CVE-2026-64604

In the Linux kernel, the following vulnerability has been resolved:

KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode

When updating CR8 intercepts, get vmcs12 if and only if the vCPU is in

guest mode so that a future change can have update CR8 intercepts during

vCPU creation, without running afoul of get_vmcs12()'s lockdep assertion.

------------[ cut here ]------------

debug_locks && !(lock_is_held(&(&vcpu->mutex)->dep_map) || !refcount_read(&vcpu->kvm->users_count))

WARNING: arch/x86/kvm/vmx/nested.h:61 at get_vmcs12 arch/x86/kvm/vmx/nested.h:60 [inline], CPU#0: syz.2.19/5879

WARNING: arch/x86/kvm/vmx/nested.h:61 at vmx_update_cr8_intercept+0x3de/0x4e0 arch/x86/kvm/vmx/vmx.c:6879, CPU#0: syz.2.19/5879

Modules linked in:

CPU: 0 UID: 0 PID: 5879 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full)

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014

RIP: 0010:get_vmcs12 arch/x86/kvm/vmx/nested.h:60 [inline]

RIP: 0010:vmx_update_cr8_intercept+0x3de/0x4e0 arch/x86/kvm/vmx/vmx.c:6879

Call Trace:

<TASK>

apic_update_ppr arch/x86/kvm/lapic.c:984 [inline]

kvm_lapic_reset+0x1c24/0x2980 arch/x86/kvm/lapic.c:3023

kvm_vcpu_reset+0x44c/0x1bf0 arch/x86/kvm/x86.c:12986

kvm_arch_vcpu_create+0x746/0x8b0 arch/x86/kvm/x86.c:12847

kvm_vm_ioctl_create_vcpu+0x428/0x930 virt/kvm/kvm_main.c:4201

kvm_vm_ioctl+0x893/0xd50 virt/kvm/kvm_main.c:5159

vfs_ioctl fs/ioctl.c:51 [inline]

__do_sys_ioctl fs/ioctl.c:597 [inline]

__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583

do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94

entry_SYSCALL_64_after_hwframe+0x77/0x7f

</TASK>

No functional change intended.