null_blk: free global tag_set on init error path

{
  "id": "7417426d68e8c7f43b648950b1489b08448598d0da46eeff5ff2292ca3430d95",
  "url": "https://osv.dev/vulnerability/CVE-2026-90188",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "null_blk: free global tag_set on init error path",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: null_blk: free global tag_set on init error path If shared_tags is enabled, null_setup_tagset() allocates the global tag_set via null_init_global_tag_set(). If device creation later fails, err_dev destroys the default devices and calls unregister_blkdev(), but never frees the global tag_set. Since module init failed, null_exit() is never invoked, so the global tag_set's tags and maps are permanently leaked. Free the global tag_set in err_dev, matching null_exit() which does if (tag_set.ops) blk_mq_free_tag_set(&tag_set).",
    "evidence": "osv:CVE-2026-90188",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "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-2026-90188",
      "aliases": [
        "CVE-2026-90188"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "82f402fefa50f1675bf918bcd009981bd6b30ac8"
                },
                {
                  "fixed": "0b2faa330184340d9418ad2c627c2ae881772e33"
                },
                {
                  "fixed": "665c94554ff0d5d88caae7f40c16c8e0a3369eda"
                },
                {
                  "fixed": "2882e1450fa4597811a951196e07553ea134eb31"
                },
                {
                  "fixed": "2b59484ac1e64dd78dbe8c6140891c6308085a75"
                },
                {
                  "fixed": "081cf37e8a0e00cd91d6df53172c9d928790a798"
                },
                {
                  "fixed": "5a1c5ff3a49ba93a1fd0b70537e7a0164071760d"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90188.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.13.0"
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                {
                  "fixed": "6.1.188"
                }
              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
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                {
                  "fixed": "6.6.157"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.110"
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.13.0"
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                  "fixed": "6.18.52"
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            {
              "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-2026-90188.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.466891646Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/081cf37e8a0e00cd91d6df53172c9d928790a798",
        "https://git.kernel.org/stable/c/0b2faa330184340d9418ad2c627c2ae881772e33",
        "https://git.kernel.org/stable/c/2882e1450fa4597811a951196e07553ea134eb31",
        "https://git.kernel.org/stable/c/2b59484ac1e64dd78dbe8c6140891c6308085a75",
        "https://git.kernel.org/stable/c/5a1c5ff3a49ba93a1fd0b70537e7a0164071760d",
        "https://git.kernel.org/stable/c/665c94554ff0d5d88caae7f40c16c8e0a3369eda",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90188.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90188",
        "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-2026-90188.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90188",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493092,
  "published_at": "2026-09-17T16:07:10.349+00:00"
}