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EUVD-2026-347134

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:12

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.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:12:25.391358+00:00",
  "id": "EUVD-2026-347134"
}

CVE-2025-38652 (GCVE-0-2025-38652)

Vulnerability from cvelistv5 – Published: 2025-08-22 16:00 – Updated: 2026-08-05 12:03

Title

f2fs: fix to avoid out-of-boundary access in devs.path

Summary

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid out-of-boundary access in devs.path - touch /mnt/f2fs/012345678901234567890123456789012345678901234567890123 - truncate -s $((1024*1024*1024)) \ /mnt/f2fs/012345678901234567890123456789012345678901234567890123 - touch /mnt/f2fs/file - truncate -s $((1024*1024*1024)) /mnt/f2fs/file - mkfs.f2fs /mnt/f2fs/012345678901234567890123456789012345678901234567890123 \ -c /mnt/f2fs/file - mount /mnt/f2fs/012345678901234567890123456789012345678901234567890123 \ /mnt/f2fs/loop [16937.192225] F2FS-fs (loop0): Mount Device [ 0]: /mnt/f2fs/012345678901234567890123456789012345678901234567890123\xff\x01, 511, 0 - 3ffff [16937.192268] F2FS-fs (loop0): Failed to find devices If device path length equals to MAX_PATH_LEN, sbi->devs.path[] may not end up w/ null character due to path array is fully filled, So accidently, fields locate after path[] may be treated as part of device path, result in parsing wrong device path. struct f2fs_dev_info { ... char path[MAX_PATH_LEN]; ... }; Let's add one byte space for sbi->devs.path[] to store null character of device path string.

Severity

7.3 (High)


