Vulnerability-Lookup

FKIE_CVE-2026-31558

Vulnerability from fkie_nvd - Published: 2026-04-24 15:16 - Updated: 2026-06-17 10:33

Severity

8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust kvm_get_vcpu_by_cpuid() takes a cpuid parameter whose type is int, so cpuid can be negative. Let kvm_get_vcpu_by_cpuid() return NULL for this case so as to make it more robust. This fix an out-of-bounds access to kvm_arch::phyid_map::phys_map[].

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2db06c15d8c7a0ccb6108524e16cd9163753f354	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/47857b05bd50db01e211a1b6f513d57901cd3e6b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/596c3f8069c4792f22fce8c4452f44410032d910	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/878cf6acb4fd8ab4126cf9d369a5bb0e23123418	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.10
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/kvm/vcpu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "status": "affected",
              "version": "73516e9da512adc63ba3859fbd82a21f6257348f",
              "versionType": "git"
            },
            {
              "lessThan": "878cf6acb4fd8ab4126cf9d369a5bb0e23123418",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "version": "73516e9da512adc63ba3859fbd82a21f6257348f",
              "versionType": "git"
            },
            {
              "lessThan": "2db06c15d8c7a0ccb6108524e16cd9163753f354",
              "status": "affected",
              "version": "73516e9da512adc63ba3859fbd82a21f6257348f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/kvm/vcpu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "6.10"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "vulnerable": true
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              "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258",
              "vulnerable": true
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              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust\n\nkvm_get_vcpu_by_cpuid() takes a cpuid parameter whose type is int, so\ncpuid can be negative. Let kvm_get_vcpu_by_cpuid() return NULL for this\ncase so as to make it more robust.\n\nThis fix an out-of-bounds access to kvm_arch::phyid_map::phys_map[]."
    }
  ],
  "id": "CVE-2026-31558",
  "lastModified": "2026-06-17T10:33:58.553",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.0,
        "impactScore": 6.0,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-24T15:16:30.200",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/2db06c15d8c7a0ccb6108524e16cd9163753f354"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/47857b05bd50db01e211a1b6f513d57901cd3e6b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
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    },
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    }
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-31558 (GCVE-0-2026-31558)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:35 – Updated: 2026-08-05 12:23

Title

LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust

Summary

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

4 references

URL	Tags
https://git.kernel.org/stable/c/596c3f8069c4792f2…
https://git.kernel.org/stable/c/878cf6acb4fd8ab41…
https://git.kernel.org/stable/c/47857b05bd50db01e…
https://git.kernel.org/stable/c/2db06c15d8c7a0ccb…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 73516e9da512adc63ba3859fbd82a21f6257348f , < 596c3f8069c4792f22fce8c4452f44410032d910 (git) Affected: 73516e9da512adc63ba3859fbd82a21f6257348f , < 878cf6acb4fd8ab4126cf9d369a5bb0e23123418 (git) Affected: 73516e9da512adc63ba3859fbd82a21f6257348f , < 47857b05bd50db01e211a1b6f513d57901cd3e6b (git) Affected: 73516e9da512adc63ba3859fbd82a21f6257348f , < 2db06c15d8c7a0ccb6108524e16cd9163753f354 (git)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.12.80 , ≤ 6.12.* (semver) Unaffected: 6.18.21 , ≤ 6.18.* (semver) Unaffected: 6.19.11 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/kvm/vcpu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "596c3f8069c4792f22fce8c4452f44410032d910",
              "status": "affected",
              "version": "73516e9da512adc63ba3859fbd82a21f6257348f",
              "versionType": "git"
            },
            {
              "lessThan": "878cf6acb4fd8ab4126cf9d369a5bb0e23123418",
              "status": "affected",
              "version": "73516e9da512adc63ba3859fbd82a21f6257348f",
              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "73516e9da512adc63ba3859fbd82a21f6257348f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/kvm/vcpu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.19.11",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
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        }
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            "version": "3.1"
          },
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            {
              "lang": "en",
              "value": "AV:L - Exploitation requires local ability to run/control a LoongArch KVM guest or access KVM ioctls through `/dev/kvm`; the vulnerable code is not reachable directly over a network.\nAC:L - The attacker can directly supply the negative CPUID condition through guest hypercall register state or KVM interrupt-controller state, and no race or external timing condition is required.\nPR:L - The attacker needs access to a KVM VM or `/dev/kvm`, but the path does not require real host root or an init-namespace capability once KVM access is available.\nUI:N - No victim user action is required after the attacker can run the guest/KVM operation; the trigger is a direct hypercall or ioctl-driven interrupt-controller operation.\nS:C - The vulnerable component is host KVM, and a malicious guest or KVM user can affect host kernel memory, crossing the VM isolation boundary.\nC:H - The bug is an out-of-bounds access to the host kernel `phys_map` array, and under the required higher-severity rule this is treated as potentially exposing host kernel memory during exploitation.\nI:H - If the out-of-bounds entry is interpreted as an enabled vCPU, later interrupt-injection paths dereference and modify state through a bogus `struct kvm_vcpu` pointer, making host kernel memory corruption defensible.\nA:H - The reported failure includes UBSAN out-of-bounds warnings in host KVM, and attacker-controlled negative indices can reasonably cause host kernel oops, panic, or repeated denial of service."
            }
          ]
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        "dateUpdated": "2026-08-05T12:23:30.748Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        },
        {
          "url": "https://git.kernel.org/stable/c/2db06c15d8c7a0ccb6108524e16cd9163753f354"
        }
      ],
      "title": "LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31558",
    "datePublished": "2026-04-24T14:35:41.209Z",
    "dateReserved": "2026-03-09T15:48:24.116Z",
    "dateUpdated": "2026-08-05T12:23:30.748Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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FKIE_CVE-2026-31558

CVE-2026-31558 (GCVE-0-2026-31558)

Tags

Sightings

Nomenclature

Related by attack behaviour