mtd: ubi: Release device reference on busy detach

{
  "id": "0a036cb8af890a81cc66d601d5d91991b42b3ee535bbbbc7f83fa38355a24ada",
  "url": "https://osv.dev/vulnerability/CVE-2026-90215",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mtd: ubi: Release device reference on busy detach",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mtd: ubi: Release device reference on busy detach ubi_detach_mtd_dev() obtains a device reference through ubi_get_device() before checking whether the UBI device is busy. The busy return path drops ubi->ref_count but leaves the device reference held, so the device object cannot be released after a later detach. Drop the device reference before returning -EBUSY.",
    "evidence": "osv:CVE-2026-90215",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-90215",
      "aliases": [
        "CVE-2026-90215"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "7e84c961b2eb062d2f47037dcca52dcd1d3615b5"
                },
                {
                  "fixed": "87812858c4c8df979cb70bcd0040b925a543df6f"
                },
                {
                  "fixed": "e065960366b55ab21e6c643c30dec2a41451900b"
                },
                {
                  "fixed": "851c5e9a829d56cb0982965f07ef8966a6722884"
                },
                {
                  "fixed": "31dd710cd84d5dd63c49f640d3a9f36c9699ca95"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90215.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.9.0"
                },
                {
                  "fixed": "6.12.110"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.52"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90215.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.494623374Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/31dd710cd84d5dd63c49f640d3a9f36c9699ca95",
        "https://git.kernel.org/stable/c/851c5e9a829d56cb0982965f07ef8966a6722884",
        "https://git.kernel.org/stable/c/87812858c4c8df979cb70bcd0040b925a543df6f",
        "https://git.kernel.org/stable/c/e065960366b55ab21e6c643c30dec2a41451900b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90215.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90215",
        "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/2026/90xxx/CVE-2026-90215.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90215",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 508216,
  "published_at": "2026-09-17T16:07:28.071+00:00"
}