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.
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WARNING: CPU: 0 PID: 4386 at arch/x86/kvm/vmx/vmx.c:1709 vmx_queue_exception+0x2d2/0x480
Modules linked in:
CPU: 0 PID: 4386 Comm: syz.0.15 Not tainted 5.15.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:vmx_queue_exception+0x2d2/0x480 arch/x86/kvm/vmx/vmx.c:1709
Code: 9e 01 00 00 e8 3f 74 5d 00 eb 0c e8 38 74 5d 00 eb 05 e8 31 74 5d 00 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f c3 e8 1e 74 5d 00 <0f> 0b e9 a2 fe ff ff 89 f9 80 e1 07 38 c1 0f 8c 55 fd ff ff e8 f5
RSP: 0018:ffffc9000114f558 EFLAGS: 00010293
RAX: ffffffff8122e652 RBX: 0000000000000001 RCX: ffff8880702d5940
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000114fc50 R08: ffffffff8122e4ee R09: fffffbfff1bd2c16
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888024a28000
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000080000000
FS:  00007fbf75d586c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000071c4e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inject_pending_event arch/x86/kvm/x86.c:9162 [inline]
 vcpu_enter_guest+0x8f5/0x9850 arch/x86/kvm/x86.c:9885
 vcpu_run arch/x86/kvm/x86.c:10157 [inline]
 kvm_arch_vcpu_ioctl_run+0xa5e/0x1f80 arch/x86/kvm/x86.c:10394
 kvm_vcpu_ioctl+0x7f0/0xcf0 virt/kvm/kvm_main.c:3893
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fbf76ad1299
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbf75d58048 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbf76c5ff80 RCX: 00007fbf76ad1299
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007fbf76b3e8e6 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fbf76c5ff80 R15: 00007fff41dc0398
 </TASK>