CVE-2026-89910 (GCVE-0-2026-89910)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 14:40
VLAI
Title
LoongArch: KVM: Fix uninitialized stack variable issue with dmsintc
Summary
In the Linux kernel, the following vulnerability has been resolved: LoongArch: KVM: Fix uninitialized stack variable issue with dmsintc Variable vector[] is declared on stack in function dmsintc_inject_irq() and sometimes it is used without initialized. Here fix this issue.
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 03de5eecb0f0f68f29086bc0075c7fd597bf4e4a , < f56060b0e10fa5633fac1dc243a25da3a5cdafb1 (git)
Affected: 03de5eecb0f0f68f29086bc0075c7fd597bf4e4a , < 81aa3a58b542ed88819115c80a17acd86eacb89d (git)
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Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/kvm/intc/dmsintc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "03de5eecb0f0f68f29086bc0075c7fd597bf4e4a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/kvm/intc/dmsintc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N",
            "version": "3.1"
          },
          "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\u0027d 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\u0027d 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T14:40:00.192Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89910",
    "datePublished": "2026-09-16T10:32:07.951Z",
    "dateReserved": "2026-09-11T19:38:34.774Z",
    "dateUpdated": "2026-09-16T14:40:00.192Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89910",
      "date": "2026-09-25",
      "epss": "0.00151",
      "percentile": "0.03532"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "arch/loongarch/kvm/intc/dmsintc.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "f56060b0e10fa5633fac1dc243a25da3a5cdafb1",
                    "status": "affected",
                    "version": "03de5eecb0f0f68f29086bc0075c7fd597bf4e4a",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "81aa3a58b542ed88819115c80a17acd86eacb89d",
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                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
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                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "7.1"
                  },
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                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
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                    "version": "7.2.5",
                    "versionType": "semver"
                  },
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                    "status": "unaffected",
                    "version": "7.3-rc1",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-89910",
        "lastModified": "2026-09-16T15:18:17.177",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "NONE",
                "baseScore": 7.3,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "LOW",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N",
                "version": "3.1"
              },
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              "impactScore": 4.7,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        "published": "2026-09-16T11:17:00.027",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/81aa3a58b542ed88819115c80a17acd86eacb89d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f56060b0e10fa5633fac1dc243a25da3a5cdafb1"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-19T01:43:07Z",
      "cve": "CVE-2026-89910",
      "id": "CVE-2026-89910",
      "initial_release_date": "2026-09-17T16:35:16Z",
      "product_status:known_not_affected": "347",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89910",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89910.json",
      "version": "3"
    }
  }
}



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