{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2022-49559",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-02-26T02:08:31.591Z",
        "datePublished": "2025-02-26T02:14:05.059Z",
        "dateUpdated": "2026-05-11T19:02:17.480Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T19:02:17.480Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Drop WARNs that assert a triple fault never \"escapes\" from L2\n\nRemove WARNs that sanity check that KVM never lets a triple fault for L2\nescape and incorrectly end up in L1.  In normal operation, the sanity\ncheck is perfectly valid, but it incorrectly assumes that it's impossible\nfor userspace to induce KVM_REQ_TRIPLE_FAULT without bouncing through\nKVM_RUN (which guarantees kvm_check_nested_state() will see and handle\nthe triple fault).\n\nThe WARN can currently be triggered if userspace injects a machine check\nwhile L2 is active and CR4.MCE=0.  And a future fix to allow save/restore\nof KVM_REQ_TRIPLE_FAULT, e.g. so that a synthesized triple fault isn't\nlost on migration, will make it trivially easy for userspace to trigger\nthe WARN.\n\nClearing KVM_REQ_TRIPLE_FAULT when forcibly leaving guest mode is\ntempting, but wrong, especially if/when the request is saved/restored,\ne.g. if userspace restores events (including a triple fault) and then\nrestores nested state (which may forcibly leave guest mode).  Ignoring\nthe fact that KVM doesn't currently provide the necessary APIs, it's\nuserspace's responsibility to manage pending events during save/restore.\n\n  ------------[ cut here ]------------\n  WARNING: CPU: 7 PID: 1399 at arch/x86/kvm/vmx/nested.c:4522 nested_vmx_vmexit+0x7fe/0xd90 [kvm_intel]\n  Modules linked in: kvm_intel kvm irqbypass\n  CPU: 7 PID: 1399 Comm: state_test Not tainted 5.17.0-rc3+ #808\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n  RIP: 0010:nested_vmx_vmexit+0x7fe/0xd90 [kvm_intel]\n  Call Trace:\n   <TASK>\n   vmx_leave_nested+0x30/0x40 [kvm_intel]\n   vmx_set_nested_state+0xca/0x3e0 [kvm_intel]\n   kvm_arch_vcpu_ioctl+0xf49/0x13e0 [kvm]\n   kvm_vcpu_ioctl+0x4b9/0x660 [kvm]\n   __x64_sys_ioctl+0x83/0xb0\n   do_syscall_64+0x3b/0xc0\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n   </TASK>\n  ---[ end trace 0000000000000000 ]---"
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/kvm/svm/nested.c",
                        "arch/x86/kvm/vmx/nested.c"
                    ],
                    "versions": [
                        {
                            "version": "cb6a32c2b8777ad31a02e585584d869251a790e3",
                            "lessThan": "8d3a2aa0976f57320ba89baf9d57fb158dd0cd0d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cb6a32c2b8777ad31a02e585584d869251a790e3",
                            "lessThan": "f476a59d5c86c02a79eef893c6da86735f2977ac",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cb6a32c2b8777ad31a02e585584d869251a790e3",
                            "lessThan": "7de373c9b48229e428ecdb8fbde269c5a8617fd2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cb6a32c2b8777ad31a02e585584d869251a790e3",
                            "lessThan": "45846661d10422ce9e22da21f8277540b29eca22",
                            "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/svm/nested.c",
                        "arch/x86/kvm/vmx/nested.c"
                    ],
                    "versions": [
                        {
                            "version": "5.13",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.13",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.45",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.17.13",
                            "lessThanOrEqual": "5.17.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.18.2",
                            "lessThanOrEqual": "5.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.19",
                            "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": "5.13",
                                    "versionEndExcluding": "5.15.45"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.13",
                                    "versionEndExcluding": "5.17.13"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.13",
                                    "versionEndExcluding": "5.18.2"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.13",
                                    "versionEndExcluding": "5.19"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/8d3a2aa0976f57320ba89baf9d57fb158dd0cd0d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f476a59d5c86c02a79eef893c6da86735f2977ac"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7de373c9b48229e428ecdb8fbde269c5a8617fd2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/45846661d10422ce9e22da21f8277540b29eca22"
                }
            ],
            "title": "KVM: x86: Drop WARNs that assert a triple fault never \"escapes\" from L2",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}