L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
BUG: kernel NULL pointer dereference, address: 0000000000000086
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1f053b067 P4D 1f053b067 PUD 1f053c067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 362 Comm: syz-executor359 Not tainted 5.4.268-syzkaller-00003-g2d5d8240a7cb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:0x86
Code: Bad RIP value.
RSP: 0018:ffff8881dc227308 EFLAGS: 00010086
RAX: ffff8881dc227338 RBX: dffffc0000000000 RCX: ffff8881de2fcec0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000ec0 R08: ffffffff82315341 R09: ffffffff811c9085
R10: ffff8881de2fcec0 R11: 0000000000000002 R12: ffffffff84601550
R13: fffffe0000000ec8 R14: ffff8881ef508000 R15: fffffe0000000ecb
FS:  0000555556226380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000005c CR3: 00000001dc196000 CR4: 00000000003426b0
Call Trace:
Modules linked in:
CR2: 0000000000000086
---[ end trace c8e1c6afd73300a2 ]---
RIP: 0010:0x86
Code: Bad RIP value.
RSP: 0018:ffff8881dc227308 EFLAGS: 00010086
RAX: ffff8881dc227338 RBX: dffffc0000000000 RCX: ffff8881de2fcec0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000ec0 R08: ffffffff82315341 R09: ffffffff811c9085
R10: ffff8881de2fcec0 R11: 0000000000000002 R12: ffffffff84601550
R13: fffffe0000000ec8 R14: ffff8881ef508000 R15: fffffe0000000ecb
FS:  0000555556226380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000005c CR3: 00000001dc196000 CR4: 00000000003426b0