{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64604", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.799Z", "datePublished": "2026-08-06T07:13:55.718Z", "dateUpdated": "2026-08-17T04:58:27.506Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:58:27.506Z" }, "descriptions": [ { "lang": "en", "value": "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 \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 \n\nNo functional change intended." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/x86/kvm/vmx/vmx.c" ], "versions": [ { "version": "a7c0b07d570848e50fce4d31ac01313484d6b844", "lessThan": "c7cd3605244c924249dea32632e1bc3e89bda543", "status": "affected", "versionType": "git" }, { "version": "a7c0b07d570848e50fce4d31ac01313484d6b844", "lessThan": "9a21f1defd96c6301c5fb462a78eb51b191bd2dd", "status": "affected", "versionType": "git" }, { "version": "a7c0b07d570848e50fce4d31ac01313484d6b844", "lessThan": "570af5db081b87374594a00711ac5760d2ea6844", "status": "affected", "versionType": "git" }, { "version": "a7c0b07d570848e50fce4d31ac01313484d6b844", "lessThan": "ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a", "status": "affected", "versionType": "git" }, { "version": "a7c0b07d570848e50fce4d31ac01313484d6b844", "lessThan": "258ec63c0f281bf7b50f9de67c8e93b5b7be5ed4", "status": "affected", "versionType": "git" }, { "version": "a7c0b07d570848e50fce4d31ac01313484d6b844", "lessThan": "3dcfb04dd43b16fa1240fc6487fff578ad57264c", "status": "affected", "versionType": "git" }, { "version": "a7c0b07d570848e50fce4d31ac01313484d6b844", "lessThan": "db8407b9fd06d857a4a5e8bcff1d086d13007711", "status": "affected", "versionType": "git" }, { "version": "a7c0b07d570848e50fce4d31ac01313484d6b844", "lessThan": "7ef78d71ca713d8c00f7c34ddcf276c808143f77", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/x86/kvm/vmx/vmx.c" ], "versions": [ { "version": "3.18", "status": "affected" }, { "version": "0", "lessThan": "3.18", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.12.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c7cd3605244c924249dea32632e1bc3e89bda543" }, { "url": "https://git.kernel.org/stable/c/9a21f1defd96c6301c5fb462a78eb51b191bd2dd" }, { "url": "https://git.kernel.org/stable/c/570af5db081b87374594a00711ac5760d2ea6844" }, { "url": "https://git.kernel.org/stable/c/ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a" }, { "url": "https://git.kernel.org/stable/c/258ec63c0f281bf7b50f9de67c8e93b5b7be5ed4" }, { "url": "https://git.kernel.org/stable/c/3dcfb04dd43b16fa1240fc6487fff578ad57264c" }, { "url": "https://git.kernel.org/stable/c/db8407b9fd06d857a4a5e8bcff1d086d13007711" }, { "url": "https://git.kernel.org/stable/c/7ef78d71ca713d8c00f7c34ddcf276c808143f77" } ], "title": "KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode", "x_generator": { "engine": "bippy-1.2.0" } } } }