Vulnerability-Lookup

GHSA-CR67-QF5C-CF5W

Vulnerability from github – Published: 2025-08-22 18:31 – Updated: 2026-06-01 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode

w/ "mode=lfs" mount option, generic/299 will cause system panic as below:

------------[ cut here ]------------ kernel BUG at fs/f2fs/segment.c:2835! Call Trace: f2fs_allocate_data_block+0x6f4/0xc50 f2fs_map_blocks+0x970/0x1550 f2fs_iomap_begin+0xb2/0x1e0 iomap_iter+0x1d6/0x430 __iomap_dio_rw+0x208/0x9a0 f2fs_file_write_iter+0x6b3/0xfa0 aio_write+0x15d/0x2e0 io_submit_one+0x55e/0xab0 __x64_sys_io_submit+0xa5/0x230 do_syscall_64+0x84/0x2f0 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0010:new_curseg+0x70f/0x720

The root cause of we run out-of-space is: in f2fs_map_blocks(), f2fs may trigger foreground gc only if it allocates any physical block, it will be a little bit later when there is multiple threads writing data w/ aio/dio/bufio method in parallel, since we always use OPU in lfs mode, so f2fs_map_blocks() does block allocations aggressively.

In order to fix this issue, let's give a chance to trigger foreground gc in prior to block allocation in f2fs_map_blocks().

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38626"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-22T16:15:36Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode\n\nw/ \"mode=lfs\" mount option, generic/299 will cause system panic as below:\n\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/segment.c:2835!\nCall Trace:\n \u003cTASK\u003e\n f2fs_allocate_data_block+0x6f4/0xc50\n f2fs_map_blocks+0x970/0x1550\n f2fs_iomap_begin+0xb2/0x1e0\n iomap_iter+0x1d6/0x430\n __iomap_dio_rw+0x208/0x9a0\n f2fs_file_write_iter+0x6b3/0xfa0\n aio_write+0x15d/0x2e0\n io_submit_one+0x55e/0xab0\n __x64_sys_io_submit+0xa5/0x230\n do_syscall_64+0x84/0x2f0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\nRIP: 0010:new_curseg+0x70f/0x720\n\nThe root cause of we run out-of-space is: in f2fs_map_blocks(), f2fs may\ntrigger foreground gc only if it allocates any physical block, it will be\na little bit later when there is multiple threads writing data w/\naio/dio/bufio method in parallel, since we always use OPU in lfs mode, so\nf2fs_map_blocks() does block allocations aggressively.\n\nIn order to fix this issue, let\u0027s give a chance to trigger foreground\ngc in prior to block allocation in f2fs_map_blocks().",
  "id": "GHSA-cr67-qf5c-cf5w",
  "modified": "2026-06-01T18:31:21Z",
  "published": "2025-08-22T18:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38626"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1005a3ca28e90c7a64fa43023f866b960a60f791"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/385e64a0744584397b4b52b27c96703516f39968"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82765ce5c7a56f9309ee45328e763610eaf11253"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c737047f4665232d1e26b3620bc62df334545451"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2f280f43a2a9d918fd23169ff3a6f3b65c7cec5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f289690f50a01c3e085d87853392d5b7436a4cee"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-38626 (GCVE-0-2025-38626)

Vulnerability from cvelistv5 – Published: 2025-08-22 16:00 – Updated: 2026-06-01 16:05

Title

f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode

Summary

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode w/ "mode=lfs" mount option, generic/299 will cause system panic as below: ------------[ cut here ]------------ kernel BUG at fs/f2fs/segment.c:2835! Call Trace: <TASK> f2fs_allocate_data_block+0x6f4/0xc50 f2fs_map_blocks+0x970/0x1550 f2fs_iomap_begin+0xb2/0x1e0 iomap_iter+0x1d6/0x430 __iomap_dio_rw+0x208/0x9a0 f2fs_file_write_iter+0x6b3/0xfa0 aio_write+0x15d/0x2e0 io_submit_one+0x55e/0xab0 __x64_sys_io_submit+0xa5/0x230 do_syscall_64+0x84/0x2f0 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0010:new_curseg+0x70f/0x720 The root cause of we run out-of-space is: in f2fs_map_blocks(), f2fs may trigger foreground gc only if it allocates any physical block, it will be a little bit later when there is multiple threads writing data w/ aio/dio/bufio method in parallel, since we always use OPU in lfs mode, so f2fs_map_blocks() does block allocations aggressively. In order to fix this issue, let's give a chance to trigger foreground gc in prior to block allocation in f2fs_map_blocks().

