{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-89910",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-11T19:38:34.774Z",
        "datePublished": "2026-09-16T10:32:07.951Z",
        "dateUpdated": "2026-10-19T08:54:43.786Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T08:54:43.786Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: KVM: Fix uninitialized stack variable issue with dmsintc\n\nVariable vector[] is declared on stack in function dmsintc_inject_irq()\nand sometimes it is used without initialized. Here fix this issue."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N",
                        "baseScore": 7.3,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The uninitialized vector[] is used in dmsintc_inject_irq(), called from kvm_deliver_intr() on KVM_RUN (kvm_pre_enter_guest) and KVM_GET_ONE_REG ESTAT after irqfd/KVM_SIGNAL_MSI or KVM_INTERRUPT queues INT_AVEC. That is a local /dev/kvm and guest MSI path, not a network or physical protocol handler.\nAC:L - A kvm-group VMM can create a MSGINT vCPU, queue INT_AVEC via KVM_INTERRUPT or irqfd MSI, then KVM_RUN or GET_ONE_REG ESTAT; any zero vector_map word leaves the matching stack slot uninitialized and typically nonzero. A guest retriggers the same inject on ordinary virtio/MSI I/O with no race.\nPR:L - kvm_dev_ioctl_create_vm() has no capable() check, so kvm-group (or equivalent) access is enough to create dmsintc, enable CPUCFG MSGINT, and inject AVEC. A LoongArch KVM tenant can also cause irqfd MSI injection and read guest ISR CSRs, which is Low privilege relative to the hypervisor, not init-namespace root.\nUI:N - The attacker issues KVM ioctls or guest device I/O themselves; no separate victim action such as mounting a filesystem or opening a file is required.\nS:C - dmsintc_inject_irq() writes host kernel stack contents into hardware guest ISR CSRs (LOONGARCH_CSR_ISR0-3) that the guest can read with csrrd and that the VMM can read after vcpu_put. That discloses hypervisor memory across the KVM guest-to-host boundary.\nC:H - Up to four uninitialized unsigned long stack slots are OR'd into guest-visible ISR registers on every AVEC injection. Repeated MSI or KVM_RUN samples resample kernel stack including pointers, matching CNA stack-leak scoring for KASLR defeat.\nI:L - The same uninitialized words are OR'd into guest ISR0-3, setting extra AVEC pending bits the VMM did not inject. That is limited corruption of guest interrupt-controller state, not an arbitrary host write or control-flow hijack.\nA:N - The uninitialized values are consumed only as ISR bitmasks via gcsr_write; they are not used as pointers and do not oops, panic, hang, or otherwise deny host service."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/loongarch/kvm/intc/dmsintc.c"
                    ],
                    "versions": [
                        {
                            "version": "03de5eecb0f0f68f29086bc0075c7fd597bf4e4a",
                            "lessThan": "f56060b0e10fa5633fac1dc243a25da3a5cdafb1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "03de5eecb0f0f68f29086bc0075c7fd597bf4e4a",
                            "lessThan": "81aa3a58b542ed88819115c80a17acd86eacb89d",
                            "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/loongarch/kvm/intc/dmsintc.c"
                    ],
                    "versions": [
                        {
                            "version": "7.1",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "7.1",
                            "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": "7.1",
                                    "versionEndExcluding": "7.2.5"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.1",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/f56060b0e10fa5633fac1dc243a25da3a5cdafb1"
                },
                {
                    "url": "https://git.kernel.org/stable/c/81aa3a58b542ed88819115c80a17acd86eacb89d"
                }
            ],
            "title": "LoongArch: KVM: Fix uninitialized stack variable issue with dmsintc",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}