{"api_version":"1","generated_at":"2026-08-13T12:25:31+00:00","cve":"CVE-2025-40167","urls":{"html":"https://cve.report/CVE-2025-40167","api":"https://cve.report/api/cve/CVE-2025-40167.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-40167","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-40167"},"summary":{"title":"ext4: detect invalid INLINE_DATA + EXTENTS flag combination","description":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: detect invalid INLINE_DATA + EXTENTS flag combination\n\nsyzbot reported a BUG_ON in ext4_es_cache_extent() when opening a verity\nfile on a corrupted ext4 filesystem mounted without a journal.\n\nThe issue is that the filesystem has an inode with both the INLINE_DATA\nand EXTENTS flags set:\n\n    EXT4-fs error (device loop0): ext4_cache_extents:545: inode #15:\n    comm syz.0.17: corrupted extent tree: lblk 0 < prev 66\n\nInvestigation revealed that the inode has both flags set:\n    DEBUG: inode 15 - flag=1, i_inline_off=164, has_inline=1, extents_flag=1\n\nThis is an invalid combination since an inode should have either:\n- INLINE_DATA: data stored directly in the inode\n- EXTENTS: data stored in extent-mapped blocks\n\nHaving both flags causes ext4_has_inline_data() to return true, skipping\nextent tree validation in __ext4_iget(). The unvalidated out-of-order\nextents then trigger a BUG_ON in ext4_es_cache_extent() due to integer\nunderflow when calculating hole sizes.\n\nFix this by detecting this invalid flag combination early in ext4_iget()\nand rejecting the corrupted inode.","state":"PUBLISHED","assigner":"Linux","published_at":"2025-11-12 11:15:47","updated_at":"2026-07-30 06:24:14"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/1f5ccd22ff482639133f2a0fe08f6d19d0e68717","name":"https://git.kernel.org/stable/c/1f5ccd22ff482639133f2a0fe08f6d19d0e68717","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1d3ad183943b38eec2acf72a0ae98e635dc8456b","name":"https://git.kernel.org/stable/c/1d3ad183943b38eec2acf72a0ae98e635dc8456b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1437c95ab2a28b138d4521653583729f61ccb48b","name":"https://git.kernel.org/stable/c/1437c95ab2a28b138d4521653583729f61ccb48b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cb6039b68efa547b676a8a10fc4618d9d1865c23","name":"https://git.kernel.org/stable/c/cb6039b68efa547b676a8a10fc4618d9d1865c23","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f061f7c331fc16250fc82aa68964f35821687217","name":"https://git.kernel.org/stable/c/f061f7c331fc16250fc82aa68964f35821687217","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2e9e10657b04152ed0d6ecae8d0c02a3405e28f5","name":"https://git.kernel.org/stable/c/2e9e10657b04152ed0d6ecae8d0c02a3405e28f5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/de985264eef64be8a90595908f2e6a87946dad34","name":"https://git.kernel.org/stable/c/de985264eef64be8a90595908f2e6a87946dad34","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4954d297c91d292630ab43ba4d195dc371ce65d3","name":"https://git.kernel.org/stable/c/4954d297c91d292630ab43ba4d195dc371ce65d3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-40167","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40167","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f19d5870cbf72d4cb2a8e1f749dff97af99b071e 4954d297c91d292630ab43ba4d195dc371ce65d3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f19d5870cbf72d4cb2a8e1f749dff97af99b071e f061f7c331fc16250fc82aa68964f35821687217 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f19d5870cbf72d4cb2a8e1f749dff97af99b071e 2e9e10657b04152ed0d6ecae8d0c02a3405e28f5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f19d5870cbf72d4cb2a8e1f749dff97af99b071e 1437c95ab2a28b138d4521653583729f61ccb48b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\next4: detect invalid INLINE_DATA + EXTENTS flag combination\n\nsyzbot reported a BUG_ON in ext4_es_cache_extent() when opening a verity\nfile on a corrupted ext4 filesystem mounted without a journal.