Vulnerability-Lookup

EUVD-2026-346188

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:07

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

JSON

To clipboard

{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:07:28.233135+00:00",
  "id": "EUVD-2026-346188"
}

CVE-2024-47740 (GCVE-0-2024-47740)

Vulnerability from cvelistv5 – Published: 2024-10-21 12:14 – Updated: 2026-08-05 11:39

Title

f2fs: Require FMODE_WRITE for atomic write ioctls

Summary

In the Linux kernel, the following vulnerability has been resolved: f2fs: Require FMODE_WRITE for atomic write ioctls The F2FS ioctls for starting and committing atomic writes check for inode_owner_or_capable(), but this does not give LSMs like SELinux or Landlock an opportunity to deny the write access - if the caller's FSUID matches the inode's UID, inode_owner_or_capable() immediately returns true. There are scenarios where LSMs want to deny a process the ability to write particular files, even files that the FSUID of the process owns; but this can currently partially be bypassed using atomic write ioctls in two ways: - F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can truncate an inode to size 0 - F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert changes another process concurrently made to a file Fix it by requiring FMODE_WRITE for these operations, just like for F2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these ioctls when intending to write into the file, that seems unlikely to break anything.

Severity

7.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-10-21 12:59 UTC

Assigner

Linux mitre root Scorecard

References

11 references

URL	Tags
https://git.kernel.org/stable/c/700f3a7c7fa5764c9…
https://git.kernel.org/stable/c/4ce87674c3a6b4d3b…
https://git.kernel.org/stable/c/000bab8753ae29a25…
https://git.kernel.org/stable/c/88ff021e1fea2d9b4…
https://git.kernel.org/stable/c/32f348ecc149e9ca7…
https://git.kernel.org/stable/c/5e0de753bfe87768e…
https://git.kernel.org/stable/c/f3bfac2cabf533350…
https://git.kernel.org/stable/c/4583290898c13c2c2…
https://git.kernel.org/stable/c/4f5a100f87f32cb65…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 88b88a66797159949cec32eaab12b4968f6fae2d , < 700f3a7c7fa5764c9f24bbf7c78e0b6e479fa653 (git) Affected: 88b88a66797159949cec32eaab12b4968f6fae2d , < 4ce87674c3a6b4d3b3d45f85b584ab8618a3cece (git) Affected: 88b88a66797159949cec32eaab12b4968f6fae2d , < 000bab8753ae29a259feb339b99ee759795a48ac (git) Affected: 88b88a66797159949cec32eaab12b4968f6fae2d , < 88ff021e1fea2d9b40b2d5efd9013c89f7be04ac (git) Affected: 88b88a66797159949cec32eaab12b4968f6fae2d , < 32f348ecc149e9ca70a1c424ae8fa9b6919d2713 (git) Affected: 88b88a66797159949cec32eaab12b4968f6fae2d , < 5e0de753bfe87768ebe6744d869caa92f35e5731 (git) Affected: 88b88a66797159949cec32eaab12b4968f6fae2d , < f3bfac2cabf5333506b263bc0c8497c95302f32d (git) Affected: 88b88a66797159949cec32eaab12b4968f6fae2d , < 4583290898c13c2c2e5eb8773886d153c2c5121d (git) Affected: 88b88a66797159949cec32eaab12b4968f6fae2d , < 4f5a100f87f32cb65d4bb1ad282a08c92f6f591e (git)
Linux	Linux	Affected: 3.18 Unaffected: 0 , < 3.18 (semver) Unaffected: 4.19.323 , ≤ 4.19.* (semver) Unaffected: 5.4.285 , ≤ 5.4.* (semver) Unaffected: 5.10.227 , ≤ 5.10.* (semver) Unaffected: 5.15.168 , ≤ 5.15.* (semver) Unaffected: 6.1.113 , ≤ 6.1.* (semver) Unaffected: 6.6.54 , ≤ 6.6.* (semver) Unaffected: 6.10.13 , ≤ 6.10.* (semver) Unaffected: 6.11.2 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-47740",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-21T12:59:19.414286Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-21T13:04:14.597Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T22:21:36.961Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/file.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "700f3a7c7fa5764c9f24bbf7c78e0b6e479fa653",
              "status": "affected",
              "version": "88b88a66797159949cec32eaab12b4968f6fae2d",
              "versionType": "git"
            },
            {
              "lessThan": "4ce87674c3a6b4d3b3d45f85b584ab8618a3cece",
              "status": "affected",
              "version": "88b88a66797159949cec32eaab12b4968f6fae2d",
              "versionType": "git"
            },
            {
              "lessThan": "000bab8753ae29a259feb339b99ee759795a48ac",
              "status": "affected",
              "version": "88b88a66797159949cec32eaab12b4968f6fae2d",
              "versionType": "git"
            },
            {
              "lessThan": "88ff021e1fea2d9b40b2d5efd9013c89f7be04ac",
              "status": "affected",
              "version": "88b88a66797159949cec32eaab12b4968f6fae2d",
              "versionType": "git"
            },
            {
              "lessThan": "32f348ecc149e9ca70a1c424ae8fa9b6919d2713",
              "status": "affected",
              "version": "88b88a66797159949cec32eaab12b4968f6fae2d",
              "versionType": "git"
            },
            {
              "lessThan": "5e0de753bfe87768ebe6744d869caa92f35e5731",
              "status": "affected",
              "version": "88b88a66797159949cec32eaab12b4968f6fae2d",
              "versionType": "git"
            },
            {
              "lessThan": "f3bfac2cabf5333506b263bc0c8497c95302f32d",
              "status": "affected",
              "version": "88b88a66797159949cec32eaab12b4968f6fae2d",
              "versionType": "git"
            },
            {
              "lessThan": "4583290898c13c2c2e5eb8773886d153c2c5121d",
              "status": "affected",
              "version": "88b88a66797159949cec32eaab12b4968f6fae2d",
              "versionType": "git"
            },
            {
              "lessThan": "4f5a100f87f32cb65d4bb1ad282a08c92f6f591e",
              "status": "affected",
              "version": "88b88a66797159949cec32eaab12b4968f6fae2d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/file.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.18"
