Vulnerability-Lookup

FKIE_CVE-2022-50300

Vulnerability from fkie_nvd - Published: 2025-09-15 15:15 - Updated: 2026-08-04 10:18

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix extent map use-after-free when handling missing device in read_one_chunk Store the error code before freeing the extent_map. Though it's reference counted structure, in that function it's the first and last allocation so this would lead to a potential use-after-free. The error can happen eg. when chunk is stored on a missing device and the degraded mount option is missing. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216721

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/169a4cf46882974d4db6d85eb623ec898e51bbc0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1742e1c90c3da344f3bb9b1f1309b3f47482756a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b8e7ed42bc3ca0d0e4191ee394d34962d3624c22	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fce3713197ebba239e1c7e02174ed216ea1ee014	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/volumes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b8e7ed42bc3ca0d0e4191ee394d34962d3624c22",
              "status": "affected",
              "version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116",
              "versionType": "git"
            },
            {
              "lessThan": "fce3713197ebba239e1c7e02174ed216ea1ee014",
              "status": "affected",
              "version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116",
              "versionType": "git"
            },
            {
              "lessThan": "169a4cf46882974d4db6d85eb623ec898e51bbc0",
              "status": "affected",
              "version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116",
              "versionType": "git"
            },
            {
              "lessThan": "1742e1c90c3da344f3bb9b1f1309b3f47482756a",
              "status": "affected",
              "version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/volumes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.87",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B5E4BB44-E0A4-4635-8AF7-4A3DF104A47D",
              "versionEndExcluding": "5.15.87",
              "versionStartIncluding": "4.15",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "08D38C5F-9644-4549-BBA6-F0860F024D14",
              "versionEndExcluding": "6.0.18",
              "versionStartIncluding": "5.16",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BC4189D9-5478-4E88-A78D-9C1DE29B217C",
              "versionEndExcluding": "6.1.4",
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              "vulnerable": true
            }
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          "negate": false,
          "operator": "OR"
        }
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    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix extent map use-after-free when handling missing device in read_one_chunk\n\nStore the error code before freeing the extent_map. Though it\u0027s\nreference counted structure, in that function it\u0027s the first and last\nallocation so this would lead to a potential use-after-free.\n\nThe error can happen eg. when chunk is stored on a missing device and\nthe degraded mount option is missing.\n\nBugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216721"
    }
  ],
  "id": "CVE-2022-50300",
  "lastModified": "2026-08-04T10:18:10.140",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-09-15T15:15:41.483",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/169a4cf46882974d4db6d85eb623ec898e51bbc0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/1742e1c90c3da344f3bb9b1f1309b3f47482756a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/b8e7ed42bc3ca0d0e4191ee394d34962d3624c22"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/fce3713197ebba239e1c7e02174ed216ea1ee014"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2022-50300 (GCVE-0-2022-50300)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:45 – Updated: 2026-08-05 08:58

Title

btrfs: fix extent map use-after-free when handling missing device in read_one_chunk

Summary

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/b8e7ed42bc3ca0d0e…
https://git.kernel.org/stable/c/fce3713197ebba239…
https://git.kernel.org/stable/c/169a4cf46882974d4…
https://git.kernel.org/stable/c/1742e1c90c3da344f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: adfb69af7d8cb6a3958f75aad1ef4bc96891d116 , < b8e7ed42bc3ca0d0e4191ee394d34962d3624c22 (git) Affected: adfb69af7d8cb6a3958f75aad1ef4bc96891d116 , < fce3713197ebba239e1c7e02174ed216ea1ee014 (git) Affected: adfb69af7d8cb6a3958f75aad1ef4bc96891d116 , < 169a4cf46882974d4db6d85eb623ec898e51bbc0 (git) Affected: adfb69af7d8cb6a3958f75aad1ef4bc96891d116 , < 1742e1c90c3da344f3bb9b1f1309b3f47482756a (git)
Linux	Linux	Affected: 4.15 Unaffected: 0 , < 4.15 (semver) Unaffected: 5.15.87 , ≤ 5.15.* (semver) Unaffected: 6.0.18 , ≤ 6.0.* (semver) Unaffected: 6.1.4 , ≤ 6.1.* (semver) Unaffected: 6.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/volumes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b8e7ed42bc3ca0d0e4191ee394d34962d3624c22",
              "status": "affected",
              "version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116",
              "versionType": "git"
            },
            {
              "lessThan": "fce3713197ebba239e1c7e02174ed216ea1ee014",
              "status": "affected",
              "version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116",
              "versionType": "git"
            },
            {
              "lessThan": "169a4cf46882974d4db6d85eb623ec898e51bbc0",
              "status": "affected",
              "version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116",
              "versionType": "git"
            },
            {
              "lessThan": "1742e1c90c3da344f3bb9b1f1309b3f47482756a",
              "status": "affected",
              "version": "adfb69af7d8cb6a3958f75aad1ef4bc96891d116",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/volumes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.87",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.0.18",
                  "versionStartIncluding": "4.15",
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                },
                {
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                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix extent map use-after-free when handling missing device in read_one_chunk\n\nStore the error code before freeing the extent_map. Though it\u0027s\nreference counted structure, in that function it\u0027s the first and last\nallocation so this would lead to a potential use-after-free.\n\nThe error can happen eg. when chunk is stored on a missing device and\nthe degraded mount option is missing.\n\nBugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216721"
        }
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      "metrics": [
        {
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            "baseSeverity": "HIGH",
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            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path runs only during btrfs mount (open_ctree \u2192 btrfs_read_sys_array/btrfs_read_chunk_tree \u2192 read_one_chunk), reached via a local mount of a crafted or incomplete multi-device image, not via network packet processing.\nAC:L - An attacker can reliably trigger the UAF by supplying a filesystem whose chunk stripe references a missing device and ensuring mount without the non-default degraded option; the freshly allocated extent_map always has refcount 1 so free_extent_map unconditionally frees map before the PTR_ERR read.\nPR:N - btrfs lacks FS_USERNS_MOUNT so the attacker need not hold privileges on the victim host; crafting and delivering a malicious image (USB, download, shared disk) is sufficient, matching other mount-time filesystem UAF scores.\nUI:R - Exploitation requires a user or administrator to mount the attacker-controlled btrfs image, which is the necessary interaction that enters open_ctree and reaches read_one_chunk.\nS:U - Impact is confined to kernel memory in the host\u0027s btrfs mount path; this is standard kernel memory corruption without crossing a VM, IOMMU, or other security authority boundary.\nC:H - This is a genuine use-after-free of the kmalloc\u0027d map_lookup and extent_map objects; per CVSS kernel guidance a UAF enables reclaim and disclosure of freed object contents for arbitrary kernel memory read.\nI:H - Use-after-free of heap objects during mount enables heap grooming and write/control-flow primitives once the freed map_lookup/extent_map slabs are reused, so integrity impact is High.\nA:H - The UAF on freed map_lookup memory can cause kernel oops/panic (including via inconsistent mount continuation if a reused object yields a misleading return code), so availability impact is High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:58:04.535Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/1742e1c90c3da344f3bb9b1f1309b3f47482756a"
        }
      ],
      "title": "btrfs: fix extent map use-after-free when handling missing device in read_one_chunk",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50300",
    "datePublished": "2025-09-15T14:45:55.896Z",
    "dateReserved": "2025-09-15T14:18:36.812Z",
    "dateUpdated": "2026-08-05T08:58:04.535Z",
    "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.

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.