Severity

No CVSS data available.

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/c737047f4665232d1…
https://git.kernel.org/stable/c/d2f280f43a2a9d918…
https://git.kernel.org/stable/c/f289690f50a01c3e0…
https://git.kernel.org/stable/c/82765ce5c7a56f930…
https://git.kernel.org/stable/c/264ede8a52f18647e…
https://git.kernel.org/stable/c/385e64a0744584397…
https://git.kernel.org/stable/c/1005a3ca28e90c7a6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 36abef4e796d382e81a0c2d21ea5327481dd7154 , < c737047f4665232d1e26b3620bc62df334545451 (git) Affected: 36abef4e796d382e81a0c2d21ea5327481dd7154 , < d2f280f43a2a9d918fd23169ff3a6f3b65c7cec5 (git) Affected: 36abef4e796d382e81a0c2d21ea5327481dd7154 , < f289690f50a01c3e085d87853392d5b7436a4cee (git) Affected: 36abef4e796d382e81a0c2d21ea5327481dd7154 , < 82765ce5c7a56f9309ee45328e763610eaf11253 (git) Affected: 36abef4e796d382e81a0c2d21ea5327481dd7154 , < 264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5 (git) Affected: 36abef4e796d382e81a0c2d21ea5327481dd7154 , < 385e64a0744584397b4b52b27c96703516f39968 (git) Affected: 36abef4e796d382e81a0c2d21ea5327481dd7154 , < 1005a3ca28e90c7a64fa43023f866b960a60f791 (git)
Linux	Linux	Affected: 4.8 Unaffected: 0 , < 4.8 (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 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)

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{
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        {
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          "programFiles": [
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          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
            },
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              "version": "36abef4e796d382e81a0c2d21ea5327481dd7154",
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          "versions": [
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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            {
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.42",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.16.1",
              "versionType": "semver"
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            }
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        }
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode\n\nw/ \"mode=lfs\" mount option, generic/299 will cause system panic as below:\n\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/segment.c:2835!\nCall Trace:\n \u003cTASK\u003e\n f2fs_allocate_data_block+0x6f4/0xc50\n f2fs_map_blocks+0x970/0x1550\n f2fs_iomap_begin+0xb2/0x1e0\n iomap_iter+0x1d6/0x430\n __iomap_dio_rw+0x208/0x9a0\n f2fs_file_write_iter+0x6b3/0xfa0\n aio_write+0x15d/0x2e0\n io_submit_one+0x55e/0xab0\n __x64_sys_io_submit+0xa5/0x230\n do_syscall_64+0x84/0x2f0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\nRIP: 0010:new_curseg+0x70f/0x720\n\nThe root cause of we run out-of-space is: in f2fs_map_blocks(), f2fs may\ntrigger foreground gc only if it allocates any physical block, it will be\na little bit later when there is multiple threads writing data w/\naio/dio/bufio method in parallel, since we always use OPU in lfs mode, so\nf2fs_map_blocks() does block allocations aggressively.\n\nIn order to fix this issue, let\u0027s give a chance to trigger foreground\ngc in prior to block allocation in f2fs_map_blocks()."
        }
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      "providerMetadata": {
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          "url": "https://git.kernel.org/stable/c/1005a3ca28e90c7a64fa43023f866b960a60f791"
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      "title": "f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode",
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    "cveId": "CVE-2025-38626",
    "datePublished": "2025-08-22T16:00:34.867Z",
    "dateReserved": "2025-04-16T04:51:24.029Z",
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    "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.
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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.

Detection rules are retrieved from Rulezet.

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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