{"id":"CVE-2026-64604","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-\u003emutex)-\u003edep_map) || !refcount_read(&vcpu-\u003ekvm-\u003eusers_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   \u003cTASK\u003e\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   \u003c/TASK\u003e\n\nNo functional change intended.","modified":"2026-08-08T03:48:18.998287862Z","published":"2026-08-06T07:13:55.718Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64604.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/258ec63c0f281bf7b50f9de67c8e93b5b7be5ed4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3dcfb04dd43b16fa1240fc6487fff578ad57264c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/570af5db081b87374594a00711ac5760d2ea6844"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ef78d71ca713d8c00f7c34ddcf276c808143f77"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9a21f1defd96c6301c5fb462a78eb51b191bd2dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c7cd3605244c924249dea32632e1bc3e89bda543"},{"type":"WEB","url":"https://git.kernel.org/stable/c/db8407b9fd06d857a4a5e8bcff1d086d13007711"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64604.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64604"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a7c0b07d570848e50fce4d31ac01313484d6b844"},{"fixed":"c7cd3605244c924249dea32632e1bc3e89bda543"},{"fixed":"9a21f1defd96c6301c5fb462a78eb51b191bd2dd"},{"fixed":"570af5db081b87374594a00711ac5760d2ea6844"},{"fixed":"ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a"},{"fixed":"258ec63c0f281bf7b50f9de67c8e93b5b7be5ed4"},{"fixed":"3dcfb04dd43b16fa1240fc6487fff578ad57264c"},{"fixed":"db8407b9fd06d857a4a5e8bcff1d086d13007711"},{"fixed":"7ef78d71ca713d8c00f7c34ddcf276c808143f77"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64604.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.18.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64604.json"}}],"schema_version":"1.8.0"}