{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64604",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-64604"
  ],
  "published": "2026-08-06T07:14:03Z",
  "summary": "KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode\n\nWhen updating CR8 intercepts, get vmcs12 if and only if the vCPU is in\nguest mode so that a future change can have update CR8 intercepts during\nvCPU creation, without running afoul of get_vmcs12()'s lockdep assertion.\n\n  ------------[ cut here ]------------\n  debug_locks && !(lock_is_held(&(&vcpu->mutex)->dep_map) || !refcount_read(&vcpu->kvm->users_count))\n  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\n  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\n  Modules linked in:\n  CPU: 0 UID: 0 PID: 5879 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full)\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\n  RIP: 0010:get_vmcs12 arch/x86/kvm/vmx/nested.h:60 [inline]\n  RIP: 0010:vmx_update_cr8_intercept+0x3de/0x4e0 arch/x86/kvm/vmx/vmx.c:6879\n  Call Trace:\n   <TASK>\n   apic_update_ppr arch/x86/kvm/lapic.c:984 [inline]\n   kvm_lapic_reset+0x1c24/0x2980 arch/x86/kvm/lapic.c:3023\n   kvm_vcpu_reset+0x44c/0x1bf0 arch/x86/kvm/x86.c:12986\n   kvm_arch_vcpu_create+0x746/0x8b0 arch/x86/kvm/x86.c:12847\n   kvm_vm_ioctl_create_vcpu+0x428/0x930 virt/kvm/kvm_main.c:4201\n   kvm_vm_ioctl+0x893/0xd50 virt/kvm/kvm_main.c:5159\n   vfs_ioctl fs/ioctl.c:51 [inline]\n   __do_sys_ioctl fs/ioctl.c:597 [inline]\n   __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583\n   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n   </TASK>\n\nNo functional change intended.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64604"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c7cd3605244c924249dea32632e1bc3e89bda543"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9a21f1defd96c6301c5fb462a78eb51b191bd2dd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/570af5db081b87374594a00711ac5760d2ea6844"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/258ec63c0f281bf7b50f9de67c8e93b5b7be5ed4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3dcfb04dd43b16fa1240fc6487fff578ad57264c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/db8407b9fd06d857a4a5e8bcff1d086d13007711"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7ef78d71ca713d8c00f7c34ddcf276c808143f77"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z"
  }
}