Vulnerability-Lookup

GHSA-MQ6G-3VJ7-6G88

Vulnerability from github – Published: 2025-01-06 18:31 – Updated: 2025-01-08 00:30

Details

In the Linux kernel, the following vulnerability has been resolved:

ublk: detach gendisk from ublk device if add_disk() fails

Inside ublk_abort_requests(), gendisk is grabbed for aborting all inflight requests. And ublk_abort_requests() is called when exiting the uring context or handling timeout.

If add_disk() fails, the gendisk may have been freed when calling ublk_abort_requests(), so use-after-free can be caused when getting disk's reference in ublk_abort_requests().

Fixes the bug by detaching gendisk from ublk device if add_disk() fails.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2024-56764"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-01-06T17:15:42Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: detach gendisk from ublk device if add_disk() fails\n\nInside ublk_abort_requests(), gendisk is grabbed for aborting all\ninflight requests. And ublk_abort_requests() is called when exiting\nthe uring context or handling timeout.\n\nIf add_disk() fails, the gendisk may have been freed when calling\nublk_abort_requests(), so use-after-free can be caused when getting\ndisk\u0027s reference in ublk_abort_requests().\n\nFixes the bug by detaching gendisk from ublk device if add_disk() fails.",
  "id": "GHSA-mq6g-3vj7-6g88",
  "modified": "2025-01-08T00:30:49Z",
  "published": "2025-01-06T18:31:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56764"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/75cd4005da5492129917a4a4ee45e81660556104"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d680f2f76a3417fdfc3946da7471e81464f7b41"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-56764 (GCVE-0-2024-56764)

Vulnerability from cvelistv5 – Published: 2025-01-06 16:20 – Updated: 2026-08-05 11:46

Title

ublk: detach gendisk from ublk device if add_disk() fails

Summary

In the Linux kernel, the following vulnerability has been resolved: ublk: detach gendisk from ublk device if add_disk() fails Inside ublk_abort_requests(), gendisk is grabbed for aborting all inflight requests. And ublk_abort_requests() is called when exiting the uring context or handling timeout. If add_disk() fails, the gendisk may have been freed when calling ublk_abort_requests(), so use-after-free can be caused when getting disk's reference in ublk_abort_requests(). Fixes the bug by detaching gendisk from ublk device if add_disk() fails.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-11 15:41 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7063 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/7d680f2f76a3417fd…
https://git.kernel.org/stable/c/75cd4005da5492129…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: bd23f6c2c2d00518e2f27f2d25cef795de9bee56 , < 7d680f2f76a3417fdfc3946da7471e81464f7b41 (git) Affected: bd23f6c2c2d00518e2f27f2d25cef795de9bee56 , < 75cd4005da5492129917a4a4ee45e81660556104 (git)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (semver) Unaffected: 6.12.8 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-56764",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-11T15:41:19.788451Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-02-11T15:45:20.712Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/ublk_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7d680f2f76a3417fdfc3946da7471e81464f7b41",
              "status": "affected",
              "version": "bd23f6c2c2d00518e2f27f2d25cef795de9bee56",
              "versionType": "git"
            },
            {
              "lessThan": "75cd4005da5492129917a4a4ee45e81660556104",
              "status": "affected",
              "version": "bd23f6c2c2d00518e2f27f2d25cef795de9bee56",
              "versionType": "git"
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/ublk_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.8",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: detach gendisk from ublk device if add_disk() fails\n\nInside ublk_abort_requests(), gendisk is grabbed for aborting all\ninflight requests. And ublk_abort_requests() is called when exiting\nthe uring context or handling timeout.\n\nIf add_disk() fails, the gendisk may have been freed when calling\nublk_abort_requests(), so use-after-free can be caused when getting\ndisk\u0027s reference in ublk_abort_requests().\n\nFixes the bug by detaching gendisk from ublk device if add_disk() fails."
        }
      ],
      "metrics": [
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          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is reached through an io_uring passthrough control command on the local /dev/ublk-control device; no network vector exists.\nAC:L - After add_disk() fails, ub-\u003eub_disk is a persistent dangling pointer (not a narrow race window), and the attacker deterministically triggers the abort path by exiting the io_uring daemon they control.\nPR:L - ublk explicitly supports UBLK_F_UNPRIVILEGED_DEV, allowing a non-CAP_SYS_ADMIN user to create and start a user-owned ublk device, so an unprivileged local user can reach ublk_ctrl_start_dev().\nUI:N - The attacker performs all steps (create device, run daemon, start dev, exit daemon) with no victim interaction required.\nS:U - The use-after-free is confined to the kernel\u0027s own memory and privilege domain with no crossing of a security boundary.\nC:H - The UAF on the freed gendisk can be reallocated and sprayed by the attacker, enabling disclosure of controlled/adjacent kernel memory contents.\nI:H - The UAF writes into freed memory (get_device refcount) and dereferences disk-\u003equeue, giving heap-spray-based write/control-flow primitives.\nA:H - Dereferencing and modifying the freed gendisk reliably causes kernel memory corruption and oops/panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:46:24.574Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/75cd4005da5492129917a4a4ee45e81660556104"
        }
      ],
      "title": "ublk: detach gendisk from ublk device if add_disk() fails",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56764",
    "datePublished": "2025-01-06T16:20:43.256Z",
    "dateReserved": "2024-12-29T11:26:39.762Z",
    "dateUpdated": "2026-08-05T11:46:24.574Z",
    "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.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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