Vulnerability-Lookup

FKIE_CVE-2026-98244

Vulnerability from fkie_nvd - Published: 2026-10-06 09:18 - Updated: 2026-10-06 09:18

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: btrfs: clear free space tree creation state on rebuild failure btrfs_rebuild_free_space_tree() sets BTRFS_FS_CREATING_FREE_SPACE_TREE before rebuilding the free space tree. Several error paths return without clearing this flag. The transaction restart failure path can leave the flag set on a live filesystem, causing delayed reference processing to be skipped. Clear it on all free space tree rebuild failure paths. Keep BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED set, since a failed rebuild leaves the free space tree untrusted. Callers must fall back to extent-tree caching.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3565893cc72cdf6b795cf6a33e7ff9605322334d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a32bedab8ece9d1f90a1476a5b486a1804dc78ba
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b1df2997d0cd2be7bef7b4ab64ccfd1019dedc81

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/free-space-tree.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a32bedab8ece9d1f90a1476a5b486a1804dc78ba",
              "status": "affected",
              "version": "882af9f13e830c0a4ef696bb72cd5998a5067a93",
              "versionType": "git"
            },
            {
              "lessThan": "b1df2997d0cd2be7bef7b4ab64ccfd1019dedc81",
              "status": "affected",
              "version": "882af9f13e830c0a4ef696bb72cd5998a5067a93",
              "versionType": "git"
            },
            {
              "lessThan": "3565893cc72cdf6b795cf6a33e7ff9605322334d",
              "status": "affected",
              "version": "882af9f13e830c0a4ef696bb72cd5998a5067a93",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/free-space-tree.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: clear free space tree creation state on rebuild failure\n\nbtrfs_rebuild_free_space_tree() sets BTRFS_FS_CREATING_FREE_SPACE_TREE\nbefore rebuilding the free space tree.  Several error paths return\nwithout clearing this flag.\n\nThe transaction restart failure path can leave the flag set on a live\nfilesystem, causing delayed reference processing to be skipped. Clear it\non all free space tree rebuild failure paths. Keep\nBTRFS_FS_FREE_SPACE_TREE_UNTRUSTED set, since a failed rebuild leaves\nthe free space tree untrusted. Callers must fall back to extent-tree\ncaching."
    }
  ],
  "id": "CVE-2026-98244",
  "lastModified": "2026-10-06T09:18:12.510",
  "metrics": {},
  "published": "2026-10-06T09:18:12.510",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3565893cc72cdf6b795cf6a33e7ff9605322334d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a32bedab8ece9d1f90a1476a5b486a1804dc78ba"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b1df2997d0cd2be7bef7b4ab64ccfd1019dedc81"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-98244 (GCVE-0-2026-98244)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:45 – Updated: 2026-10-06 08:45

Title

btrfs: clear free space tree creation state on rebuild failure

Summary

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

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

References

3 references

URL	Tags
https://git.kernel.org/stable/c/a32bedab8ece9d1f9…
https://git.kernel.org/stable/c/b1df2997d0cd2be7b…
https://git.kernel.org/stable/c/3565893cc72cdf6b7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 882af9f13e830c0a4ef696bb72cd5998a5067a93 , < a32bedab8ece9d1f90a1476a5b486a1804dc78ba (git) Affected: 882af9f13e830c0a4ef696bb72cd5998a5067a93 , < b1df2997d0cd2be7bef7b4ab64ccfd1019dedc81 (git) Affected: 882af9f13e830c0a4ef696bb72cd5998a5067a93 , < 3565893cc72cdf6b795cf6a33e7ff9605322334d (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.54 , ≤ 6.18.* (semver) Unaffected: 7.2.8 , ≤ 7.2.* (semver) Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/free-space-tree.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a32bedab8ece9d1f90a1476a5b486a1804dc78ba",
              "status": "affected",
              "version": "882af9f13e830c0a4ef696bb72cd5998a5067a93",
              "versionType": "git"
            },
            {
              "lessThan": "b1df2997d0cd2be7bef7b4ab64ccfd1019dedc81",
              "status": "affected",
              "version": "882af9f13e830c0a4ef696bb72cd5998a5067a93",
              "versionType": "git"
            },
            {
              "lessThan": "3565893cc72cdf6b795cf6a33e7ff9605322334d",
              "status": "affected",
              "version": "882af9f13e830c0a4ef696bb72cd5998a5067a93",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/free-space-tree.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.54",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.8",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc4",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: clear free space tree creation state on rebuild failure\n\nbtrfs_rebuild_free_space_tree() sets BTRFS_FS_CREATING_FREE_SPACE_TREE\nbefore rebuilding the free space tree.  Several error paths return\nwithout clearing this flag.\n\nThe transaction restart failure path can leave the flag set on a live\nfilesystem, causing delayed reference processing to be skipped. Clear it\non all free space tree rebuild failure paths. Keep\nBTRFS_FS_FREE_SPACE_TREE_UNTRUSTED set, since a failed rebuild leaves\nthe free space tree untrusted. Callers must fall back to extent-tree\ncaching."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-06T08:45:14.120Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a32bedab8ece9d1f90a1476a5b486a1804dc78ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1df2997d0cd2be7bef7b4ab64ccfd1019dedc81"
        },
        {
          "url": "https://git.kernel.org/stable/c/3565893cc72cdf6b795cf6a33e7ff9605322334d"
        }
      ],
      "title": "btrfs: clear free space tree creation state on rebuild failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98244",
    "datePublished": "2026-10-06T08:45:14.120Z",
    "dateReserved": "2026-09-25T10:25:14.330Z",
    "dateUpdated": "2026-10-06T08:45:14.120Z",
    "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

FKIE_CVE-2026-98244

CVE-2026-98244 (GCVE-0-2026-98244)

Tags

Sightings

Nomenclature

Related by attack behaviour