            },
            {
              "lessThan": "3.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.323",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.285",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.227",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.10.*",
              "status": "unaffected",
              "version": "6.10.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.12",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.323",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.285",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.227",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.168",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.113",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.54",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.10.13",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.11.2",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: Require FMODE_WRITE for atomic write ioctls\n\nThe F2FS ioctls for starting and committing atomic writes check for\ninode_owner_or_capable(), but this does not give LSMs like SELinux or\nLandlock an opportunity to deny the write access - if the caller\u0027s FSUID\nmatches the inode\u0027s UID, inode_owner_or_capable() immediately returns true.\n\nThere are scenarios where LSMs want to deny a process the ability to write\nparticular files, even files that the FSUID of the process owns; but this\ncan currently partially be bypassed using atomic write ioctls in two ways:\n\n - F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can\n   truncate an inode to size 0\n - F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert\n   changes another process concurrently made to a file\n\nFix it by requiring FMODE_WRITE for these operations, just like for\nF2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these\nioctls when intending to write into the file, that seems unlikely to break\nanything."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires issuing F2FS_IOC_START_ATOMIC_REPLACE/COMMIT/ABORT ioctls on a local file descriptor for a regular file on a locally-mounted f2fs filesystem. There is no network-reachable path to fs/f2fs/file.c ioctl handlers.\nAC:L - The destructive primitive is two deterministic ioctl calls on an fd the attacker already holds \u2014 no race, no memory-layout dependency, no timing sensitivity. Even the rollback variant is attacker-timed: it chooses when to START and when to ABORT, and any concurrent writes landing in that window are discarded, so a wider window simply catches more.\nPR:L - Only local unprivileged code execution plus an O_RDONLY fd on a file whose UID matches the attacker\u0027s FSUID is needed; inode_owner_or_capable() short-circuits on the UID match, so no capability, user namespace, or root is required. mnt_want_write_file() checks only that the mount is writable, not the fd.\nUI:N - START_ATOMIC_REPLACE + COMMIT_ATOMIC_WRITE truncates the file to zero entirely under attacker control, with no victim action required. The attacker opens the file itself and needs nothing from any other process.\nS:U - The vulnerable f2fs ioctl handler and the impacted files are both governed by the kernel\u0027s security authority; bypassing an in-kernel LSM check is not a crossing into a different authority. No hypervisor, IOMMU, or VM boundary is traversed.\nC:N - The bug is purely a missing write-side access-control check \u2014 the attacker already holds read access to the target file, so nothing new is disclosed. No kernel memory is leaked and no read primitive is created.\nI:H - The attacker gains write-equivalent power over files the security policy explicitly protected from modification: complete irreversible truncation to size 0, and silent rollback of another process\u0027s already-acknowledged writes. For a Landlock- or SELinux-confined process the protected file set is exactly what falls, and every byte of it can be destroyed \u2014 a total loss of integrity for the affected resources.\nA:H - Truncating a target such as a system database, keystore, or configuration file to zero permanently destroys the resource and renders the depending service unavailable. Independently, the attacker can pin the inode in atomic-write state for as long as it chooses, causing all O_DIRECT reads/writes from legitimate processes to fail -EOPNOTSUPP and fallocate/MOVE_RANGE/SET_PIN_FILE/defrag to fail -EINVAL \u2014 a sustained, attacker-controlled denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:39:50.713Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/700f3a7c7fa5764c9f24bbf7c78e0b6e479fa653"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ce87674c3a6b4d3b3d45f85b584ab8618a3cece"
        },
        {
          "url": "https://git.kernel.org/stable/c/000bab8753ae29a259feb339b99ee759795a48ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/88ff021e1fea2d9b40b2d5efd9013c89f7be04ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/32f348ecc149e9ca70a1c424ae8fa9b6919d2713"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e0de753bfe87768ebe6744d869caa92f35e5731"
        },
        {
          "url": "https://git.kernel.org/stable/c/f3bfac2cabf5333506b263bc0c8497c95302f32d"
        },
        {
          "url": "https://git.kernel.org/stable/c/4583290898c13c2c2e5eb8773886d153c2c5121d"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f5a100f87f32cb65d4bb1ad282a08c92f6f591e"
        }
      ],
      "title": "f2fs: Require FMODE_WRITE for atomic write ioctls",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-47740",
    "datePublished": "2024-10-21T12:14:09.171Z",
    "dateReserved": "2024-09-30T16:00:12.959Z",
    "dateUpdated": "2026-08-05T11:39:50.713Z",
    "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

EUVD-2026-346188

CVE-2024-47740 (GCVE-0-2024-47740)

Tags

Sightings

Nomenclature

Related by attack behaviour