kvm_intel: 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: 1 PID: 6474 at arch/x86/kvm/x86.c:11563 kvm_arch_vcpu_ioctl_run+0x11da/0x18c0 arch/x86/kvm/x86.c:11563
Modules linked in:
CPU: 1 UID: 0 PID: 6474 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:kvm_arch_vcpu_ioctl_run+0x11da/0x18c0 arch/x86/kvm/x86.c:11563
Code: 24 10 45 85 f6 7e 36 e8 84 44 79 00 49 bd 00 00 00 00 00 fc ff df 4c 8b 64 24 08 4c 8b 7c 24 28 e9 a0 fd ff ff e8 66 44 79 00 <0f> 0b e9 5e fd ff ff e8 5a 44 79 00 0f 0b e9 88 fd ff ff e8 4e 44
RSP: 0018:ffffc9000429f9e0 EFLAGS: 00010293
RAX: ffffffff81456c3a RBX: ffff888032430000 RCX: ffff88807fd40000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000429fc90 R08: ffff888022c75960 R09: ffffffff81455c53
R10: dffffc0000000000 R11: fffffbfff1eb0cc7 R12: ffff8880324300d8
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880740c4000
FS:  00007fd1013e16c0(0000) GS:ffff888126511000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000005200000c CR3: 0000000054c1c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kvm_vcpu_ioctl+0x95c/0xe90 virt/kvm/kvm_main.c:4466
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x8a/0x300 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd10058eba9
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:00007fd1013e1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd1007d5fa0 RCX: 00007fd10058eba9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007fd100611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd1007d6038 R14: 00007fd1007d5fa0 R15: 00007fff3d18ced8
 </TASK>