blk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current()

{
  "id": "481755b0e696ee1ee512d5c2bef50b65cd798c5e3e8c88b163f2505ebdb3819a",
  "url": "https://osv.dev/vulnerability/CVE-2026-53126",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "blk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current() Add the missing put_disk() on the error path in blkcg_maybe_throttle_current(). When blkcg lookup, blkg lookup, or blkg_tryget() fails, the function jumps to the out label which only calls rcu_read_unlock() but does not release the disk reference acquired by blkcg_schedule_throttle() via get_device(). Since current->throttle_disk is already set to NULL before the lookup, blkcg_exit() cannot release this reference either, causing the disk to never be freed. Restore the reference release that was present as blk_put_queue() in the original code but was inadvertently dropped during the conversion from request_queue to gendisk.",
    "evidence": "osv:CVE-2026-53126",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.141",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.91",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.33",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-53126",
      "aliases": [
        "CVE-2026-53126"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f05837ed73d0c73e950b2d9f2612febb0d3d451e"
                },
                {
                  "fixed": "4048ed98860d3785645ebbd34f69566a6c7320c3"
                },
                {
                  "fixed": "73a5af059905d171b398c8b2381632ee499948b5"
                },
                {
                  "fixed": "b3e005f16cd98f815429a87aef4c61e9c140779f"
                },
                {
                  "fixed": "000e8454692cab9d1f1b80130e2870e355301d06"
                },
                {
                  "fixed": "23308af722fefed00af5f238024c11710938fba3"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53126.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.3.0"
                },
                {
                  "fixed": "6.6.141"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.91"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.33"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53126.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:43.961711968Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/000e8454692cab9d1f1b80130e2870e355301d06",
        "https://git.kernel.org/stable/c/23308af722fefed00af5f238024c11710938fba3",
        "https://git.kernel.org/stable/c/4048ed98860d3785645ebbd34f69566a6c7320c3",
        "https://git.kernel.org/stable/c/73a5af059905d171b398c8b2381632ee499948b5",
        "https://git.kernel.org/stable/c/b3e005f16cd98f815429a87aef4c61e9c140779f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53126.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53126",
        "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/2026/53xxx/CVE-2026-53126.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53126",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 511670,
  "published_at": "2026-06-24T16:30:54.594+00:00"
}