Vulnerability-Lookup

FKIE_CVE-2026-46175

Vulnerability from fkie_nvd - Published: 2026-05-28 10:16 - Updated: 2026-06-17 10:53

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix fsck inconsistency caused by FGGC of node block During FGGC node block migration, fsck may incorrectly treat the migrated node block as fsync-written data. The reproduction scenario: root@vm:/mnt/f2fs# seq 1 2048 | xargs -n 1 ./test_sync // write inline inode and sync root@vm:/mnt/f2fs# rm -f 1 root@vm:/mnt/f2fs# sync root@vm:/mnt/f2fs# f2fs_io gc_range // move data block in sync mode and not write CP SPO, "fsck --dry-run" find inode has already checkpointed but still with DENT_BIT_SHIFT set The root cause is that GC does not clear the dentry mark and fsync mark during node block migration, leading fsck to misinterpret them as user-issued fsync writes. In BGGC mode, node block migration is handled by f2fs_sync_node_pages(), which guarantees the dentry and fsync marks are cleared before writing. This patch move the set/clear of the fsync|dentry marks into __write_node_folio to make the logic clearer, and ensures the fsync|dentry mark is cleared in FGGC.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8be551f538dc5b64183e27bd45a7a0795263f760	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c3e238bd1f56993f205ef83889d406dfeaf717a8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e7c6d30169b03307d27c4479563df79c08f3a746	Patch

Impacted products

	Vendor	Product	Version
	linux	linux_kernel	*
	linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/node.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8be551f538dc5b64183e27bd45a7a0795263f760",
              "status": "affected",
              "version": "da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f",
              "versionType": "git"
            },
            {
              "lessThan": "e7c6d30169b03307d27c4479563df79c08f3a746",
              "status": "affected",
              "version": "da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f",
              "versionType": "git"
            },
            {
              "lessThan": "c3e238bd1f56993f205ef83889d406dfeaf717a8",
              "status": "affected",
              "version": "da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/node.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.7"
            },
            {
              "lessThan": "4.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B1C461EB-D960-4EDF-ABA3-671CF601DAE7",
              "versionEndExcluding": "6.18.30",
              "versionStartIncluding": "4.7",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D0893CA7-9AE6-4DFE-AC75-48967D73AD8E",
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              "versionStartIncluding": "6.19",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix fsck inconsistency caused by FGGC of node block\n\nDuring FGGC node block migration, fsck may incorrectly treat the\nmigrated node block as fsync-written data.\n\nThe reproduction scenario:\nroot@vm:/mnt/f2fs# seq 1 2048 | xargs -n 1 ./test_sync // write inline inode and sync\nroot@vm:/mnt/f2fs# rm -f 1\nroot@vm:/mnt/f2fs# sync\nroot@vm:/mnt/f2fs# f2fs_io gc_range // move data block in sync mode and not write CP\n  SPO, \"fsck --dry-run\" find inode has already checkpointed but still\n  with DENT_BIT_SHIFT set\n\nThe root cause is that GC does not clear the dentry mark and fsync mark\nduring node block migration, leading fsck to misinterpret them as\nuser-issued fsync writes.\n\nIn BGGC mode, node block migration is handled by f2fs_sync_node_pages(),\nwhich guarantees the dentry and fsync marks are cleared before writing.\n\nThis patch move the set/clear of the fsync|dentry marks into\n__write_node_folio to make the logic clearer, and ensures the\nfsync|dentry mark is cleared in FGGC."
    }
  ],
  "id": "CVE-2026-46175",
  "lastModified": "2026-06-17T10:53:13.153",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-28T10:16:33.130",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/8be551f538dc5b64183e27bd45a7a0795263f760"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c3e238bd1f56993f205ef83889d406dfeaf717a8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/e7c6d30169b03307d27c4479563df79c08f3a746"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-46175 (GCVE-0-2026-46175)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-08-05 12:30

Title

f2fs: fix fsck inconsistency caused by FGGC of node block

Summary

Severity

7.1 (High)


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

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6665 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/8be551f538dc5b641…
https://git.kernel.org/stable/c/e7c6d30169b03307d…
https://git.kernel.org/stable/c/c3e238bd1f56993f2…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f , < 8be551f538dc5b64183e27bd45a7a0795263f760 (git) Affected: da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f , < e7c6d30169b03307d27c4479563df79c08f3a746 (git) Affected: da011cc0da8cf4a60ddf4d2ae8b42902a3d71e5f , < c3e238bd1f56993f205ef83889d406dfeaf717a8 (git)
Linux	Linux	Affected: 4.7 Unaffected: 0 , < 4.7 (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/node.c"
          ],
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          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
            }
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
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        }
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          "scenarios": [
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              "lang": "en",
              "value": "AV:L - f2fs is a local block-device filesystem (default on Android/embedded); the vulnerable FGGC path is reached only by a local actor writing to a mounted f2fs volume, not over any network.\nAC:L - The attacker fully sets up the trigger (write+fsync an inline inode, delete it, exhaust free space to force FGGC of its node block); the corrupt on-disk state then persists until the next checkpoint, and routine power cycles/reboots on the target devices reliably invoke the faulty recovery.\nPR:L - While the GC ioctls require CAP_SYS_ADMIN, automatic foreground GC (f2fs_balance_fs \u2192 f2fs_gc promoting to FG_GC on low free space) runs the exact vulnerable path for any unprivileged user with write access to the filesystem.\nUI:N - Roll-forward recovery runs automatically during the next mount after a crash; no victim action is needed beyond the normal, automatic crash-and-remount cycle.\nS:U - The corruption is confined to the f2fs on-disk structures and the kernel managing them; it does not cross into a different security authority.\nC:N - The bug corrupts filesystem-consistency metadata but provides no read primitive over kernel memory or otherwise-inaccessible data, so there is no information disclosure.\nI:H - The migrated node block is misinterpreted as fsynced data, causing incorrect roll-forward recovery that resurrects deleted/stale inode metadata and leaves the on-disk filesystem inconsistent (fsck-detected) \u2014 a serious integrity compromise of stored data.\nA:H - A bad recovery can return an error, aborting the mount and rendering the filesystem/data unavailable until offline fsck (e.g. /data mount failure), and with CONFIG_F2FS_CHECK_FS the recovery error path hits BUG_ON(), crashing the kernel."
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    "dateReserved": "2026-05-13T15:03:33.103Z",
    "dateUpdated": "2026-08-05T12:30:13.236Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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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