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 mitre root

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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      {
        "metrics": [
          {
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              "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",
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              "content": {
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                "options": [
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                "role": "CISA Coordinator",
                "timestamp": "2025-02-11T15:41:19.788451Z",
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        "providerMetadata": {
          "dateUpdated": "2025-02-11T15:45:20.712Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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      }
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    "cna": {
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          "programFiles": [
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
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              "status": "unaffected",
              "version": "0",
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
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          ]
        }
      ],
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              "cpeMatch": [
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        }
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              "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."
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          "url": "https://git.kernel.org/stable/c/75cd4005da5492129917a4a4ee45e81660556104"
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      "title": "ublk: detach gendisk from ublk device if add_disk() fails",
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    "state": "PUBLISHED"
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}

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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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