UBSAN: array-index-out-of-bounds in print_bpf_insn (2)

Status: upstream: reported C repro on 2026/08/20 01:33
Subsystems: bpf
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+3544d9b2a9206be8ba37@syzkaller.appspotmail.com
Fix commit: bpf: Reject invalid LDSX instruction in disassembly
Patched on: [ci-upstream-bpf-kasan-gce ci-upstream-linux-next-kasan-gce-root ci-upstream-rust-kasan-gce], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 11d, last: 11m
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
bde42590 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ UBSAN: array-index-out-of-bounds in print_bpf_insn (2) 2026/08/17 03:28 2026/08/17 03:28 2026/08/17 03:58 746171ee
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
Re: [PATCH] bpf: fix array-index-out-of-bounds in print_bpf_insn 1 (1) 2026/08/24 21:23
[PATCH bpf-next v1 1/2] bpf: Reject invalid LDSX instruction in disassembly 2 (2) 2026/08/20 05:23
[syzbot] [bpf?] UBSAN: array-index-out-of-bounds in print_bpf_insn (2) 0 (1) 2026/08/20 01:33
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream UBSAN: array-index-out-of-bounds in print_bpf_insn bpf 15 syz, C done 9 1121d 1123d 23/29 fixed on 2023/10/12 12:47
▶ ▼ Cause bisection attempts (1)
Created Duration User Patch Repo Result
2026/08/16 22:55 0m bisect bpf-next error

Sample crash report:
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in kernel/bpf/disasm.c:306:6
index 3 is out of range for type 'const char *const[3]'
CPU: 0 UID: 0 PID: 5622 Comm: syz-executor350 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xe8/0xf0 lib/ubsan.c:455
 print_bpf_insn+0x21f1/0x2910 kernel/bpf/disasm.c:306
 format_disasm_line kernel/bpf/diagnostics.c:633 [inline]
 diag_print_insn_context+0x433/0xd00 kernel/bpf/diagnostics.c:783
 bpf_diag_source+0x66a/0x1950 kernel/bpf/diagnostics.c:-1
 bpf_diag_program_structure+0x31c/0x430 kernel/bpf/diagnostics.c:1211
 check_subprogs+0x66b/0x740 kernel/bpf/verifier.c:3049
 bpf_check+0x17ba/0x2e10 kernel/bpf/verifier.c:21099
 bpf_prog_load+0x14d6/0x1c20 kernel/bpf/syscall.c:3133
 __sys_bpf+0xd0d/0xd90 kernel/bpf/syscall.c:6367
 __do_sys_bpf kernel/bpf/syscall.c:6486 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6483 [inline]
 __x64_sys_bpf+0xba/0xd0 kernel/bpf/syscall.c:6483
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe861ccec79
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe8118b7b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007ffe8118b8f8 RCX: 00007fe861ccec79
RDX: 0000000000000094 RSI: 0000200000000180 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe8118b8e8
R13: 0000000000000002 R14: 00007fe861d5fca0 R15: 0000000000000002
 </TASK>
---[ end trace ]---

Crashes (2433):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/16 08:05 bpf-next c93cbdb13f99 746171ee .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/16 07:30 bpf-next c93cbdb13f99 746171ee .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/16 06:09 bpf-next c93cbdb13f99 746171ee .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/16 04:56 bpf-next c93cbdb13f99 746171ee .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/16 03:39 bpf-next c93cbdb13f99 746171ee .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/24 21:37 upstream 0a0d1d55dad5 23caa175 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/23 22:18 upstream 388b607d107c 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/23 10:32 upstream 2709dd5ae32f 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/21 14:40 upstream 7f063b2f17ea 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 15:45 upstream 818bebeb63dd c53a1b9c .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 11:46 upstream 818bebeb63dd c53a1b9c .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 23:19 upstream 818bebeb63dd a2b77b9e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 20:30 upstream 818bebeb63dd a2b77b9e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 17:53 upstream 818bebeb63dd a2b77b9e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 16:46 upstream 818bebeb63dd a2b77b9e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 08:54 upstream 818bebeb63dd 6a91adb4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 02:48 upstream 818bebeb63dd 6a91adb4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/21 18:02 upstream 818bebeb63dd 1e72964b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 14:12 net 991c2be78257 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 09:51 net 991c2be78257 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 03:02 net f967455fb2a5 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 02:49 net f967455fb2a5 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 01:49 net f967455fb2a5 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 22:15 net f967455fb2a5 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 21:38 net f967455fb2a5 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 14:41 net dc4b95b8fee9 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 13:37 net dc4b95b8fee9 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 13:26 net dc4b95b8fee9 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 11:24 net dc4b95b8fee9 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 08:28 net dc4b95b8fee9 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 07:23 net dc4b95b8fee9 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 06:38 net dc4b95b8fee9 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 05:31 net dc4b95b8fee9 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 05:02 net dc4b95b8fee9 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 02:39 net dc4b95b8fee9 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 16:53 net-next 91ec20351349 e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 14:33 bpf-next 48b69cc8825d a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 13:03 bpf-next 48b69cc8825d a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 13:00 net-next 91ec20351349 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 10:59 bpf-next 48b69cc8825d a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 09:03 net-next 91ec20351349 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 07:59 net-next 91ec20351349 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 07:42 bpf-next 48b69cc8825d a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 06:41 bpf-next 48b69cc8825d a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 06:33 net-next 91ec20351349 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 05:28 net-next 91ec20351349 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 04:27 net-next 91ec20351349 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 04:05 bpf-next 48b69cc8825d a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 01:07 net-next 91ec20351349 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/27 00:06 net-next 91ec20351349 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 19:29 net-next 91ec20351349 a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 15:34 bpf-next 1555de33018f 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 12:26 bpf-next 1555de33018f 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 11:20 net-next 91ec20351349 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 10:00 bpf-next 1555de33018f 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 04:01 net-next 91ec20351349 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 01:30 bpf-next d83fba28c25e 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/26 00:21 bpf-next d83fba28c25e 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/21 14:44 linux-next 7079a12d7506 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root UBSAN: array-index-out-of-bounds in print_bpf_insn
2026/08/25 16:12 net-next 91ec20351349 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce KASAN: global-out-of-bounds Read in print_bpf_insn
* Struck through repros no longer work on HEAD.