\n\nThe issue is that the filesystem has an inode with both the INLINE_DATA\nand EXTENTS flags set:\n\n    EXT4-fs error (device loop0): ext4_cache_extents:545: inode #15:\n    comm syz.0.17: corrupted extent tree: lblk 0 < prev 66\n\nInvestigation revealed that the inode has both flags set:\n    DEBUG: inode 15 - flag=1, i_inline_off=164, has_inline=1, extents_flag=1\n\nThis is an invalid combination since an inode should have either:\n- INLINE_DATA: data stored directly in the inode\n- EXTENTS: data stored in extent-mapped blocks\n\nHaving both flags causes ext4_has_inline_data() to return true, skipping\nextent tree validation in __ext4_iget(). The unvalidated out-of-order\nextents then trigger a BUG_ON in ext4_es_cache_extent() due to integer\nunderflow when calculating hole sizes.\n\nFix this by detecting this invalid flag combination early in ext4_iget()\nand rejecting the corrupted inode."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-30T06:01:04.422Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/4954d297c91d292630ab43ba4d195dc371ce65d3"},{"url":"https://git.kernel.org/stable/c/f061f7c331fc16250fc82aa68964f35821687217"},{"url":"https://git.kernel.org/stable/c/2e9e10657b04152ed0d6ecae8d0c02a3405e28f5"},{"url":"https://git.kernel.org/stable/c/1437c95ab2a28b138d4521653583729f61ccb48b"},{"url":"https://git.kernel.org/stable/c/cb6039b68efa547b676a8a10fc4618d9d1865c23"},{"url":"https://git.kernel.org/stable/c/de985264eef64be8a90595908f2e6a87946dad34"},{"url":"https://git.kernel.org/stable/c/1f5ccd22ff482639133f2a0fe08f6d19d0e68717"},{"url":"https://git.kernel.org/stable/c/1d3ad183943b38eec2acf72a0ae98e635dc8456b"}],"title":"ext4: detect invalid INLINE_DATA + EXTENTS flag combination","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2025-40167","datePublished":"2025-11-12T10:26:24.498Z","dateReserved":"2025-04-16T07:20:57.176Z","dateUpdated":"2026-07-30T06:01:04.422Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-11-12 11:15:47","lastModifiedDate":"2026-07-30 06:24:14","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"40167","Ordinal":"1","Title":"ext4: detect invalid INLINE_DATA + EXTENTS flag combination","CVE":"CVE-2025-40167","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"40167","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: detect invalid INLINE_DATA + EXTENTS flag combination\n\nsyzbot reported a BUG_ON in ext4_es_cache_extent() when opening a verity\nfile on a corrupted ext4 filesystem mounted without a journal.\n\nThe issue is that the filesystem has an inode with both the INLINE_DATA\nand EXTENTS flags set:\n\n    EXT4-fs error (device loop0): ext4_cache_extents:545: inode #15:\n    comm syz.0.17: corrupted extent tree: lblk 0 < prev 66\n\nInvestigation revealed that the inode has both flags set:\n    DEBUG: inode 15 - flag=1, i_inline_off=164, has_inline=1, extents_flag=1\n\nThis is an invalid combination since an inode should have either:\n- INLINE_DATA: data stored directly in the inode\n- EXTENTS: data stored in extent-mapped blocks\n\nHaving both flags causes ext4_has_inline_data() to return true, skipping\nextent tree validation in __ext4_iget(). The unvalidated out-of-order\nextents then trigger a BUG_ON in ext4_es_cache_extent() due to integer\nunderflow when calculating hole sizes.\n\nFix this by detecting this invalid flag combination early in ext4_iget()\nand rejecting the corrupted inode.","Type":"Description","Title":"ext4: detect invalid INLINE_DATA + EXTENTS flag combination"}]}}}