KASAN: slab-out-of-bounds Write in stack_map_get_build_id

Date	Name	Commit	Repro	Result
2026/09/12	linux-6.1.y (ToT)	cf82dcca9634	C	[report] KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/12	upstream (ToT)	5225b8eec4c9	C	Didn't crash

Date

Name

Commit

Repro

Result

2026/09/12

linux-6.1.y (ToT)

cf82dcca9634

[report] KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset

2026/09/12

upstream (ToT)

5225b8eec4c9

Didn't crash

Kernel	Title	Rank 🛈	Repro	Fix bisect	Count	Last	Reported	Patched	Status
linux-6.1	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset origin:lts-only	21	syz, C	done	3	356d	366d	3/3	fixed on 2026/01/11 15:32
linux-6.6	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset	21	syz, C		40	28d	68d	0/2	upstream: reported C repro on 2026/08/30 23:23
android-6-1	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset origin:lts	21	syz, C		107	4d04h	58d	0/2	upstream: reported C repro on 2026/09/09 23:40
linux-5.15	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset origin:lts-only	21	syz, C	unreliable	3	98d	367d	0/3	upstream: reported C repro on 2025/11/04 17:48

================================================================== BUG: KASAN: slab-out-of-bounds in stack_map_get_build_id_offset+0x849/0x9d0 kernel/bpf/stackmap.c:147 Write of size 4 at addr ffff88801fb5a330 by task syz.0.17/4438 CPU: 1 PID: 4438 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: <TASK> dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 stack_map_get_build_id_offset+0x849/0x9d0 kernel/bpf/stackmap.c:147 __bpf_get_stackid+0x55d/0x920 kernel/bpf/stackmap.c:250 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline] bpf_get_stackid_pe+0x33f/0x400 kernel/bpf/stackmap.c:334 bpf_prog_2414a5d5030ea31b+0x21/0x25 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:608 [inline] bpf_prog_run include/linux/filter.h:615 [inline] bpf_overflow_handler+0x50b/0x790 kernel/events/core.c:10331 __perf_event_overflow+0x457/0x630 kernel/events/core.c:9506 perf_swevent_overflow kernel/events/core.c:9589 [inline] perf_swevent_event+0x315/0x570 kernel/events/core.c:9640 do_perf_sw_event kernel/events/core.c:9753 [inline] ___perf_sw_event+0x498/0x6d0 kernel/events/core.c:9784 __perf_sw_event+0x135/0x260 kernel/events/core.c:9796 perf_sw_event include/linux/perf_event.h:1254 [inline] do_user_addr_fault+0x497/0xb20 arch/x86/mm/fault.c:1284 handle_page_fault arch/x86/mm/fault.c:1429 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0010:copy_user_short_string+0x24/0x40 arch/x86/lib/copy_user_64.S:243 Code: 90 90 90 90 90 90 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a 06 <88> 07 48 ff c6 48 ff c7 ff c9 75 f2 31 c0 0f 01 ca c3 8d 14 ca eb RSP: 0018:ffffc90003456f88 EFLAGS: 00050206 RAX: ffffffff84164730 RBX: 0000000000000003 RCX: 0000000000000003 RDX: 0000000000000003 RSI: ffff88801aaa866c RDI: 00000000000001c0 RBP: 0000000000000000 R08: ffff88801aaa866e R09: 1ffff110035550cd R10: dffffc0000000000 R11: ffffed10035550ce R12: 00007fffffffeffd R13: 0000000000000003 R14: 00000000000001c0 R15: ffff88801aaa866c copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] _copy_to_user+0xea/0x130 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:169 [inline] bpf_verifier_vlog+0x172/0x3a0 kernel/bpf/log.c:34 verbose+0x1f0/0x2b0 kernel/bpf/verifier.c:303 print_insn_state+0x125/0x1b0 kernel/bpf/verifier.c:930 do_check kernel/bpf/verifier.c:12520 [inline] do_check_common+0x54ce/0xc560 kernel/bpf/verifier.c:14962 do_check_main kernel/bpf/verifier.c:15025 [inline] bpf_check+0x3eb5/0x11010 kernel/bpf/verifier.c:15614 bpf_prog_load+0x100e/0x1530 kernel/bpf/syscall.c:2651 __sys_bpf+0x5b8/0x780 kernel/bpf/syscall.c:5032 __do_sys_bpf kernel/bpf/syscall.c:5136 [inline] __se_sys_bpf kernel/bpf/syscall.c:5134 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5134 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f9ac8b9e159 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:00007ffd59bfba08 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f9ac8e25fa0 RCX: 00007f9ac8b9e159 RDX: 0000000000000024 RSI: 0000200000000680 RDI: 0000000000000005 RBP: 00007f9ac8c3506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9ac8e25fac R14: 00007f9ac8e25fa0 R15: 00007f9ac8e25fa0 </TASK> Allocated by task 4438: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node+0xb2/0x240 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] __bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline] bpf_map_area_alloc+0x47/0xe0 kernel/bpf/syscall.c:341 prealloc_elems_and_freelist+0x86/0x1c0 kernel/bpf/stackmap.c:51 stack_map_alloc+0x386/0x510 kernel/bpf/stackmap.c:117 find_and_alloc_map kernel/bpf/syscall.c:133 [inline] map_create+0x524/0xff0 kernel/bpf/syscall.c:1149 __sys_bpf+0x38b/0x780 kernel/bpf/syscall.c:5014 __do_sys_bpf kernel/bpf/syscall.c:5136 [inline] __se_sys_bpf kernel/bpf/syscall.c:5134 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5134 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88801fb5a000 which belongs to the cache kmalloc-cg-1k of size 1024 The buggy address is located 816 bytes inside of 1024-byte region [ffff88801fb5a000, ffff88801fb5a400) The buggy address belongs to the physical page: page:ffffea00007ed600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fb58 head:ffffea00007ed600 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88807295b901 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001d78c00 dead000000000002 ffff88801744c000 raw: 0000000000000000 0000000080100010 00000001ffffffff ffff88807295b901 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3648, tgid 3648 (udevd), ts 29193479984, free_ts 29158476819 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 alloc_slab_page+0x5d/0x180 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2d0 mm/slub.c:1997 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc+0xa3/0x240 mm/slab_common.c:949 kmalloc_array include/linux/slab.h:615 [inline] kcalloc include/linux/slab.h:646 [inline] alloc_pipe_info+0x1f5/0x4a0 fs/pipe.c:812 get_pipe_inode fs/pipe.c:886 [inline] create_pipe_files+0x87/0x6b0 fs/pipe.c:918 __do_pipe_flags+0x46/0x1f0 fs/pipe.c:967 do_pipe2+0xa7/0x190 fs/pipe.c:1015 __do_sys_pipe2 fs/pipe.c:1033 [inline] __se_sys_pipe2 fs/pipe.c:1031 [inline] __x64_sys_pipe2+0x56/0x60 fs/pipe.c:1031 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509 free_slab mm/slub.c:2036 [inline] discard_slab mm/slub.c:2042 [inline] __unfreeze_partials+0x188/0x1e0 mm/slub.c:2591 put_cpu_partial+0x17c/0x250 mm/slub.c:2667 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x490 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+0x18b/0x2f0 mm/slub.c:3383 vm_area_alloc+0x20/0xe0 kernel/fork.c:460 __mmap_region mm/mmap.c:2753 [inline] mmap_region+0xcbc/0x1c50 mm/mmap.c:2916 do_mmap+0x9ce/0x10d0 mm/mmap.c:1436 vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:520 elf_map+0xfd/0x2f0 fs/binfmt_elf.c:371 elf_load+0x87/0x480 fs/binfmt_elf.c:393 load_elf_binary+0x10e4/0x2820 fs/binfmt_elf.c:1206 Memory state around the buggy address: ffff88801fb5a200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801fb5a280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88801fb5a300: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff88801fb5a380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801fb5a400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 89 d1 mov %edx,%ecx 8: 83 e2 07 and $0x7,%edx b: c1 e9 03 shr $0x3,%ecx e: 74 12 je 0x22 10: 4c 8b 06 mov (%rsi),%r8 13: 4c 89 07 mov %r8,(%rdi) 16: 48 8d 76 08 lea 0x8(%rsi),%rsi 1a: 48 8d 7f 08 lea 0x8(%rdi),%rdi 1e: ff c9 dec %ecx 20: 75 ee jne 0x10 22: 21 d2 and %edx,%edx 24: 74 10 je 0x36 26: 89 d1 mov %edx,%ecx 28: 8a 06 mov (%rsi),%al * 2a: 88 07 mov %al,(%rdi) <-- trapping instruction 2c: 48 ff c6 inc %rsi 2f: 48 ff c7 inc %rdi 32: ff c9 dec %ecx 34: 75 f2 jne 0x28 36: 31 c0 xor %eax,%eax 38: 0f 01 ca clac 3b: c3 ret 3c: 8d 14 ca lea (%rdx,%rcx,8),%edx 3f: eb .byte 0xeb

