{"affected":[{"defaultStatus":"unaffected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"lessThan":"28db4bfc6f82fd20e2aadb7fc162244109a4eb31","status":"affected","version":"ddf854e59166533b0f46ba32cd6cd9aca3197d1b","versionType":"git"},{"lessThan":"f0931a5c17005a0c4fc35bd1a001245effc3354b","status":"affected","version":"58ddae5d77b1db3a27b891c75a8fa120239ac092","versionType":"git"},{"lessThan":"d8ee559fccdef713f058cfe5f2c03dc9b18be3b1","status":"affected","version":"d17857b4fb9ba5745b59be0ef38fd532991fccbf","versionType":"git"},{"lessThan":"c2ee51d684adca7645e4aa74adca13f6750390bc","status":"affected","version":"d67c8ecf3d8fda9b8ef80e6f665d84b6d6ac9d88","versionType":"git"},{"lessThan":"a1b962a821e7a52d48212ae269b45808b4411267","status":"affected","version":"7015fcf473796e1d2d876f241bd9e0c36f3d4eef","versionType":"git"},{"lessThan":"6d882ea3b0931b43530d44149b79fcd4ffc13030","status":"affected","version":"1bf6974822d1dba86cf11b5f05498581cf3488a2","versionType":"git"}]},{"defaultStatus":"unaffected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"lessThan":"6.1.168","status":"affected","version":"6.1.167","versionType":"semver"}]}],"cveId":"CVE-2026-45892","cwes":[],"description":"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.","epss":{"date":"2026-11-06","percentile":0.0527,"score":0.0016},"exploits":[],"kev":null,"metrics":[],"modifiedAt":1793980391239,"publishedAt":1779884223175,"references":[{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/28db4bfc6f82fd20e2aadb7fc162244109a4eb31"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/f0931a5c17005a0c4fc35bd1a001245effc3354b"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/d8ee559fccdef713f058cfe5f2c03dc9b18be3b1"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/c2ee51d684adca7645e4aa74adca13f6750390bc"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/a1b962a821e7a52d48212ae269b45808b4411267"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/6d882ea3b0931b43530d44149b79fcd4ffc13030"}],"remediation":[],"revision":"fc0b762bfb0407f9a543daac00c1ef4a0368ce85d7b0cf968d10d84f113b141c","sources":[{"modifiedAt":1793980391239,"name":"CNA: Linux","retrievedAt":1793981764308,"url":"https://www.cve.org/CVERecord?id=CVE-2026-45892"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793981787256,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-45892"}],"ssvc":{"assessedAt":1793979826849,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"ext4: drop extent cache after doing PARTIAL_VALID1 zeroout","updatedAt":1793981787256}