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

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-6.6	KASAN: slab-out-of-bounds Write in __bpf_get_stackid origin:lts-only	21	C		inconclusive	9	14m	180d	0/2	upstream: reported C repro on 2025/08/11 20:18
android-6-1	KASAN: slab-out-of-bounds Write in __bpf_get_stackid origin:lts	21	C			14	2h33m	3d19h	0/2	upstream: reported C repro on 2026/02/05 00:19
upstream	KASAN: slab-out-of-bounds Write in __bpf_get_stackid bpf	21	C	error		170	100d	194d	29/29	fixed on 2026/01/07 12:29

================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274 Write of size 40 at addr ffff88805c2bff90 by task syz.0.17/4434 CPU: 1 PID: 4434 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Call Trace: <IRQ> 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x235/0x290 mm/kasan/generic.c:189 memcpy+0x3c/0x60 mm/kasan/shadow.c:66 __bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline] bpf_get_stackid_pe+0x33f/0x400 kernel/bpf/stackmap.c:334 bpf_prog_fa73c8c086b491e8+0x21/0x31 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:607 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_overflow_handler+0x522/0x7c0 kernel/events/core.c:10286 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496 perf_swevent_hrtimer+0x3ef/0x590 kernel/events/core.c:10927 __run_hrtimer kernel/time/hrtimer.c:1747 [inline] __hrtimer_run_queues+0x521/0xd70 kernel/time/hrtimer.c:1811 hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1873 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline] __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:perf_ioctl+0x2119/0x2420 kernel/events/core.c:-1 Code: 8d 08 45 31 ff 4c 8b 74 24 10 e9 c9 fe ff ff e8 cd 2b da ff 49 c7 c7 ea ff ff ff 4c 8b 74 24 10 41 c6 46 16 f8 41 c6 46 1a f8 <48> 8b 9c 24 98 00 00 00 48 89 df 48 83 c7 48 e8 43 3c 8d 08 48 89 RSP: 0018:ffffc90003457c20 EFLAGS: 00010246 RAX: ffffffff81a83534 RBX: 0000000000000000 RCX: ffff888026905940 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003457ed8 R08: ffff8880300f3007 R09: 1ffff1100601e600 R10: dffffc0000000000 R11: ffffed100601e601 R12: 0000000040042408 R13: f8f8f8f8f8f8f8f8 R14: fffff5200068af98 R15: 0000000000000000 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856 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: 0033:0x7f8d4a59aeb9 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:00007ffe90012818 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f8d4a815fa0 RCX: 00007f8d4a59aeb9 RDX: 0000000000000004 RSI: 0000000040042408 RDI: 0000000000000005 RBP: 00007f8d4a608c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8d4a815fac R14: 00007f8d4a815fa0 R15: 00007f8d4a815fa0 </TASK> Allocated by task 4434: 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+0xb0/0x240 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+0x390/0x520 kernel/bpf/stackmap.c:117 find_and_alloc_map kernel/bpf/syscall.c:133 [inline] map_create+0x534/0x1000 kernel/bpf/syscall.c:1149 __sys_bpf+0x38b/0x780 kernel/bpf/syscall.c:5012 __do_sys_bpf kernel/bpf/syscall.c:5134 [inline] __se_sys_bpf kernel/bpf/syscall.c:5132 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132 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 ffff88805c2bff80 which belongs to the cache kmalloc-cg-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff88805c2bff80, ffff88805c2bffc0) The buggy address belongs to the physical page: page:ffffea000170afc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5c2bf memcg:ffff888018ec4401 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888017442780 raw: 0000000000000000 0000000080200020 00000001ffffffff ffff888018ec4401 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4361, tgid 4361 (syz-executor), ts 81088929469, free_ts 81070822181 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559 prep_new_page mm/page_alloc.c:2566 [inline] get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5643 alloc_slab_page+0x5d/0x160 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node+0xa0/0x240 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0x6c/0x180 mm/util.c:581 kvmalloc include/linux/slab.h:716 [inline] kvzalloc include/linux/slab.h:724 [inline] allocate_hook_entries_size net/netfilter/core.c:61 [inline] nf_hook_entries_grow+0x309/0x730 net/netfilter/core.c:128 __nf_register_net_hook+0x2c9/0x910 net/netfilter/core.c:423 nf_register_net_hook+0xae/0x190 net/netfilter/core.c:566 nf_register_net_hooks+0x40/0x1a0 net/netfilter/core.c:582 ops_init+0x355/0x5f0 net/core/net_namespace.c:138 setup_net+0x4f2/0xbd0 net/core/net_namespace.c:336 copy_net_ns+0x348/0x5b0 net/core/net_namespace.c:508 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1486 [inline] free_pcp_prepare mm/page_alloc.c:1536 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3554 release_pages+0x1fa6/0x2220 mm/swap.c:1035 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu+0x105/0x220 mm/mmu_gather.c:261 tlb_finish_mmu+0xbd/0x1c0 mm/mmu_gather.c:361 exit_mmap+0x384/0x960 mm/mmap.c:3262 __mmput+0x118/0x3c0 kernel/fork.c:1205 exit_mm+0x1fe/0x2d0 kernel/exit.c:565 do_exit+0x905/0x2480 kernel/exit.c:867 do_group_exit+0x217/0x2d0 kernel/exit.c:1022 get_signal+0x1272/0x1350 kernel/signal.c:2871 arch_do_signal_or_restart+0xc4/0x1350 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 Memory state around the buggy address: ffff88805c2bfe80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff88805c2bff00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff88805c2bff80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88805c2c0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805c2c0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: 8d 08 lea (%rax),%ecx 2: 45 31 ff xor %r15d,%r15d 5: 4c 8b 74 24 10 mov 0x10(%rsp),%r14 a: e9 c9 fe ff ff jmp 0xfffffed8 f: e8 cd 2b da ff call 0xffda2be1 14: 49 c7 c7 ea ff ff ff mov $0xffffffffffffffea,%r15 1b: 4c 8b 74 24 10 mov 0x10(%rsp),%r14 20: 41 c6 46 16 f8 movb $0xf8,0x16(%r14) 25: 41 c6 46 1a f8 movb $0xf8,0x1a(%r14) * 2a: 48 8b 9c 24 98 00 00 mov 0x98(%rsp),%rbx <-- trapping instruction 31: 00 32: 48 89 df mov %rbx,%rdi 35: 48 83 c7 48 add $0x48,%rdi 39: e8 43 3c 8d 08 call 0x88d3c81 3e: 48 rex.W 3f: 89 .byte 0x89

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/02/08 05:29	linux-6.1.y	0182cb5b74ee	4c131dc4	.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 __bpf_get_stackid

Crashes (1):

Assets (help?)