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EUVD-2026-347145

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": "2026-10-02T08:12:27.991207+00:00",
  "id": "EUVD-2026-347145"
}

CVE-2025-38677 (GCVE-0-2025-38677)

Vulnerability from cvelistv5 – Published: 2025-08-30 09:19 – Updated: 2026-08-05 12:03

Title

f2fs: fix to avoid out-of-boundary access in dnode page

Summary

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid out-of-boundary access in dnode page As Jiaming Zhang reported: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x17e/0x800 mm/kasan/report.c:480 kasan_report+0x147/0x180 mm/kasan/report.c:593 data_blkaddr fs/f2fs/f2fs.h:3053 [inline] f2fs_data_blkaddr fs/f2fs/f2fs.h:3058 [inline] f2fs_get_dnode_of_data+0x1a09/0x1c40 fs/f2fs/node.c:855 f2fs_reserve_block+0x53/0x310 fs/f2fs/data.c:1195 prepare_write_begin fs/f2fs/data.c:3395 [inline] f2fs_write_begin+0xf39/0x2190 fs/f2fs/data.c:3594 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112 f2fs_buffered_write_iter fs/f2fs/file.c:4988 [inline] f2fs_file_write_iter+0x1ec8/0x2410 fs/f2fs/file.c:5216 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x546/0xa90 fs/read_write.c:686 ksys_write+0x149/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x3d0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The root cause is in the corrupted image, there is a dnode has the same node id w/ its inode, so during f2fs_get_dnode_of_data(), it tries to access block address in dnode at offset 934, however it parses the dnode as inode node, so that get_dnode_addr() returns 360, then it tries to access page address from 360 + 934 * 4 = 4096 w/ 4 bytes. To fix this issue, let's add sanity check for node id of all direct nodes during f2fs_get_dnode_of_data().

Severity

7.8 (High)


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

Assigner

Linux mitre root Scorecard

References

11 references

URL	Tags
https://git.kernel.org/stable/c/ee4d13f5407cbdf12…
https://git.kernel.org/stable/c/a650654365c574074…
https://git.kernel.org/stable/c/6b7784ea07e6aa044…
https://git.kernel.org/stable/c/901f62efd6e855f93…
https://git.kernel.org/stable/c/92ef491b506a0f4dd…
https://git.kernel.org/stable/c/888aa660144bcb6ec…
https://git.kernel.org/stable/c/f1d5093d9fe9f3c74…
https://git.kernel.org/stable/c/77de19b6867f2740c…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

