Vulnerability-Lookup

GHSA-GHRP-FHCH-VVR7

Vulnerability from github – Published: 2025-03-17 21:30 – Updated: 2025-03-17 21:30

Details

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

loop: implement ->free_disk

Ensure that the lo_device which is stored in the gendisk private data is valid until the gendisk is freed. Currently the loop driver uses a lot of effort to make sure a device is not freed when it is still in use, but to to fix a potential deadlock this will be relaxed a bit soon.

Severity

5.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2022-49531"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:29Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nloop: implement -\u003efree_disk\n\nEnsure that the lo_device which is stored in the gendisk private\ndata is valid until the gendisk is freed.  Currently the loop driver\nuses a lot of effort to make sure a device is not freed when it is\nstill in use, but to to fix a potential deadlock this will be relaxed\na bit soon.",
  "id": "GHSA-ghrp-fhch-vvr7",
  "modified": "2025-03-17T21:30:33Z",
  "published": "2025-03-17T21:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49531"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aadd1443aae7fe8956e3b11157827067f034406a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2c7f56f8b5256d57f9e3fc7794c31361d43bdd9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49531 (GCVE-0-2022-49531)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:13 – Updated: 2026-08-05 08:55

Title

loop: implement ->free_disk

Summary

In the Linux kernel, the following vulnerability has been resolved: loop: implement ->free_disk Ensure that the lo_device which is stored in the gendisk private data is valid until the gendisk is freed. Currently the loop driver uses a lot of effort to make sure a device is not freed when it is still in use, but to to fix a potential deadlock this will be relaxed a bit soon.

Severity

7.8 (High)


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

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-01 19:37 UTC

CWE

CWE-667 - Improper Locking

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6633 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/aadd1443aae7fe895…
https://git.kernel.org/stable/c/d2c7f56f8b5256d57…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 73285082745045bcd64333c1fbaa88f8490f2626 , < aadd1443aae7fe8956e3b11157827067f034406a (git) Affected: 73285082745045bcd64333c1fbaa88f8490f2626 , < d2c7f56f8b5256d57f9e3fc7794c31361d43bdd9 (git)
Linux	Linux	Affected: 2.6.22 Unaffected: 0 , < 2.6.22 (semver) Unaffected: 5.18.3 , ≤ 5.18.* (semver) Unaffected: 5.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2022-49531",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:37:55.551083Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-667",
                "description": "CWE-667 Improper Locking",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T19:46:41.143Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/loop.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "aadd1443aae7fe8956e3b11157827067f034406a",
              "status": "affected",
              "version": "73285082745045bcd64333c1fbaa88f8490f2626",
              "versionType": "git"
            },
            {
              "lessThan": "d2c7f56f8b5256d57f9e3fc7794c31361d43bdd9",
              "status": "affected",
              "version": "73285082745045bcd64333c1fbaa88f8490f2626",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/loop.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.22"
            },
            {
              "lessThan": "2.6.22",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18.3",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nloop: implement -\u003efree_disk\n\nEnsure that the lo_device which is stored in the gendisk private\ndata is valid until the gendisk is freed.  Currently the loop driver\nuses a lot of effort to make sure a device is not freed when it is\nstill in use, but to to fix a potential deadlock this will be relaxed\na bit soon."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only through local loop device lifecycle control\u2014LOOP_CTL_REMOVE on /dev/loop-control racing with opens of /dev/loopN\u2014not via network packet processing or adjacent-link protocols.\nAC:L - The attacker drives both sides of the open-vs-remove race (concurrent open of /dev/loopN while issuing LOOP_CTL_REMOVE after Lo_deleting is set but before/during del_gendisk and kfree(lo)), so success does not depend on conditions outside attacker control.\nPR:L - loop_control_ioctl has no capable() check; /dev/loop-control is mode 660 root:disk, so disk-group users and containers granted loop device access can add/remove devices without init-namespace CAP_SYS_ADMIN (same PR:L treatment as CVE-2023-53111).\nUI:N - The attacker performs LOOP_CTL_REMOVE and the concurrent open/teardown themselves; no separate victim action such as mounting a filesystem is required.\nS:U - Impact is a standard in-kernel use-after-free of loop_device within the host kernel\u2019s security authority, with no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - kfree(lo) while gendisk-\u003eprivate_data still refers to the freed loop_device is a slab UAF; reclaiming that object enables arbitrary kernel read/disclosure primitives.\nI:H - The same loop_device UAF can be heap-sprayed into write and control-flow hijack primitives (e.g., via lo_open/lo_release/ioctl paths touching the dangling private_data), enabling integrity compromise and privilege escalation.\nA:H - Dereferencing the freed loop_device (mutex_lock on destroyed lo_mutex, I/O via queuedata, etc.) reliably causes kernel oops/panic even when not fully exploited."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:55:27.919Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/aadd1443aae7fe8956e3b11157827067f034406a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2c7f56f8b5256d57f9e3fc7794c31361d43bdd9"
        }
      ],
      "title": "loop: implement -\u003efree_disk",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49531",
    "datePublished": "2025-02-26T02:13:51.542Z",
    "dateReserved": "2025-02-26T02:08:31.588Z",
    "dateUpdated": "2026-08-05T08:55:27.919Z",
    "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.

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.

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.

Action not permitted

GHSA-GHRP-FHCH-VVR7

CVE-2022-49531 (GCVE-0-2022-49531)

Tags

Sightings

Nomenclature

Related by attack behaviour