CVE-2026-45892

{"id": "CVE-2026-45892", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "ddf854e59166533b0f46ba32cd6cd9aca3197d1b", "lessThan": "28db4bfc6f82fd20e2aadb7fc162244109a4eb31", "versionType": "git"}, {"status": "affected", "version": "58ddae5d77b1db3a27b891c75a8fa120239ac092", "lessThan": "f0931a5c17005a0c4fc35bd1a001245effc3354b", "versionType": "git"}, {"status": "affected", "version": "d17857b4fb9ba5745b59be0ef38fd532991fccbf", "lessThan": "d8ee559fccdef713f058cfe5f2c03dc9b18be3b1", "versionType": "git"}, {"status": "affected", "version": "d67c8ecf3d8fda9b8ef80e6f665d84b6d6ac9d88", "lessThan": "c2ee51d684adca7645e4aa74adca13f6750390bc", "versionType": "git"}, {"status": "affected", "version": "7015fcf473796e1d2d876f241bd9e0c36f3d4eef", "lessThan": "a1b962a821e7a52d48212ae269b45808b4411267", "versionType": "git"}, {"status": "affected", "version": "1bf6974822d1dba86cf11b5f05498581cf3488a2", "lessThan": "6d882ea3b0931b43530d44149b79fcd4ffc13030", "versionType": "git"}], "programFiles": ["fs/ext4/extents.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.1.167", "lessThan": "6.1.168", "versionType": "semver"}], "programFiles": ["fs/ext4/extents.c"], "defaultStatus": "unaffected"}]}], "published": "2026-05-27T14:17:03.353", "references": [{"url": "https://git.kernel.org/stable/c/28db4bfc6f82fd20e2aadb7fc162244109a4eb31", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6d882ea3b0931b43530d44149b79fcd4ffc13030", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a1b962a821e7a52d48212ae269b45808b4411267", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c2ee51d684adca7645e4aa74adca13f6750390bc", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d8ee559fccdef713f058cfe5f2c03dc9b18be3b1", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f0931a5c17005a0c4fc35bd1a001245effc3354b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: drop extent cache after doing PARTIAL_VALID1 zeroout\n\nWhen splitting an unwritten extent in the middle and converting it to\ninitialized in ext4_split_extent() with the EXT4_EXT_MAY_ZEROOUT and\nEXT4_EXT_DATA_VALID2 flags set, it could leave a stale unwritten extent.\n\nAssume we have an unwritten file and buffered write in the middle of it\nwithout dioread_nolock enabled, it will allocate blocks as written\nextent.\n\n 0 A B N\n [UUUUUUUUUUUU] on-disk extent U: unwritten extent\n [UUUUUUUUUUUU] extent status tree\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_PARTIAL_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 leave the entire extent as unwritten.\n\n 0 A B N\n [UUUUUUUUUUUU] on-disk extent\n [UUUUUUUUUUUU] extent status tree\n [--DDDDDDDDZZ] Z: zeroed 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\nleave an written extent from A to N.\n\n 0 A B N\n [UUWWWWWWWWWW] on-disk extent W: written extent\n [UUUUUUUUUUUU] extent status tree\n [--DDDDDDDDZZ]\n\nFinally ext4_map_create_blocks() only insert extent A to B to the extent\nstatus tree, and leave an stale unwritten extent in the status tree.\n\n 0 A B N\n [UUWWWWWWWWWW] on-disk extent W: written extent\n [UUWWWWWWWWUU] extent status tree\n [--DDDDDDDDZZ]\n\nFix this issue by always cached extent status entry after zeroing out\nthe second part."}], "lastModified": "2026-06-25T21:11:06.653", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:6.1.167:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B898A4FB-4E74-40F7-B523-B71FFB681B6D"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}