{ "cveId": "CVE-2026-45892", "url": "https://patchblox.com/security/cve/CVE-2026-45892", "summary": "CVE-2026-45892 is fixed in 58 products on 1 platform, first by ALAS2023-2026-1681, released May 11, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "ext4: drop extent cache after doing PARTIAL_VALID1 zeroout", "description": "In the Linux kernel, the following vulnerability has been resolved: ext4: drop extent cache after doing PARTIAL_VALID1 zeroout When splitting an unwritten extent in the middle and converting it to initialized in ext4_split_extent() with the EXT4_EXT_MAY_ZEROOUT and EXT4_EXT_DATA_VALID2 flags set, it could leave a stale unwritten extent. Assume we have an unwritten file and buffered write in the middle of it without dioread_nolock enabled, it will allocate blocks as written extent. 0 A B N [UUUUUUUUUUUU] on-disk extent U: unwritten extent [UUUUUUUUUUUU] extent status tree [--DDDDDDDD--] D: valid data |\u003C- -\u003E| ----\u003E this range needs to be initialized ext4_split_extent() first try to split this extent at B with EXT4_EXT_DATA_PARTIAL_VALID1 and EXT4_EXT_MAY_ZEROOUT flag set, but ext4_split_extent_at() failed to split this extent due to temporary lack of space. It zeroout B to N and leave the entire extent as unwritten. 0 A B N [UUUUUUUUUUUU] on-disk extent [UUUUUUUUUUUU] extent status tree [--DDDDDDDDZZ] Z: zeroed data ext4_split_extent() then try to split this extent at A with EXT4_EXT_DATA_VALID2 flag set. This time, it split successfully and leave an written extent from A to N. 0 A B N [UUWWWWWWWWWW] on-disk extent W: written extent [UUUUUUUUUUUU] extent status tree [--DDDDDDDDZZ] Finally ext4_map_create_blocks() only insert extent A to B to the extent status tree, and leave an stale unwritten extent in the status tree. 0 A B N [UUWWWWWWWWWW] on-disk extent W: written extent [UUWWWWWWWWUU] extent status tree [--DDDDDDDDZZ] Fix this issue by always cached extent status entry after zeroing out the second part.", "published": "2026-05-11T09:00:00Z", "severity": "Important", "cvss": 7, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.0016, "epssPercentile": 0.05257, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45892", "fixes": [ { "platform": "linux", "product": "bpftool", "release": "amzn 2023", "fixedVersion": "1:6.1.168-202.320.amzn2023", "fix": "ALAS2023-2026-1681", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1681", "released": "2026-05-11T09:00:00Z" }, { "platform": "linux", "product": "bpftool-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.1.168-202.320.amzn2023", "fix": "ALAS2023-2026-1681", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1681", "released": "2026-05-11T09:00:00Z" }, { "platform": "linux", "product": "kernel", "release": "amzn 2023", "fixedVersion": "1:6.1.168-202.320.amzn2023", "fix": "ALAS2023-2026-1681", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1681", "released": "2026-05-11T09:00:00Z" }, { "platform": "linux", "product": "kernel-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.1.168-202.320.amzn2023", "fix": "ALAS2023-2026-1681", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1681", "released": "2026-05-11T09:00:00Z" }, { "platform": "linux", "product": "kernel-debuginfo-common-aarch64", "release": "amzn 2023", "fixedVersion": "1:6.1.168-202.320.amzn2023", "fix": "ALAS2023-2026-1681", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1681", "released": "2026-05-11T09:00:00Z" }, { "platform": "linux", "product": "kernel-debuginfo-common-x86_64", "release": "amzn 2023", "fixedVersion": "1:6.1.168-202.320.amzn2023", "fix": "ALAS2023-2026-1681", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1681", "released": "2026-05-11T09:00:00Z" }, { "platform": "linux", "product": "kernel-devel", "release": "amzn 2023", "fixedVersion": "1:6.1.168-202.320.amzn2023", "fix": "ALAS2023-2026-1681", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1681", "released": "2026-05-11T09:00:00Z" }, { "platform": "linux", "product": "kernel-headers", "release": "amzn 2023", "fixedVersion": "1:6.1.168-202.320.amzn2023", "fix": "ALAS2023-2026-1681", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1681", 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"released": "2026-07-02T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-core", "release": "ol 10", "fixedVersion": "0:6.12.0-204.92.4.2.el9uek", "fix": "ELSA-2026-50372", "url": "https://patchblox.com/security/fix/linux/elsa-2026-50372", "released": "2026-07-02T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-core", "release": "ol 9", "fixedVersion": "0:6.12.0-204.92.4.2.el9uek", "fix": "ELSA-2026-50372", "url": "https://patchblox.com/security/fix/linux/elsa-2026-50372", "released": "2026-07-02T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-deprecated", "release": "ol 10", "fixedVersion": "0:6.12.0-204.92.4.2.el9uek", "fix": "ELSA-2026-50372", "url": "https://patchblox.com/security/fix/linux/elsa-2026-50372", "released": "2026-07-02T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-deprecated", "release": "ol 9", "fixedVersion": "0:6.12.0-204.92.4.2.el9uek", "fix": "ELSA-2026-50372", "url": 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