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ext4: detect invalid INLINE_DATA + EXTENTS flag combination

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ext4: detect invalid INLINE_DATA + EXTENTS flag combination syzbot reported a BUG_ON in ext4_es_cache_extent() when opening a verity file on a corrupted ext4 filesystem mounted without a journal. The issue is that the filesystem has an inode with both the INLINE_DATA and EXTENTS flags set: EXT4-fs error (device loop0): ext4_cache_extents:545: inode #15: comm syz.0.17: corrupted extent tree: lblk 0 < prev 66 Investigation revealed that the inode has both flags set: DEBUG: inode 15 - flag=1, i_inline_off=164, has_inline=1, extents_flag=1 This is an invalid combination since an inode should have either: - INLINE_DATA: data stored directly in the inode - EXTENTS: data stored in extent-mapped blocks Having both flags causes ext4_has_inline_data() to return true, skipping extent tree validation in __ext4_iget(). The unvalidated out-of-order extents then trigger a BUG_ON in ext4_es_cache_extent() due to integer underflow when calculating hole sizes. Fix this by detecting this invalid flag combination early in ext4_iget() and rejecting the corrupted inode.

Announced Source revision 1
Original source ↗

CVE-2025-40167

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-40167

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "f19d5870cbf72d4cb2a8e1f749dff97af99b071e",
        "lessThan": "4954d297c91d292630ab43ba4d195dc371ce65d3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f19d5870cbf72d4cb2a8e1f749dff97af99b071e",
        "lessThan": "f061f7c331fc16250fc82aa68964f35821687217",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f19d5870cbf72d4cb2a8e1f749dff97af99b071e",
        "lessThan": "2e9e10657b04152ed0d6ecae8d0c02a3405e28f5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f19d5870cbf72d4cb2a8e1f749dff97af99b071e",
        "lessThan": "1437c95ab2a28b138d4521653583729f61ccb48b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f19d5870cbf72d4cb2a8e1f749dff97af99b071e",
        "lessThan": "cb6039b68efa547b676a8a10fc4618d9d1865c23",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f19d5870cbf72d4cb2a8e1f749dff97af99b071e",
        "lessThan": "de985264eef64be8a90595908f2e6a87946dad34",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f19d5870cbf72d4cb2a8e1f749dff97af99b071e",
        "lessThan": "1f5ccd22ff482639133f2a0fe08f6d19d0e68717",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f19d5870cbf72d4cb2a8e1f749dff97af99b071e",
        "lessThan": "1d3ad183943b38eec2acf72a0ae98e635dc8456b",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/ext4/inode.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.301",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.246",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.196",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.17.5",
        "versionType": "semver",
        "lessThanOrEqual": "6.17.*"
      },
      {
        "status": "unaffected",
        "version": "6.18",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ext4/inode.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-40167

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30682 · Revision 1
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Publisher date
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