Grub2: grub2: out-of-bounds write via malicious usb device

{
  "id": "d0608f8804d46026aeb4577f52ab96ec55fb67a39b2091373fbafee5599ce477",
  "url": "https://osv.dev/vulnerability/CVE-2025-61661",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Grub2: grub2: out-of-bounds write via malicious usb device",
    "summary": "A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component. This flaw occurs because the bootloader mishandles string conversion when reading information from a USB device, allowing an attacker to exploit inconsistent length values. A local attacker can connect a maliciously configured USB device during the boot sequence to trigger this issue. A successful exploitation may lead GRUB to crash, leading to a Denial of Service. Data corruption may be also possible, although given the complexity of the exploit the impact is most likely limited.",
    "evidence": "osv:CVE-2025-61661",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-61661",
      "aliases": [
        "CVE-2025-61661"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://https.git.savannah.gnu.org/git/grub.git/",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "d38d6a1a9b79427848976f53d474392cd29c2a71"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.14"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "grub-2.14",
            "grub-2.14-rc1",
            "grub-2.12",
            "grub-2.12-rc1",
            "grub-2.06",
            "grub-2.06-rc1a",
            "grub-2.06-rc1",
            "grub-2.04",
            "grub-2.04-rc1",
            "grub-2.02",
            "2.02",
            "grub-2.02-rc2",
            "2.02-rc2",
            "grub-2.02-rc1",
            "2.02-rc1",
            "grub-2.02-beta3",
            "2.02-beta3",
            "grub-2.02-beta2",
            "grub-2.02-beta1",
            "2.00",
            "1.99",
            "1.98"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-61661.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.366813426Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/downloads/content/package-browser/",
        "https://access.redhat.com/security/cve/CVE-2025-61661",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/61xxx/CVE-2025-61661.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-61661",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2413827",
        "https://git.savannah.gnu.org/git/grub.git"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-131"
        ],
        "cna_assigner": "redhat",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/61xxx/CVE-2025-61661.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-61661",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 522352,
  "published_at": "2025-11-18T18:20:42.151+00:00"
}