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FKIE_CVE-2026-74308

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:19
Severity
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0ae42b51607240990614e0843f0d3529aaff62cc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/260830a9a706f5d335398236fc788ce32f220de1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9808ae9fae996afa942bd963a39c9b1cdeebd0bd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad09aa45965d3fafaf9963bc78109b73c0f9ac8d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f00f5c0dd55319bc33b76f72c853bda0e0a32eda
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "260830a9a706f5d335398236fc788ce32f220de1",
              "status": "affected",
              "version": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb",
              "versionType": "git"
            },
            {
              "lessThan": "9808ae9fae996afa942bd963a39c9b1cdeebd0bd",
              "status": "affected",
              "version": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb",
              "versionType": "git"
            },
            {
              "lessThan": "f00f5c0dd55319bc33b76f72c853bda0e0a32eda",
              "status": "affected",
              "version": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb",
              "versionType": "git"
            },
            {
              "lessThan": "0ae42b51607240990614e0843f0d3529aaff62cc",
              "status": "affected",
              "version": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb",
              "versionType": "git"
            },
            {
              "lessThan": "ad09aa45965d3fafaf9963bc78109b73c0f9ac8d",
              "status": "affected",
              "version": "3fdcfb668fd78ec92d9bc2daddf1d41e2a8a30bb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.8"
            },
            {
              "lessThan": "3.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-74308",
  "lastModified": "2026-08-17T06:19:24.997",
  "metrics": {},
  "published": "2026-08-15T06:22:30.653",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0ae42b51607240990614e0843f0d3529aaff62cc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/260830a9a706f5d335398236fc788ce32f220de1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9808ae9fae996afa942bd963a39c9b1cdeebd0bd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ad09aa45965d3fafaf9963bc78109b73c0f9ac8d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f00f5c0dd55319bc33b76f72c853bda0e0a32eda"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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