GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

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

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-24 16:30
VLAI
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f05837ed73d0c73e950b2d9f2612febb0d3d451e , < 4048ed98860d3785645ebbd34f69566a6c7320c3 (git)
Affected: f05837ed73d0c73e950b2d9f2612febb0d3d451e , < 73a5af059905d171b398c8b2381632ee499948b5 (git)
Affected: f05837ed73d0c73e950b2d9f2612febb0d3d451e , < b3e005f16cd98f815429a87aef4c61e9c140779f (git)
Affected: f05837ed73d0c73e950b2d9f2612febb0d3d451e , < 000e8454692cab9d1f1b80130e2870e355301d06 (git)
Affected: f05837ed73d0c73e950b2d9f2612febb0d3d451e , < 23308af722fefed00af5f238024c11710938fba3 (git)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "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": [
            {
              "lessThan": "4048ed98860d3785645ebbd34f69566a6c7320c3",
              "status": "affected",
              "version": "f05837ed73d0c73e950b2d9f2612febb0d3d451e",
              "versionType": "git"
            },
            {
              "lessThan": "73a5af059905d171b398c8b2381632ee499948b5",
              "status": "affected",
              "version": "f05837ed73d0c73e950b2d9f2612febb0d3d451e",
              "versionType": "git"
            },
            {
              "lessThan": "b3e005f16cd98f815429a87aef4c61e9c140779f",
              "status": "affected",
              "version": "f05837ed73d0c73e950b2d9f2612febb0d3d451e",
              "versionType": "git"
            },
            {
              "lessThan": "000e8454692cab9d1f1b80130e2870e355301d06",
              "status": "affected",
              "version": "f05837ed73d0c73e950b2d9f2612febb0d3d451e",
              "versionType": "git"
            },
            {
              "lessThan": "23308af722fefed00af5f238024c11710938fba3",
              "status": "affected",
              "version": "f05837ed73d0c73e950b2d9f2612febb0d3d451e",
              "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"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "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
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53126",
      "date": "2026-09-16",
      "epss": "0.00114",
      "percentile": "0.01684"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-09T14:41:15.000Z",
      "cve": "CVE-2026-53126",
      "id": "msrc_CVE-2026-53126",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "blk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53126.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53126\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:27.900\",\"lastModified\":\"2026-07-23T20:53:08.233\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"block/blk-cgroup.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f05837ed73d0c73e950b2d9f2612febb0d3d451e\",\"lessThan\":\"4048ed98860d3785645ebbd34f69566a6c7320c3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f05837ed73d0c73e950b2d9f2612febb0d3d451e\",\"lessThan\":\"73a5af059905d171b398c8b2381632ee499948b5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f05837ed73d0c73e950b2d9f2612febb0d3d451e\",\"lessThan\":\"b3e005f16cd98f815429a87aef4c61e9c140779f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f05837ed73d0c73e950b2d9f2612febb0d3d451e\",\"lessThan\":\"000e8454692cab9d1f1b80130e2870e355301d06\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f05837ed73d0c73e950b2d9f2612febb0d3d451e\",\"lessThan\":\"23308af722fefed00af5f238024c11710938fba3\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"block/blk-cgroup.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-Other\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.3\",\"versionEndExcluding\":\"6.6.141\",\"matchCriteriaId\":\"681DADD7-FC7E-47E6-AC5C-0E445F6F3E42\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.91\",\"matchCriteriaId\":\"C918746B-DE6F-448F-A93E-A04C5481688D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.33\",\"matchCriteriaId\":\"96D99E49-380D-43AB-BDBA-25C3AD018A9C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.10\",\"matchCriteriaId\":\"A13475D2-59BF-4716-94B5-7C1D239A2CF4\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/000e8454692cab9d1f1b80130e2870e355301d06\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/23308af722fefed00af5f238024c11710938fba3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4048ed98860d3785645ebbd34f69566a6c7320c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/73a5af059905d171b398c8b2381632ee499948b5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b3e005f16cd98f815429a87aef4c61e9c140779f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-23T22:45:03+00:00",
      "cve": "CVE-2026-53126",
      "id": "CVE-2026-53126",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: blk-cgroup: fix disk reference leak in blkcg_maybe_throttle_current()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53126.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T02:02:36Z",
      "cve": "CVE-2026-53126",
      "id": "CVE-2026-53126",
      "initial_release_date": "2026-07-01T03:18:45Z",
      "product_status:first_fixed": "65",
      "product_status:known_affected": "92",
      "product_status:known_not_affected": "279",
      "product_status:recommended": "42",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53126",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53126.json",
      "version": "7"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.