CVE-2026-45858

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It zeroout B to N and mark the entire extent from 0 to N\nas written.\n\n 0 A B N\n [WWWWWWWWWWWW] W: written extent\n [SSDDDDDDDDZZ] Z: zeroed, S: stale data\n\next4_split_extent() then try to split this extent at A with\nEXT4_EXT_DATA_VALID2 flag set. This time, it split successfully and left\na stale written extent from 0 to A.\n\n 0 A B N\n [WW|WWWWWWWWWW]\n [SS|DDDDDDDDZZ]\n\nFix this by pass EXT4_EXT_DATA_PARTIAL_VALID1 to ext4_split_extent_at()\nwhen splitting at B, don't convert the entire extent to written and left\nit as unwritten after zeroing out B to N. The remaining work is just\nlike the standard two-part split. ext4_split_extent() will pass the\nEXT4_EXT_DATA_VALID2 flag when it calls ext4_split_extent_at() for the\nsecond time, allowing it to properly handle the split. If the split is\nsuccessful, it will keep extent from 0 to A as unwritten."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/extents.c"], "versions": [{"version": "dee1f973ca341c266229faa5a1a5bb268bed3531", "lessThan": "58ddae5d77b1db3a27b891c75a8fa120239ac092", "status": "affected", "versionType": "git"}, {"version": "dee1f973ca341c266229faa5a1a5bb268bed3531", "lessThan": "d17857b4fb9ba5745b59be0ef38fd532991fccbf", "status": "affected", "versionType": "git"}, {"version": "dee1f973ca341c266229faa5a1a5bb268bed3531", "lessThan": "d67c8ecf3d8fda9b8ef80e6f665d84b6d6ac9d88", "status": "affected", "versionType": "git"}, {"version": "dee1f973ca341c266229faa5a1a5bb268bed3531", "lessThan": "7015fcf473796e1d2d876f241bd9e0c36f3d4eef", "status": "affected", "versionType": "git"}, {"version": "dee1f973ca341c266229faa5a1a5bb268bed3531", "lessThan": "1bf6974822d1dba86cf11b5f05498581cf3488a2", "status": "affected", "versionType": "git"}, {"version": "814a7833df19e1de7447f870ae890adb12561627", "status": "affected", "versionType": "git"}, {"version": "4319fd00002630a761fa5559a086f11ed7623006", "status": "affected", "versionType": "git"}, {"version": "e28b27be06c5e6a5236c0c0b370ca0768ab086bb", "status": "affected", "versionType": "git"}, {"version": "3.2.33", "lessThan": "3.3", "status": "affected", "versionType": "semver"}, {"version": "3.4.16", "lessThan": "3.5", "status": "affected", "versionType": "semver"}, {"version": "3.6.4", "lessThan": "3.7", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/extents.c"], "versions": [{"version": "3.7", "status": "affected"}, {"version": "0", "lessThan": "3.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.14", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.4", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.6.130"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.12.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.18.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.19.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "7.0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2.33"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6.4"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/58ddae5d77b1db3a27b891c75a8fa120239ac092"}, {"url": "https://git.kernel.org/stable/c/d17857b4fb9ba5745b59be0ef38fd532991fccbf"}, {"url": "https://git.kernel.org/stable/c/d67c8ecf3d8fda9b8ef80e6f665d84b6d6ac9d88"}, {"url": "https://git.kernel.org/stable/c/7015fcf473796e1d2d876f241bd9e0c36f3d4eef"}, {"url": "https://git.kernel.org/stable/c/1bf6974822d1dba86cf11b5f05498581cf3488a2"}], "title": "ext4: don't zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1", "x_generator": {"engine": "bippy-1.2.0"}}}}

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"A2691362-ECBE-4871-8533-EC32418EB525", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: don't zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1\n\nWhen allocating initialized blocks from a large unwritten extent, or\nwhen splitting an unwritten extent during end I/O and converting it to\ninitialized, there is currently a potential issue of stale data if the\nextent needs to be split in the middle.\n\n 0 A B N\n [UUUUUUUUUUUU] U: unwritten extent\n [--DDDDDDDD--] D: valid data\n |<- ->| ----> this range needs to be initialized\n\next4_split_extent() first try to split this extent at B with\nEXT4_EXT_DATA_ENTIRE_VALID1 and EXT4_EXT_MAY_ZEROOUT flag set, but\next4_split_extent_at() failed to split this extent due to temporary lack\nof space. It zeroout B to N and mark the entire extent from 0 to N\nas written.\n\n 0 A B N\n [WWWWWWWWWWWW] W: written extent\n [SSDDDDDDDDZZ] Z: zeroed, S: stale data\n\next4_split_extent() then try to split this extent at A with\nEXT4_EXT_DATA_VALID2 flag set. This time, it split successfully and left\na stale written extent from 0 to A.\n\n 0 A B N\n [WW|WWWWWWWWWW]\n [SS|DDDDDDDDZZ]\n\nFix this by pass EXT4_EXT_DATA_PARTIAL_VALID1 to ext4_split_extent_at()\nwhen splitting at B, don't convert the entire extent to written and left\nit as unwritten after zeroing out B to N. The remaining work is just\nlike the standard two-part split. ext4_split_extent() will pass the\nEXT4_EXT_DATA_VALID2 flag when it calls ext4_split_extent_at() for the\nsecond time, allowing it to properly handle the split. If the split is\nsuccessful, it will keep extent from 0 to A as unwritten."}], "id": "CVE-2026-45858", "lastModified": "2026-06-25T21:07:42.173", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-27T14:16:57.943", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1bf6974822d1dba86cf11b5f05498581cf3488a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/58ddae5d77b1db3a27b891c75a8fa120239ac092"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7015fcf473796e1d2d876f241bd9e0c36f3d4eef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d17857b4fb9ba5745b59be0ef38fd532991fccbf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d67c8ecf3d8fda9b8ef80e6f665d84b6d6ac9d88"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ext4: don't zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1", "id": "2482100", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482100"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-909", "details": ["A flaw was found in the Linux kernel's ext4 filesystem. This vulnerability occurs during the splitting of unwritten data blocks, where a portion of the data may be incorrectly marked as written while still containing stale, uninitialized information. A local attacker could potentially exploit this to access sensitive data that should have been zeroed out, leading to information disclosure."], "name": "CVE-2026-45858", "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-45858\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-45858\nhttps://lore.kernel.org/linux-cve-announce/2026052710-CVE-2026-45858-54e5@gregkh/T"], "threat_severity": "Important"}

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