KASAN: use-after-free Read in selinux_inode_follow

Date	Name	Commit	Repro	Result
2026/07/04	lts (merge base)	05968b6dd0ff	C	[report] lost connection to test machine
2026/07/04	upstream (ToT)	1e9cdc2ea15a	C	[report] lost connection to test machine

Created	Duration	User	Patch	Repo	Result
2026/07/14 20:31	26m	retest repro		android13-5.15-lts	log

Created

Duration

User

Patch

Repo

Result

2026/07/14 20:31

26m

retest repro

android13-5.15-lts

log

================================================================== BUG: KASAN: use-after-free in selinux_inode security/selinux/include/objsec.h:164 [inline] BUG: KASAN: use-after-free in __inode_security_revalidate security/selinux/hooks.c:270 [inline] BUG: KASAN: use-after-free in inode_security_rcu security/selinux/hooks.c:298 [inline] BUG: KASAN: use-after-free in selinux_inode_follow_link+0x134/0x370 security/selinux/hooks.c:3162 Read of size 8 at addr ffff888131d61f28 by task syz.1.3461/10735 CPU: 0 PID: 10735 Comm: syz.1.3461 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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+0x10f/0x150 mm/kasan/report.c:444 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 selinux_inode security/selinux/include/objsec.h:164 [inline] __inode_security_revalidate security/selinux/hooks.c:270 [inline] inode_security_rcu security/selinux/hooks.c:298 [inline] selinux_inode_follow_link+0x134/0x370 security/selinux/hooks.c:3162 security_inode_follow_link+0xb4/0x110 security/security.c:1323 pick_link+0x544/0xe00 fs/namei.c:1768 step_into+0xac8/0xce0 fs/namei.c:1840 walk_component+0x263/0x460 fs/namei.c:1990 link_path_walk+0x688/0xde0 fs/namei.c:-1 path_parentat fs/namei.c:2510 [inline] __filename_parentat+0x254/0x690 fs/namei.c:2534 filename_parentat fs/namei.c:2552 [inline] do_unlinkat+0xeb/0x6c0 fs/namei.c:4327 __do_sys_unlinkat fs/namei.c:4399 [inline] __se_sys_unlinkat fs/namei.c:4392 [inline] __x64_sys_unlinkat+0xd8/0xf0 fs/namei.c:4392 x64_sys_call+0x4c0/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:264 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: 0033:0x7fc8bf25ee59 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:00007fc8bf0a0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 00007fc8bf4d8090 RCX: 00007fc8bf25ee59 RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 0000000000000004 RBP: 00007fc8bf2f4e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc8bf4d8128 R14: 00007fc8bf4d8090 R15: 00007ffc75f2d6c8 </TASK> Allocated by task 10729: 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_slab_alloc+0xb7/0xe0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 alloc_inode fs/inode.c:266 [inline] new_inode_pseudo+0x7a/0x210 fs/inode.c:1011 new_inode+0x28/0x1e0 fs/inode.c:1040 bpf_get_inode kernel/bpf/inode.c:116 [inline] bpf_symlink+0x65/0x270 kernel/bpf/inode.c:394 vfs_symlink+0x29e/0x470 fs/namei.c:4437 do_symlinkat+0x24a/0x5d0 fs/namei.c:4466 __do_sys_symlinkat fs/namei.c:4483 [inline] __se_sys_symlinkat fs/namei.c:4480 [inline] __x64_sys_symlinkat+0x99/0xb0 fs/namei.c:4480 x64_sys_call+0x74b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:267 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 Freed by task 10729: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kmem_cache_free+0x100/0x320 mm/slub.c:3544 free_inode_nonrcu+0x1c/0x20 fs/inode.c:245 bpf_destroy_inode+0x14a/0x170 kernel/bpf/inode.c:621 destroy_inode fs/inode.c:314 [inline] evict+0x790/0x8b0 fs/inode.c:665 iput_final fs/inode.c:1779 [inline] iput+0x651/0x7e0 fs/inode.c:1805 do_unlinkat+0x380/0x6c0 fs/namei.c:4363 __do_sys_unlinkat fs/namei.c:4399 [inline] __se_sys_unlinkat fs/namei.c:4392 [inline] __x64_sys_unlinkat+0xd8/0xf0 fs/namei.c:4392 x64_sys_call+0x4c0/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:264 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 ffff888131d61ef0 which belongs to the cache inode_cache of size 752 The buggy address is located 56 bytes inside of 752-byte region [ffff888131d61ef0, ffff888131d621e0) The buggy address belongs to the page: page:ffffea0004c75800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x131d60 head:ffffea0004c75800 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea0004c75d00 0000000300000003 ffff8881001c4180 raw: 0000000000000000 0000000000120012 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 455, ts 29567507938, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 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] kmem_cache_alloc+0x138/0x260 mm/slub.c:3260 alloc_inode fs/inode.c:266 [inline] new_inode_pseudo+0x7a/0x210 fs/inode.c:1011 new_inode+0x28/0x1e0 fs/inode.c:1040 simple_fill_super+0xd1/0x5c0 fs/libfs.c:630 bpf_fill_super+0xb1/0x790 kernel/bpf/inode.c:769 vfs_get_super fs/super.c:1172 [inline] get_tree_nodev+0xb3/0x160 fs/super.c:1202 bpf_get_tree+0x1c/0x20 kernel/bpf/inode.c:785 vfs_get_tree+0x89/0x260 fs/super.c:1530 vfs_fsconfig_locked+0x236/0x3f0 fs/fsopen.c:238 page_owner free stack trace missing Memory state around the buggy address: ffff888131d61e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ffff888131d61e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fa fb >ffff888131d61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888131d61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888131d62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/06/28 21:05	android13-5.15-lts	c85054db4618	fb92f11c	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-android-5-15	KASAN: use-after-free Read in selinux_inode_follow_link

Crashes (1):

Assets (help?)