Vulnerability-Lookup

GHSA-GRVR-G5PP-PC9X

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-15 06:32

Details

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

ext4: fix kernel BUG in ext4_write_inline_data_end

When the data=journal mount option is used, the ext4_journalled_write_end() function incorrectly calls ext4_write_inline_data_end() without checking if the EXT4_STATE_MAY_INLINE_DATA flag is still set on the inode.

If a previous attempt to convert the inline data to an extent failed (e.g. due to ENOSPC), the EXT4_STATE_MAY_INLINE_DATA flag is cleared, but the EXT4_INODE_INLINE_DATA flag remains set. In this scenario, the next call to ext4_write_begin() will not prepare the inline data xattr for writing, but ext4_journalled_write_end() will incorrectly attempt to write to it, triggering a BUG_ON(pos + len > EXT4_I(inode)->i_inline_size) in ext4_write_inline_data() since i_inline_size was not expanded.

Fix this by ensuring that ext4_journalled_write_end() only calls ext4_write_inline_data_end() if the EXT4_STATE_MAY_INLINE_DATA flag is set, mirroring the behavior of ext4_write_end() and ext4_da_write_end().

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74308"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix kernel BUG in ext4_write_inline_data_end\n\nWhen the data=journal mount option is used, the ext4_journalled_write_end()\nfunction incorrectly calls ext4_write_inline_data_end() without checking\nif the EXT4_STATE_MAY_INLINE_DATA flag is still set on the inode.\n\nIf a previous attempt to convert the inline data to an extent failed (e.g.\ndue to ENOSPC), the EXT4_STATE_MAY_INLINE_DATA flag is cleared, but\nthe EXT4_INODE_INLINE_DATA flag remains set. In this scenario, the next\ncall to ext4_write_begin() will not prepare the inline data xattr for\nwriting, but ext4_journalled_write_end() will incorrectly attempt to write\nto it, triggering a BUG_ON(pos + len \u003e EXT4_I(inode)-\u003ei_inline_size) in\next4_write_inline_data() since i_inline_size was not expanded.\n\nFix this by ensuring that ext4_journalled_write_end() only calls\next4_write_inline_data_end() if the EXT4_STATE_MAY_INLINE_DATA flag is\nset, mirroring the behavior of ext4_write_end() and ext4_da_write_end().",
  "id": "GHSA-grvr-g5pp-pc9x",
  "modified": "2026-08-15T06:32:29Z",
  "published": "2026-08-15T06:32:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74308"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ae42b51607240990614e0843f0d3529aaff62cc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/260830a9a706f5d335398236fc788ce32f220de1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9808ae9fae996afa942bd963a39c9b1cdeebd0bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad09aa45965d3fafaf9963bc78109b73c0f9ac8d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f00f5c0dd55319bc33b76f72c853bda0e0a32eda"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-74308 (GCVE-0-2026-74308)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:16

Title

ext4: fix kernel BUG in ext4_write_inline_data_end

Summary

In the Linux kernel, the following vulnerability has been resolved: ext4: fix kernel BUG in ext4_write_inline_data_end When the data=journal mount option is used, the ext4_journalled_write_end() function incorrectly calls ext4_write_inline_data_end() without checking if the EXT4_STATE_MAY_INLINE_DATA flag is still set on the inode. If a previous attempt to convert the inline data to an extent failed (e.g. due to ENOSPC), the EXT4_STATE_MAY_INLINE_DATA flag is cleared, but the EXT4_INODE_INLINE_DATA flag remains set. In this scenario, the next call to ext4_write_begin() will not prepare the inline data xattr for writing, but ext4_journalled_write_end() will incorrectly attempt to write to it, triggering a BUG_ON(pos + len > EXT4_I(inode)->i_inline_size) in ext4_write_inline_data() since i_inline_size was not expanded. Fix this by ensuring that ext4_journalled_write_end() only calls ext4_write_inline_data_end() if the EXT4_STATE_MAY_INLINE_DATA flag is set, mirroring the behavior of ext4_write_end() and ext4_da_write_end().

Severity

No CVSS data available.

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/260830a9a706f5d33…
https://git.kernel.org/stable/c/9808ae9fae996afa9…
https://git.kernel.org/stable/c/f00f5c0dd55319bc3…
https://git.kernel.org/stable/c/0ae42b51607240990…
https://git.kernel.org/stable/c/ad09aa45965d3fafa…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb , < 260830a9a706f5d335398236fc788ce32f220de1 (git) Affected: 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb , < 9808ae9fae996afa942bd963a39c9b1cdeebd0bd (git) Affected: 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb , < f00f5c0dd55319bc33b76f72c853bda0e0a32eda (git) Affected: 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb , < 0ae42b51607240990614e0843f0d3529aaff62cc (git) Affected: 3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb , < ad09aa45965d3fafaf9963bc78109b73c0f9ac8d (git)
Linux	Linux	Affected: 3.8 Unaffected: 0 , < 3.8 (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
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          "defaultStatus": "unaffected",
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          "programFiles": [
            "fs/ext4/inode.c"
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              "versionType": "git"
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          ]
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                {
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:16:57.145Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/0ae42b51607240990614e0843f0d3529aaff62cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad09aa45965d3fafaf9963bc78109b73c0f9ac8d"
        }
      ],
      "title": "ext4: fix kernel BUG in ext4_write_inline_data_end",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74308",
    "datePublished": "2026-08-15T05:58:08.682Z",
    "dateReserved": "2026-08-15T05:44:03.883Z",
    "dateUpdated": "2026-08-17T05:16:57.145Z",
    "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.

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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GHSA-GRVR-G5PP-PC9X

CVE-2026-74308 (GCVE-0-2026-74308)

Tags

Sightings

Nomenclature