block: fix deadlock between bd_link_disk_holder and partition scan

{
  "id": "afee9d99715f094f8f67b8dee8e97c26149ad0fc1e3c5990fd04a7cb5300cf42",
  "url": "https://osv.dev/vulnerability/CVE-2024-26899",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "block: fix deadlock between bd_link_disk_holder and partition scan",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: block: fix deadlock between bd_link_disk_holder and partition scan 'open_mutex' of gendisk is used to protect open/close block devices. But in bd_link_disk_holder(), it is used to protect the creation of symlink between holding disk and slave bdev, which introduces some issues. When bd_link_disk_holder() is called, the driver is usually in the process of initialization/modification and may suspend submitting io. At this time, any io hold 'open_mutex', such as scanning partitions, can cause deadlocks. For example, in raid: T1 T2 bdev_open_by_dev lock open_mutex [1] ... efi_partition ... md_submit_bio md_ioctl mddev_syspend -> suspend all io md_add_new_disk bind_rdev_to_array bd_link_disk_holder try lock open_mutex [2] md_handle_request -> wait mddev_resume T1 scan partition, T2 add a new device to raid. T1 waits for T2 to resume mddev, but T2 waits for open_mutex held by T1. Deadlock occurs. Fix it by introducing a local mutex 'blk_holder_mutex' to replace 'open_mutex'.",
    "evidence": "osv:CVE-2024-26899",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.7.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.8.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-26899",
      "aliases": [
        "CVE-2024-26899"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1b0a2d950ee2a54aa04fb31ead32144be0bbf690"
                },
                {
                  "fixed": "1e5c5b0abaee7b62a10b9707a62083b71ad21f62"
                },
                {
                  "fixed": "5a87c1f7993bc8ac358a3766bac5dc7126e01e98"
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                {
                  "fixed": "03f12122b20b6e6028e9ed69030a49f9cffcbb75"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26899.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.7.11"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.8.0"
                },
                {
                  "fixed": "6.8.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26899.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:36.894766449Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/03f12122b20b6e6028e9ed69030a49f9cffcbb75",
        "https://git.kernel.org/stable/c/1e5c5b0abaee7b62a10b9707a62083b71ad21f62",
        "https://git.kernel.org/stable/c/5a87c1f7993bc8ac358a3766bac5dc7126e01e98",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26899.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-26899",
        "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/2024/26xxx/CVE-2024-26899.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-26899",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 504041,
  "published_at": "2024-04-17T10:27:49.089+00:00"
}