Qemu-kvm: heap off-by-one in kvm xen physdevop_map_pirq

{
  "id": "2aac014612c73cdba3e76aa864f96f5fe25bb035bc964a9fbc5e63faddd3a79b",
  "url": "https://osv.dev/vulnerability/CVE-2026-0665",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Qemu-kvm: heap off-by-one in kvm xen physdevop_map_pirq",
    "summary": "An off-by-one error was found in QEMU's KVM Xen guest support. A malicious guest could use this flaw to trigger out-of-bounds heap accesses in the QEMU process via the emulated Xen physdev hypercall interface, leading to a denial of service or potential memory corruption.",
    "evidence": "osv:CVE-2026-0665",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-0665",
      "aliases": [
        "CVE-2026-0665"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://gitlab.com/qemu-project/qemu",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c1eb2ddf0f8075faddc5f7c3d39feae3e8e9d6b4"
                },
                {
                  "last_affected": "698104725efad4b29079d857dfdebbd804e34c99"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "8.0.0"
                      },
                      {
                        "last_affected": "10.2.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v10.2.0",
            "v10.2.0-rc4",
            "v10.2.0-rc3",
            "v10.2.0-rc2",
            "v10.2.0-rc1",
            "v10.1.0",
            "v10.1.0-rc4",
            "v10.1.0-rc3",
            "v10.1.0-rc2",
            "v10.1.0-rc1",
            "v10.1.0-rc0",
            "v10.0.0",
            "v10.0.0-rc4",
            "v10.0.0-rc3",
            "v10.0.0-rc2",
            "v10.0.0-rc1",
            "v10.0.0-rc0",
            "v9.2.0",
            "v9.2.0-rc3",
            "v9.2.0-rc0",
            "v9.2.0-rc2",
            "v9.2.0-rc1",
            "v9.1.0",
            "v9.1.0-rc4",
            "v9.1.0-rc3",
            "v9.1.0-rc2",
            "v9.1.0-rc1",
            "v9.1.0-rc0",
            "v9.0.0",
            "v9.0.0-rc4",
            "v9.0.0-rc3",
            "v9.0.0-rc2",
            "v9.0.0-rc1",
            "v9.0.0-rc0",
            "v8.2.0",
            "v8.2.0-rc4",
            "v8.2.0-rc3",
            "v8.2.0-rc2",
            "v8.2.0-rc1",
            "v8.2.0-rc0",
            "v8.1.0",
            "v8.1.0-rc4",
            "v8.1.0-rc3",
            "v8.1.0-rc2",
            "v8.1.0-rc1",
            "v8.1.0-rc0",
            "v8.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-0665.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.668668993Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/downloads/content/package-browser/",
        "https://access.redhat.com/security/cve/CVE-2026-0665",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/0xxx/CVE-2026-0665.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-0665",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2428640",
        "https://gitlab.com/qemu-project/qemu"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-787"
        ],
        "cna_assigner": "fedora",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/0xxx/CVE-2026-0665.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-0665",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492409,
  "published_at": "2026-02-18T20:50:03.724+00:00"
}