KASAN: null-ptr-deref Write in send_to

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
d5785e15-8fbb-40ec-b7dd-ae5973afe131	assessment-security		💥	KASAN: null-ptr-deref Write in send_to_lecd	2026/05/15 06:10	2026/05/15 06:10	2026/05/15 06:11	6ccb967e465e832a7bfd7a116ad00d52a0923a5d	failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 128 From /app/workdir/repo/linux * branch HEAD -> FETCH_HEAD Updating files: 21% (19663/93011) Updating files: 22% (20463/93011) Updating files: 23% (21393/93011) Updating files: 24% (22323/93011) Updating files: 25% (23253/93011) error: unable to write file arch/powerpc/include/asm/ehv_pic.h error: unable to write file arch/powerpc/include/asm/elf.h error: unable to write file arch/powerpc/include/asm/elfnote.h error: unable to write file arch/powerpc/include/asm/emergency-restart.h error: unable to write file arch/powerpc/include/asm/emulated_ops.h error: unable to write file arch/powerpc/include/asm/epapr_hcalls.h error: unable to write file arch/powerpc/include/asm/exception-64e.h error: unable to write file arch/powerpc/include/asm/exception-64s.h error: unable to write file arch/powerpc/include/asm/exec.h error: unable to write file arch/powerpc/include/asm/extable.h error: unable to write file arch/powerpc/include/asm/fadump-internal.h error: unable to write file arch/powerpc/include/asm/fadump.h error: unable to write file arch/powerpc/include/asm/feature-fixups.h error: unable to write file arch/powerpc/include/asm/firmware.h error: unable to write file arch/powerpc/include/asm/fixmap.h error: unable to write file arch/powerpc/include/asm/floppy.h error: unable to write file arch/powerpc/include/asm/fprobe.h error: unable to write file arch/powerpc/include/asm/fpu.h error: unable to write file arch/powerpc/include/asm/fsl_gtm.h error: unable to write file arch/powerpc/include/asm/fsl_hcalls.h error: unable to write file arch/powerpc/include/asm/fsl_lbc.h error: unable to write file arch/powerpc/include/asm/fsl_pamu_stash.h error: unable to write file arch/powerpc/include/asm/fsl_pm.h error: unable to write file arch/powerpc/include/asm/ftrace.h error: unable to write file arch/powerpc/include/asm/futex.h error: unable to write file arch/powerpc/include/asm/grackle.h error: unable to write file arch/powerpc/include/asm/guest-state-buffer.h error: unable to write file arch/powerpc/include/asm/hardirq.h error: unable to write file arch/powerpc/include/asm/head-64.h error: unable to write file arch/powerpc/include/asm/heathrow.h error: unable to write file arch/powerpc/include/asm/highmem.h error: unable to write file arch/powerpc/include/asm/hmi.h error: unable to write file arch/powerpc/include/asm/hugetlb.h error: unable to write file arch/powerpc/include/asm/hvcall.h error: unable to write file arch/powerpc/include/asm/hvconsole.h error: unable to write file arch/powerpc/include/asm/hvcserver.h error: unable to write file arch/powerpc/include/asm/hvsi.h error: unable to write file arch/powerpc/include/asm/hw_breakpoint.h error: unable to write file arch/powerpc/include/asm/hw_irq.h error: unable to write file arch/powerpc/include/asm/hydra.h error: unable to write file arch/powerpc/include/asm/i8259.h error: unable to write file arch/powerpc/include/asm/ibmebus.h error: unable to write file arch/powerpc/include/asm/icswx.h error: unable to write file arch/powerpc/include/asm/idle.h error: unable to write file arch/powerpc/include/asm/imc-pmu.h error: unable to write file arch/powerpc/include/asm/immap_cpm2.h error: unable to write file arch/powerpc/include/asm/inst.h error: unable to write file arch/powerpc/include/asm/interrupt.h error: unable to write file arch/powerpc/include/asm/io-defs.h error: unable to write file arch/powerpc/include/asm/io.h error: unable to write file arch/powerpc/include/asm/io_event_irq.h error: unable to write file arch/powerpc/include/asm/iommu.h error: unable to write file arch/powerpc/include/asm/ipic.h error: unable to write file arch/powerpc/include/asm/irq.h error: unable to write file arch/powerpc/include/asm/irq_work.h error: unable to write file arch/powerpc/include/asm/irqflags.h error: unable to write file arch/powerpc/include/asm/isa-bridge.h error: unable to write file arch/powerpc/include/asm/jump_label.h error: unable to write file arch/powerpc