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

Assigner

Linux mitre root Scorecard

References

11 references

URL	Tags
https://git.kernel.org/stable/c/dc0172c74bd9edaee…
https://git.kernel.org/stable/c/1cf1ff15f262e8baf…
https://git.kernel.org/stable/c/666b7cf6ac9aa074b…
https://git.kernel.org/stable/c/3466721f06edff834…
https://git.kernel.org/stable/c/345fc8d1838f3f8be…
https://git.kernel.org/stable/c/70849d33130a2cf1d…
https://git.kernel.org/stable/c/755427093e4294ac1…
https://git.kernel.org/stable/c/1b1efa5f0e878745e…
https://git.kernel.org/stable/c/5661998536af52848…
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: 3c62be17d4f562f43fe1d03b48194399caa35aa5 , < dc0172c74bd9edaee7bea2ebb35f3dbd37a8ae80 (git) Affected: 3c62be17d4f562f43fe1d03b48194399caa35aa5 , < 1cf1ff15f262e8baf12201b270b6a79f9d119b2d (git) Affected: 3c62be17d4f562f43fe1d03b48194399caa35aa5 , < 666b7cf6ac9aa074b8319a2b68cba7f2c30023f0 (git) Affected: 3c62be17d4f562f43fe1d03b48194399caa35aa5 , < 3466721f06edff834f99d9f49f23eabc6b2cb78e (git) Affected: 3c62be17d4f562f43fe1d03b48194399caa35aa5 , < 345fc8d1838f3f8be7c8ed08d86a13dedef67136 (git) Affected: 3c62be17d4f562f43fe1d03b48194399caa35aa5 , < 70849d33130a2cf1d6010069ed200669c8651fbd (git) Affected: 3c62be17d4f562f43fe1d03b48194399caa35aa5 , < 755427093e4294ac111c3f9e40d53f681a0fbdaa (git) Affected: 3c62be17d4f562f43fe1d03b48194399caa35aa5 , < 1b1efa5f0e878745e94a98022e8edc675a87d78e (git) Affected: 3c62be17d4f562f43fe1d03b48194399caa35aa5 , < 5661998536af52848cc4d52a377e90368196edea (git)
Linux	Linux	Affected: 4.10 Unaffected: 0 , < 4.10 (semver) Unaffected: 5.4.297 , ≤ 5.4.* (semver) Unaffected: 5.10.241 , ≤ 5.10.* (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.148 , ≤ 6.1.* (semver) Unaffected: 6.6.102 , ≤ 6.6.* (semver) Unaffected: 6.12.42 , ≤ 6.12.* (semver) Unaffected: 6.15.10 , ≤ 6.15.* (semver) Unaffected: 6.16.1 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:40:45.643Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/f2fs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3c62be17d4f562f43fe1d03b48194399caa35aa5",
              "versionType": "git"
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              "versionType": "git"
            },
            {
              "lessThan": "666b7cf6ac9aa074b8319a2b68cba7f2c30023f0",
              "status": "affected",
              "version": "3c62be17d4f562f43fe1d03b48194399caa35aa5",
              "versionType": "git"
            },
            {
              "lessThan": "3466721f06edff834f99d9f49f23eabc6b2cb78e",
              "status": "affected",
              "version": "3c62be17d4f562f43fe1d03b48194399caa35aa5",
              "versionType": "git"
            },
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              "version": "3c62be17d4f562f43fe1d03b48194399caa35aa5",
              "versionType": "git"
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              "versionType": "git"
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              "versionType": "git"
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              "lessThan": "1b1efa5f0e878745e94a98022e8edc675a87d78e",
              "status": "affected",
              "version": "3c62be17d4f562f43fe1d03b48194399caa35aa5",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "3c62be17d4f562f43fe1d03b48194399caa35aa5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/f2fs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.10"
            },
            {
              "lessThan": "4.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.297",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.241",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.190",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.102",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.297",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "5.10.241",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.190",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.148",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.102",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.10",
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                {
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                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid out-of-boundary access in devs.path\n\n- touch /mnt/f2fs/012345678901234567890123456789012345678901234567890123\n- truncate -s $((1024*1024*1024)) \\\n  /mnt/f2fs/012345678901234567890123456789012345678901234567890123\n- touch /mnt/f2fs/file\n- truncate -s $((1024*1024*1024)) /mnt/f2fs/file\n- mkfs.f2fs /mnt/f2fs/012345678901234567890123456789012345678901234567890123 \\\n  -c /mnt/f2fs/file\n- mount /mnt/f2fs/012345678901234567890123456789012345678901234567890123 \\\n  /mnt/f2fs/loop\n\n[16937.192225] F2FS-fs (loop0): Mount Device [ 0]: /mnt/f2fs/012345678901234567890123456789012345678901234567890123\\xff\\x01,      511,        0 -    3ffff\n[16937.192268] F2FS-fs (loop0): Failed to find devices\n\nIf device path length equals to MAX_PATH_LEN, sbi-\u003edevs.path[] may\nnot end up w/ null character due to path array is fully filled, So\naccidently, fields locate after path[] may be treated as part of\ndevice path, result in parsing wrong device path.\n\nstruct f2fs_dev_info {\n...\n\tchar path[MAX_PATH_LEN];\n...\n};\n\nLet\u0027s add one byte space for sbi-\u003edevs.path[] to store null\ncharacter of device path string."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The only trigger is `mount(2)` of a crafted f2fs image whose superblock `devs[].path` is a full 64 bytes with no terminator (`get_tree_bdev` \u2192 `f2fs_fill_super` \u2192 `f2fs_scan_devices`), and the resulting disclosure is read back locally via `/proc/fs/f2fs/\u003cdev\u003e/disk_map`. No network or peer-supplied data reaches this code; between Physical (removable media) and Local, the higher-severity Local applies.\nAC:L - The attacker fully controls the on-disk `f2fs_device.path[64]` bytes and the adjacent `total_segments` value, so filling the path completely deterministically leaves `sbi-\u003edevs[i].path` unterminated on every mount \u2014 exactly as the reporter demonstrated. There is no race, no memory-layout guessing, and the trailing struct fields (`start_blk`/`end_blk`) are deterministically derived from segment counts the attacker chooses.\nPR:N - The attacker needs no account or privileges on the victim system \u2014 only delivery of a malicious f2fs image on an SD card, USB stick, or disk image that a privileged auto-mount daemon (Android vold, udisks2) or administrator later processes, which is the most severe reasonable scenario for f2fs given its role as the standard Android/removable-media filesystem.\nUI:R - f2fs does not set `FS_USERNS_MOUNT`, so mounting requires `CAP_SYS_ADMIN` in the initial user namespace; the crafted image therefore reaches the vulnerable code only when a victim inserts the media or mounts the image, and that mount action constitutes user interaction.\nS:U - The over-read, the leaked slab contents, and any resulting fault all remain within the kernel\u0027s own security authority on the host performing the mount; no VM, container, or IOMMU boundary is crossed.\nC:H - The unterminated string is read until an arbitrary in-memory NUL, so the length is determined by heap contents rather than by any bound: the over-read spills into `total_segments`/`start_blk`/`end_blk`, into `nr_blkz` and the `blkz_seq` kernel heap pointer on zoned devices, and past the end of the `kzalloc`\u0027d `f2fs_dev_info` array at its last element. Those bytes are printed verbatim into dmesg and exported through the world-readable 0444 `/proc/fs/f2fs/\u003cdev\u003e/disk_map`, so adjacent slab data and a kernel heap pointer (defeating KASLR) are disclosed to unprivileged userspace and can be re-read at will.\nI:L - The mis-parsed string is handed to `bdev_file_open_by_path()`, so f2fs can attach to and write filesystem data onto a block device whose path exceeds the 64-byte on-disk field \u2014 a target the format otherwise cannot name \u2014 corrupting that device\u0027s contents. There is no out-of-bounds write or attacker-controlled store, so the modification is limited rather than arbitrary.\nA:H - The strlen/vsnprintf walk past the end of the slab object faults hard on hardened configurations (KFENCE guard page, `panic_on_warn` with a KASAN slab-out-of-bounds report) and can read into unmapped memory at a slab-page boundary, oopsing the mounting task. Even without a fault, the mis-parsed device path aborts the mount with \"Failed to find devices\", leaving the volume \u2014 typically the device\u0027s primary Android/SD-card storage \u2014 unusable."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:03:40.653Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dc0172c74bd9edaee7bea2ebb35f3dbd37a8ae80"
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        {
          "url": "https://git.kernel.org/stable/c/1cf1ff15f262e8baf12201b270b6a79f9d119b2d"
        },
        {
          "url": "https://git.kernel.org/stable/c/666b7cf6ac9aa074b8319a2b68cba7f2c30023f0"
        },
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        },
        {
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        {
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/5661998536af52848cc4d52a377e90368196edea"
        }
      ],
      "title": "f2fs: fix to avoid out-of-boundary access in devs.path",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38652",
    "datePublished": "2025-08-22T16:00:56.445Z",
    "dateReserved": "2025-04-16T04:51:24.030Z",
    "dateUpdated": "2026-08-05T12:03:40.653Z",
    "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.
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EUVD-2026-347134

CVE-2025-38652 (GCVE-0-2025-38652)

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