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 1dbcef067 P4D 1dbcef067 PUD 1dbcf0067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 356 Comm: syz-executor622 Not tainted 5.4.274-syzkaller-00002-g6f97bd951d82 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:0x86
Code: Bad RIP value.
RSP: 0018:ffff8881e1117308 EFLAGS: 00010086
RAX: ffff8881e1117338 RBX: dffffc0000000000 RCX: ffff8881dbe42f40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000290 R08: ffffffff82316ca1 R09: ffffffff811c90d5
R10: ffff8881dbe42f40 R11: 0000000000000002 R12: ffffffff84600238
R13: fffffe0000000298 R14: ffff8881db988000 R15: fffffe000000029b
FS:  0000555556711380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000005c CR3: 00000001dbce0000 CR4: 00000000003426b0
Call Trace:
Modules linked in:
CR2: 0000000000000086
---[ end trace f865d7e2323d62c6 ]---
RIP: 0010:0x86
Code: Bad RIP value.
RSP: 0018:ffff8881e1117308 EFLAGS: 00010086
RAX: ffff8881e1117338 RBX: dffffc0000000000 RCX: ffff8881dbe42f40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000290 R08: ffffffff82316ca1 R09: ffffffff811c90d5
R10: ffff8881dbe42f40 R11: 0000000000000002 R12: ffffffff84600238
R13: fffffe0000000298 R14: ffff8881db988000 R15: fffffe000000029b
FS:  0000555556711380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000005c CR3: 00000001dbce0000 CR4: 00000000003426b0