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[syzbot] [net?] KASAN: null-ptr-deref Write in send_to_lecd	0 (1)	2026/03/09 12:13

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[syzbot] [net?] KASAN: null-ptr-deref Write in send_to_lecd

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2026/03/09 12:13

================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:112 [inline] BUG: KASAN: null-ptr-deref in atomic_add include/linux/atomic/atomic-instrumented.h:104 [inline] BUG: KASAN: null-ptr-deref in atm_force_charge include/linux/atmdev.h:261 [inline] BUG: KASAN: null-ptr-deref in send_to_lecd+0x2ef/0x5e0 net/atm/lec.c:535 Write of size 4 at addr 0000000000000140 by task dhcpcd/28797 CPU: 1 UID: 101 PID: 28797 Comm: dhcpcd Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 kasan_report+0xdf/0x1e0 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:186 [inline] kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200 instrument_atomic_read_write include/linux/instrumented.h:112 [inline] atomic_add include/linux/atomic/atomic-instrumented.h:104 [inline] atm_force_charge include/linux/atmdev.h:261 [inline] send_to_lecd+0x2ef/0x5e0 net/atm/lec.c:535 lec_arp_resolve net/atm/lec.c:1791 [inline] lec_start_xmit+0x1252/0x2070 net/atm/lec.c:285 __netdev_start_xmit include/linux/netdevice.h:5292 [inline] netdev_start_xmit include/linux/netdevice.h:5301 [inline] xmit_one net/core/dev.c:3871 [inline] dev_hard_start_xmit+0x121/0x7d0 net/core/dev.c:3887 sch_direct_xmit+0x1b2/0xc60 net/sched/sch_generic.c:347 qdisc_restart net/sched/sch_generic.c:412 [inline] __qdisc_run+0x52d/0x1b10 net/sched/sch_generic.c:420 qdisc_run include/net/pkt_sched.h:120 [inline] qdisc_run include/net/pkt_sched.h:117 [inline] __dev_xmit_skb net/core/dev.c:4196 [inline] __dev_queue_xmit+0x196d/0x4800 net/core/dev.c:4802 dev_queue_xmit include/linux/netdevice.h:3384 [inline] packet_xmit+0x243/0x310 net/packet/af_packet.c:275 packet_snd net/packet/af_packet.c:3076 [inline] packet_sendmsg+0x32f4/0x53c0 net/packet/af_packet.c:3108 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] sock_write_iter+0x524/0x5a0 net/socket.c:1195 do_iter_readv_writev+0x6ee/0x920 fs/read_write.c:829 vfs_writev+0x360/0xe10 fs/read_write.c:1059 do_writev+0x28a/0x340 fs/read_write.c:1105 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f53f6e3c407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007fff9cf80170 EFLAGS: 00000202 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f53f6db2780 RCX: 00007f53f6e3c407 RDX: 0000000000000002 RSI: 00007fff9cf801d0 RDI: 0000000000000003 RBP: 0000000000000188 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff9cf80210 R13: 0000562512791790 R14: 00007fff9cf80260 R15: 00007fff9cf90430 </TASK> ==================================================================

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/03/09 00:06	upstream	014441d1e4b2	5cb44a80	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-kasan-gce-selinux-root	KASAN: null-ptr-deref Write in send_to_lecd
2026/03/06 14:27	net-next	e5e09233e8a9	41d8037d	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-net-kasan-gce	KASAN: null-ptr-deref Write in send_to_lecd

Crashes (2):

Assets (help?)