{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98719",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.366Z",
        "datePublished": "2026-10-18T15:46:54.631Z",
        "dateUpdated": "2026-10-19T09:24:30.132Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:24:30.132Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Nullify \"have run CPUs\" mask pointer when freeing it\n\nNullify have_run_cpus when freeing the mask, particularly in the error path\nof __sev_guest_init(), so that KVM doesn't have to subtly use sev->active\nto track whether or not the mask has been freed.  As pointed out by Sashiko,\nblindly freeing the mask in sev_vm_destroy() results in a double-free if\nthe mask is freed if __sev_guest_init() fails.\n\nThrow the logic in a helper as nullifying the pointer is frustratingly\ndifficult and weird due to have_run_cpus being a single-entry array when\nCPUMASK_OFFSTACK=n.  Deliberately don't use CPUMASK_VAR_NULL, as it's not\ndirectly assignable when the cpumask is on-stack, e.g. requires using a\nlocal variable and a memcpy(), which is beyond ridiculous.  Furthermore,\nwhile clearing the on-stack bitmask is an unnecessary and arguably unwanted\nside effect, KVM absolutely relies on '0' being the \"null\" value given that\nthe struct is zero-allocated.\n\nOpportunistically add an alloc() helper to pair with free(); there are just\nenough call sites to make doing so worthwhile."
                }
            ],
            "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/sev.c"
                    ],
                    "versions": [
                        {
                            "version": "6aef7cf800098749ff5d660222efaf6e01e98c09",
                            "lessThan": "b1de3ebf59507e0edacaa5cfa2225bc1869e1b63",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9784e5ca91b37b387f3f414af4340c54f7a63566",
                            "lessThan": "0fbc7fec2242de6c3dcea6de55573c428e820173",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "12c1f6e03f944e399bd2c88441dca5dc702b95a5",
                            "lessThan": "8abbc76120a74bfba1851bd97528099d715e45c6",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/kvm/svm/sev.c"
                    ],
                    "versions": [
                        {
                            "version": "6.18.55",
                            "lessThan": "6.18.56",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.9",
                            "lessThan": "7.2.10",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18.55",
                                    "versionEndExcluding": "6.18.56"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.2.9",
                                    "versionEndExcluding": "7.2.10"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/b1de3ebf59507e0edacaa5cfa2225bc1869e1b63"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0fbc7fec2242de6c3dcea6de55573c428e820173"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8abbc76120a74bfba1851bd97528099d715e45c6"
                }
            ],
            "title": "KVM: SEV: Nullify \"have run CPUs\" mask pointer when freeing it",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}