CVE-2026-53126 (GCVE-0-2026-53126)
Vulnerability from cvelistv5
Published
2026-06-24 16:30
Modified
2026-06-24 16:30
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: f05837ed73d0c73e950b2d9f2612febb0d3d451e
Version: f05837ed73d0c73e950b2d9f2612febb0d3d451e
Version: f05837ed73d0c73e950b2d9f2612febb0d3d451e
Version: f05837ed73d0c73e950b2d9f2612febb0d3d451e
Version: f05837ed73d0c73e950b2d9f2612febb0d3d451e
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/blk-cgroup.c"
          ],
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
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              "status": "unaffected",
              "version": "0",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.141",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
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              ],
              "negate": false,
              "operator": "OR"
            }
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current()\n\nAdd the missing put_disk() on the error path in\nblkcg_maybe_throttle_current(). When blkcg lookup, blkg lookup, or\nblkg_tryget() fails, the function jumps to the out label which only\ncalls rcu_read_unlock() but does not release the disk reference acquired\nby blkcg_schedule_throttle() via get_device(). Since current-\u003ethrottle_disk\nis already set to NULL before the lookup, blkcg_exit() cannot release\nthis reference either, causing the disk to never be freed.\n\nRestore the reference release that was present as blk_put_queue() in the\noriginal code but was inadvertently dropped during the conversion from\nrequest_queue to gendisk."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:30:54.594Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4048ed98860d3785645ebbd34f69566a6c7320c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/73a5af059905d171b398c8b2381632ee499948b5"
        },
        {
          "url": "https://git.kernel.org/stable/c/b3e005f16cd98f815429a87aef4c61e9c140779f"
        },
        {
          "url": "https://git.kernel.org/stable/c/000e8454692cab9d1f1b80130e2870e355301d06"
        },
        {
          "url": "https://git.kernel.org/stable/c/23308af722fefed00af5f238024c11710938fba3"
        }
      ],
      "title": "blk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53126",
    "datePublished": "2026-06-24T16:30:54.594Z",
    "dateReserved": "2026-06-09T07:44:35.386Z",
    "dateUpdated": "2026-06-24T16:30:54.594Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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