3 products

Vendor	Product	Version
Linux	Linux	Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < ee4d13f5407cbdf1216cc258f45492075713889a (git) Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < a650654365c57407413e9b1f6ff4d539bf2e99ca (git) Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 6b7784ea07e6aa044f74b39d6b5af5e28746fc81 (git) Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 901f62efd6e855f93d8b1175540f29f4dc45ba55 (git) Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 92ef491b506a0f4dd971a3a76f86f2d8f5370180 (git) Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 888aa660144bcb6ec07839da756ee46bfcf7fc53 (git) Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < f1d5093d9fe9f3c74c123741c88666cc853b79c5 (git) Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < 77de19b6867f2740cdcb6c9c7e50d522b47847a4 (git)
Linux	Linux	Affected: 3.8 Unaffected: 0 , < 3.8 (semver) Unaffected: 5.4.297 , ≤ 5.4.* (semver) Unaffected: 5.10.241 , ≤ 5.10.* (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.149 , ≤ 6.1.* (semver) Unaffected: 6.6.103 , ≤ 6.6.* (semver) Unaffected: 6.12.44 , ≤ 6.12.* (semver) Unaffected: 6.16.4 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC CN 4100	Affected: 0 , < V5.0 (custom)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:41:02.759Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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        "title": "CVE Program Container"
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            "defaultStatus": "unknown",
            "product": "SIMATIC CN 4100",
            "vendor": "Siemens",
            "versions": [
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                "version": "0",
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-12T12:05:19.121Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
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          "versions": [
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              "versionType": "git"
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              "versionType": "git"
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            },
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              "status": "unaffected",
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        }
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid out-of-boundary access in dnode page\n\nAs Jiaming Zhang reported:\n\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0x17e/0x800 mm/kasan/report.c:480\n kasan_report+0x147/0x180 mm/kasan/report.c:593\n data_blkaddr fs/f2fs/f2fs.h:3053 [inline]\n f2fs_data_blkaddr fs/f2fs/f2fs.h:3058 [inline]\n f2fs_get_dnode_of_data+0x1a09/0x1c40 fs/f2fs/node.c:855\n f2fs_reserve_block+0x53/0x310 fs/f2fs/data.c:1195\n prepare_write_begin fs/f2fs/data.c:3395 [inline]\n f2fs_write_begin+0xf39/0x2190 fs/f2fs/data.c:3594\n generic_perform_write+0x2c7/0x910 mm/filemap.c:4112\n f2fs_buffered_write_iter fs/f2fs/file.c:4988 [inline]\n f2fs_file_write_iter+0x1ec8/0x2410 fs/f2fs/file.c:5216\n new_sync_write fs/read_write.c:593 [inline]\n vfs_write+0x546/0xa90 fs/read_write.c:686\n ksys_write+0x149/0x250 fs/read_write.c:738\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xf3/0x3d0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThe root cause is in the corrupted image, there is a dnode has the same\nnode id w/ its inode, so during f2fs_get_dnode_of_data(), it tries to\naccess block address in dnode at offset 934, however it parses the dnode\nas inode node, so that get_dnode_addr() returns 360, then it tries to\naccess page address from 360 + 934 * 4 = 4096 w/ 4 bytes.\n\nTo fix this issue, let\u0027s add sanity check for node id of all direct nodes\nduring f2fs_get_dnode_of_data()."
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              "value": "AV:L - The vulnerable path is reached through a local `write(2)`/`vfs_write` syscall on a file of a mounted f2fs filesystem, with no network component. Local access to the mount is required, so Attack Vector is Local.\nAC:L - Given a crafted f2fs image (a direct-node nid equal to the inode\u0027s own nid), the out-of-bounds access is fully deterministic \u2014 the attacker selects the OOB offset simply by choosing the file offset to write, and there is no race or unpredictable memory-layout precondition.\nPR:L - No capability or privilege check exists between the write syscall and `f2fs_get_dnode_of_data()`; any unprivileged user with access to the mounted (attacker-supplied or corrupted) f2fs volume can trigger it, matching the Android/removable-media deployment model where f2fs volumes are user-accessible.\nUI:N - Once the crafted image is present/mounted \u2014 commonly automatic via udisks2/vold-style auto-mount of removable media \u2014 the attacker triggers the bug entirely on their own with ordinary file writes, requiring no action from another user.\nS:U - The out-of-bounds access corrupts kernel memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `data_blkaddr()` performs an out-of-bounds read of up to ~336 bytes past the node page at 84 attacker-chosen 4-byte offsets, and the leaked values are surfaced to userspace as block addresses via FIBMAP/FIEMAP (`f2fs_bmap`); the accompanying heap corruption further enables information disclosure.\nI:H - `__set_data_blkaddr()` writes 4 bytes (`NEW_ADDR`, and later real block addresses) at the same out-of-bounds offset, giving an out-of-bounds write into memory adjacent to a page-cache page at attacker-selected offsets \u2014 a heap-corruption primitive suitable for control-flow hijacking.\nA:H - The bug reproduces as a KASAN-reported out-of-bounds access; corrupting adjacent kernel page/slab memory readily causes an oops or panic, and the condition is repeatedly triggerable."
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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.

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.

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EUVD-2026-347145

CVE-2025-38677 (GCVE-0-2025-38677)

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Nomenclature

Related by attack behaviour