LoongArch: KVM: Handle the case that EIOINTC's coremap is empty

{
  "id": "211cf423dd54ed6f2600c55a48b8d299e44e6d48b922a904fc16c9ff3060168c",
  "url": "https://osv.dev/vulnerability/CVE-2026-31569",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "LoongArch: KVM: Handle the case that EIOINTC's coremap is empty",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: LoongArch: KVM: Handle the case that EIOINTC's coremap is empty EIOINTC's coremap in eiointc_update_sw_coremap() can be empty, currently we get a cpuid with -1 in this case, but we actually need 0 because it's similar as the case that cpuid >= 4. This fix an out-of-bounds access to kvm_arch::phyid_map::phys_map[].",
    "evidence": "osv:CVE-2026-31569",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.21",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-31569",
      "aliases": [
        "CVE-2026-31569"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3956a52bc05bd811082a3c9d2b423ee957e6fefc"
                },
                {
                  "fixed": "126053d0a685bf1f2e98db8966386f38b2336338"
                },
                {
                  "fixed": "2a0cbcd28ecf6e0b88fa498bebb94bd1be61a7c3"
                },
                {
                  "fixed": "b97bd69eb0f67b5f961b304d28e9ba45e202d841"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31569.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.21"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31569.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.046114346Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/126053d0a685bf1f2e98db8966386f38b2336338",
        "https://git.kernel.org/stable/c/2a0cbcd28ecf6e0b88fa498bebb94bd1be61a7c3",
        "https://git.kernel.org/stable/c/b97bd69eb0f67b5f961b304d28e9ba45e202d841",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31569.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31569",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31569.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-31569",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505000,
  "published_at": "2026-04-24T14:35:48.768+00:00"
}