{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-43265",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-01T14:12:55.997Z",
        "datePublished": "2026-05-06T11:28:51.552Z",
        "dateUpdated": "2026-05-11T22:21:13.005Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T22:21:13.005Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Ignore -EBUSY when checking nested events from vcpu_block()\n\nIgnore -EBUSY when checking nested events after exiting a blocking state\nwhile L2 is active, as exiting to userspace will generate a spurious\nuserspace exit, usually with KVM_EXIT_UNKNOWN, and likely lead to the VM's\ndemise.  Continuing with the wakeup isn't perfect either, as *something*\nhas gone sideways if a vCPU is awakened in L2 with an injected event (or\nworse, a nested run pending), but continuing on gives the VM a decent\nchance of surviving without any major side effects.\n\nAs explained in the Fixes commits, it _should_ be impossible for a vCPU to\nbe put into a blocking state with an already-injected event (exception,\nIRQ, or NMI).  Unfortunately, userspace can stuff MP_STATE and/or injected\nevents, and thus put the vCPU into what should be an impossible state.\n\nDon't bother trying to preserve the WARN, e.g. with an anti-syzkaller\nKconfig, as WARNs can (hopefully) be added in paths where _KVM_ would be\nviolating x86 architecture, e.g. by WARNing if KVM attempts to inject an\nexception or interrupt while the vCPU isn't running."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/kvm/x86.c"
                    ],
                    "versions": [
                        {
                            "version": "26844fee6adee9b1557d2279b0506285de9ee82b",
                            "lessThan": "78265cd066d73a5cb41c088fcae4a2515e480d97",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "26844fee6adee9b1557d2279b0506285de9ee82b",
                            "lessThan": "ec3be7dc9391085a2d96700e159d66d1328b7ff6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "26844fee6adee9b1557d2279b0506285de9ee82b",
                            "lessThan": "2657439265d34a911886b916ba8be97ecc117d51",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "26844fee6adee9b1557d2279b0506285de9ee82b",
                            "lessThan": "1e88b5f854bdb469424132e0bb44793ad7a7c20a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "26844fee6adee9b1557d2279b0506285de9ee82b",
                            "lessThan": "1c957773063ed3264953597e32990a748381caf6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "26844fee6adee9b1557d2279b0506285de9ee82b",
                            "lessThan": "ead63640d4e72e6f6d464f4e31f7fecb79af8869",
                            "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/x86.c"
                    ],
                    "versions": [
                        {
                            "version": "6.1",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.1",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.167",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.130",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.77",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.17",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.6",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "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": "6.1",
                                    "versionEndExcluding": "6.1.167"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.1",
                                    "versionEndExcluding": "6.6.130"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.1",
                                    "versionEndExcluding": "6.12.77"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.1",
                                    "versionEndExcluding": "6.18.17"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.1",
                                    "versionEndExcluding": "6.19.6"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.1",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/78265cd066d73a5cb41c088fcae4a2515e480d97"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ec3be7dc9391085a2d96700e159d66d1328b7ff6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2657439265d34a911886b916ba8be97ecc117d51"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1e88b5f854bdb469424132e0bb44793ad7a7c20a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1c957773063ed3264953597e32990a748381caf6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ead63640d4e72e6f6d464f4e31f7fecb79af8869"
                }
            ],
            "title": "KVM: x86: Ignore -EBUSY when checking nested events from vcpu_block()",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}