github - ghsa-6x6v-877j-v9fv

ghsa-6x6v-877j-v9fv

Vulnerability from github

Published

2025-08-19 18:31

Modified

2025-08-28 15:30

Details

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

f2fs: fix KMSAN uninit-value in extent_info usage

KMSAN reported a use of uninitialized value in __is_extent_mergeable() and __is_back_mergeable() via the read extent tree path.

The root cause is that get_read_extent_info() only initializes three fields (fofs, blk, len) of struct extent_info, leaving the remaining fields uninitialized. This leads to undefined behavior when those fields are accessed later, especially during extent merging.

Fix it by zero-initializing the extent_info struct before population.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38579"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-19T17:15:35Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix KMSAN uninit-value in extent_info usage\n\nKMSAN reported a use of uninitialized value in `__is_extent_mergeable()`\n and `__is_back_mergeable()` via the read extent tree path.\n\nThe root cause is that `get_read_extent_info()` only initializes three\nfields (`fofs`, `blk`, `len`) of `struct extent_info`, leaving the\nremaining fields uninitialized. This leads to undefined behavior\nwhen those fields are accessed later, especially during\nextent merging.\n\nFix it by zero-initializing the `extent_info` struct before population.",
  "id": "GHSA-6x6v-877j-v9fv",
  "modified": "2025-08-28T15:30:38Z",
  "published": "2025-08-19T18:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38579"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/01b6f5955e0008af6bc3a181310d2744bb349800"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/08e8ab00a6d20d5544c932ee85a297d833895141"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44a79437309e0ee2276ac17aaedc71253af253a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc1615d5aba4f396cf412579928539a2b124c8a0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e68b751ec2b15d866967812c57cfdfc1eba6a269"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-38579 (GCVE-0-2025-38579)

Vulnerability from cvelistv5

Published

2025-08-19 17:03

Modified

2025-08-28 14:43

Severity ?

Summary

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix KMSAN uninit-value in extent_info usage KMSAN reported a use of uninitialized value in `__is_extent_mergeable()` and `__is_back_mergeable()` via the read extent tree path. The root cause is that `get_read_extent_info()` only initializes three fields (`fofs`, `blk`, `len`) of `struct extent_info`, leaving the remaining fields uninitialized. This leads to undefined behavior when those fields are accessed later, especially during extent merging. Fix it by zero-initializing the `extent_info` struct before population.

References

▼	URL	Tags
	https://git.kernel.org/stable/c/08e8ab00a6d20d5544c932ee85a297d833895141
	https://git.kernel.org/stable/c/e68b751ec2b15d866967812c57cfdfc1eba6a269
	https://git.kernel.org/stable/c/dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898
	https://git.kernel.org/stable/c/44a79437309e0ee2276ac17aaedc71253af253a8
	https://git.kernel.org/stable/c/cc1615d5aba4f396cf412579928539a2b124c8a0
	https://git.kernel.org/stable/c/01b6f5955e0008af6bc3a181310d2744bb349800
	https://git.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0fa

Impacted products

Vendor

Product

Version

▼

Linux

Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768
Version: 94afd6d6e5253179c9b891d02081cc8355a11768

Linux

Version: 5.15

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/extent_cache.c"
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          "vendor": "Linux",
          "versions": [
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          ]
        },
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          "defaultStatus": "affected",
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "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-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                },
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-28T14:43:58.673Z",
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        {
          "url": "https://git.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0fa"
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  "cveMetadata": {
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    "cveId": "CVE-2025-38579",
    "datePublished": "2025-08-19T17:03:02.308Z",
    "dateReserved": "2025-04-16T04:51:24.026Z",
    "dateUpdated": "2025-08-28T14:43:58.673Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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