8a05be a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/24 09:17 upstream 62f4c998b297 3c3cdf19 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/22 00:50 upstream f0100363d8c3 a8efa948 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/20 14:36 upstream 518e5b794c06 853b104b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/28 21:47 linux-next 6375e61c01e9 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/28 12:35 linux-next f5f84daefcd9 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
2026/09/29 08:47 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci e8e60d3ddd25 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-use-after-free Read in ecryptfs_write_tag_70_packet
* Struck through repros no longer work on HEAD.