Vulnerability-Lookup

GHSA-2MP2-FXXH-HV2J

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-24 18:32

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53126"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:27Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-2mp2-fxxh-hv2j",
  "modified": "2026-06-24T18:32:48Z",
  "published": "2026-06-24T18:32:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53126"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/000e8454692cab9d1f1b80130e2870e355301d06"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/23308af722fefed00af5f238024c11710938fba3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4048ed98860d3785645ebbd34f69566a6c7320c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73a5af059905d171b398c8b2381632ee499948b5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3e005f16cd98f815429a87aef4c61e9c140779f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-53126 (GCVE-0-2026-53126)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-24 16:30

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.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/4048ed98860d37856…
https://git.kernel.org/stable/c/73a5af059905d171b…
https://git.kernel.org/stable/c/b3e005f16cd98f815…
https://git.kernel.org/stable/c/000e8454692cab9d1…
https://git.kernel.org/stable/c/23308af722fefed00…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f05837ed73d0c73e950b2d9f2612febb0d3d451e , < 4048ed98860d3785645ebbd34f69566a6c7320c3 (git) Affected: f05837ed73d0c73e950b2d9f2612febb0d3d451e , < 73a5af059905d171b398c8b2381632ee499948b5 (git) Affected: f05837ed73d0c73e950b2d9f2612febb0d3d451e , < b3e005f16cd98f815429a87aef4c61e9c140779f (git) Affected: f05837ed73d0c73e950b2d9f2612febb0d3d451e , < 000e8454692cab9d1f1b80130e2870e355301d06 (git) Affected: f05837ed73d0c73e950b2d9f2612febb0d3d451e , < 23308af722fefed00af5f238024c11710938fba3 (git)
Linux	Linux	Affected: 6.3 Unaffected: 0 , < 6.3 (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/blk-cgroup.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
              "version": "f05837ed73d0c73e950b2d9f2612febb0d3d451e",
              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
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              "versionType": "git"
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            {
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "block/blk-cgroup.c"
          ],
          "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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              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "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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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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        {
          "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"
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        },
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        },
        {
          "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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-2MP2-FXXH-HV2J

CVE-2026-53126 (GCVE-0-2026-53126)

Tags

Sightings

Nomenclature