{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-89921",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-11T19:38:34.775Z",
        "datePublished": "2026-09-16T10:32:15.413Z",
        "dateUpdated": "2026-10-19T08:54:56.252Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T08:54:56.252Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Zero initialize data structures for inject_pfault_token\n\n__kvm_inject_pfault_token() only sets .type and .u.ext.ext_params2 of\nthe on-stack struct kvm_s390_irq but the full ext substructure is copied\ninto the cpu local variable on inject. ext_params and pad contain stale\nstack values.\n\nInterrupt delivery only uses ext_params2, so nothing leaks to the guest,\nbut a host user can use the migration ioctls to get to the data.\n\nFix by zero-initializing the irq struct.\nDo the same for the inti data structure."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/s390/kvm/kvm-s390.c"
                    ],
                    "versions": [
                        {
                            "version": "383d0b050106abecb82f43101cac94fa423af5cd",
                            "lessThan": "b8abc760fa18a389319d977834a30550b3ec18e8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "383d0b050106abecb82f43101cac94fa423af5cd",
                            "lessThan": "9b046de62b8098af6e2ba820b125ec9dc5f162c8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "383d0b050106abecb82f43101cac94fa423af5cd",
                            "lessThan": "134f235e0e8de54611a72d3cc3f63e5f31246baa",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "383d0b050106abecb82f43101cac94fa423af5cd",
                            "lessThan": "4e2c7f7cbc27418f9a290399b986c1b85ff93b90",
                            "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/s390/kvm/kvm-s390.c"
                    ],
                    "versions": [
                        {
                            "version": "3.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.112",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.52",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.5",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "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": "3.19",
                                    "versionEndExcluding": "6.12.112"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.19",
                                    "versionEndExcluding": "6.18.52"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.19",
                                    "versionEndExcluding": "7.2.5"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.19",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/b8abc760fa18a389319d977834a30550b3ec18e8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9b046de62b8098af6e2ba820b125ec9dc5f162c8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/134f235e0e8de54611a72d3cc3f63e5f31246baa"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4e2c7f7cbc27418f9a290399b986c1b85ff93b90"
                }
            ],
            "title": "KVM: s390: Zero initialize data structures for inject_pfault_token",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}