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: 0 PID: 5941 at arch/x86/kvm/x86.c:11233 kvm_arch_vcpu_ioctl_run+0xfdc/0x16a0 arch/x86/kvm/x86.c:11233
Modules linked in:
CPU: 0 PID: 5941 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:kvm_arch_vcpu_ioctl_run+0xfdc/0x16a0 arch/x86/kvm/x86.c:11233
Code: bf 01 00 00 00 89 c6 e8 82 8c 74 00 45 85 f6 7e 46 e8 c8 88 74 00 49 bd 00 00 00 00 00 fc ff df e9 0a fe ff ff e8 b4 88 74 00 <0f> 0b e9 c7 fd ff ff e8 a8 88 74 00 0f 0b e9 f2 fd ff ff e8 9c 88
RSP: 0018:ffffc900032d7a40 EFLAGS: 00010293
RAX: ffffffff8111078c RBX: ffff888026310000 RCX: ffff88802d2dbc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900032d7d10 R08: dffffc0000000000 R09: 1ffffffff21b4ebc
R10: dffffc0000000000 R11: fffffbfff21b4ebd R12: 1ffff11004c62124
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88801b77d000
FS:  000055556f133500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000005200000c CR3: 000000001fb4d000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kvm_vcpu_ioctl+0x88b/0xb80 virt/kvm/kvm_main.c:4162
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f97d058eba9
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:00007fff535a8978 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f97d07d5fa0 RCX: 00007f97d058eba9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f97d0611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f97d07d5fa0 R14: 00007f97d07d5fa0 R15: 0000000000000003
 </TASK>