Crashes (23):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/09/29 14:56	linux-6.1.y	1a8763b93150	7bf4ea23	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/24 08:23	linux-6.1.y	1a8763b93150	0281b448	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/18 06:25	linux-6.1.y	1a8763b93150	8d7d05f1	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/18 00:00	linux-6.1.y	1a8763b93150	8d7d05f1	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/13 22:18	linux-6.1.y	cf82dcca9634	70a60e12	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/11 08:47	linux-6.1.y	cf82dcca9634	1fe56c0a	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/10 01:42	linux-6.1.y	cf82dcca9634	4e8b1cc6	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/10 00:42	linux-6.1.y	cf82dcca9634	4e8b1cc6	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/09 10:33	linux-6.1.y	cf82dcca9634	8387c273	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/07 16:37	linux-6.1.y	cf82dcca9634	680aa3e1	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/07 09:30	linux-6.1.y	cf82dcca9634	4f7b22a0	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/07 03:06	linux-6.1.y	cf82dcca9634	4f7b22a0	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/05 23:33	linux-6.1.y	cf82dcca9634	4f7b22a0	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/01 14:52	linux-6.1.y	d64a499eea6b	587f6b29	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/08/30 23:10	linux-6.1.y	d64a499eea6b	2f52988a	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/10/06 16:34	linux-6.1.y	a500ba24937a	f7710056	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/27 23:44	linux-6.1.y	1a8763b93150	a3c7249d	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/23 04:22	linux-6.1.y	1a8763b93150	5207b90e	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/23 04:22	linux-6.1.y	1a8763b93150	5207b90e	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/15 10:26	linux-6.1.y	1a8763b93150	81a27d1a	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/15 10:17	linux-6.1.y	1a8763b93150	81a27d1a	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/09/15 10:17	linux-6.1.y	1a8763b93150	81a27d1a	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset
2026/08/31 11:07	linux-6.1.y	d64a499eea6b	2f52988a	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan-perf	KASAN: slab-out-of-bounds Write in stack_map_get_build_id_offset

Crashes (23):

Assets (help?)

2026/09/29 14:56

linux-6.1.y