{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45892","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-13T15:03:33.083Z","datePublished":"2026-05-27T12:17:03.175Z","dateUpdated":"2026-05-30T10:41:42.703Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-30T10:41:42.703Z"},"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."}],"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":"ddf854e59166533b0f46ba32cd6cd9aca3197d1b","lessThan":"28db4bfc6f82fd20e2aadb7fc162244109a4eb31","status":"affected","versionType":"git"},{"version":"58ddae5d77b1db3a27b891c75a8fa120239ac092","lessThan":"f0931a5c17005a0c4fc35bd1a001245effc3354b","status":"affected","versionType":"git"},{"version":"d17857b4fb9ba5745b59be0ef38fd532991fccbf","lessThan":"d8ee559fccdef713f058cfe5f2c03dc9b18be3b1","status":"affected","versionType":"git"},{"version":"d67c8ecf3d8fda9b8ef80e6f665d84b6d6ac9d88","lessThan":"c2ee51d684adca7645e4aa74adca13f6750390bc","status":"affected","versionType":"git"},{"version":"7015fcf473796e1d2d876f241bd9e0c36f3d4eef","lessThan":"a1b962a821e7a52d48212ae269b45808b4411267","status":"affected","versionType":"git"},{"version":"1bf6974822d1dba86cf11b5f05498581cf3488a2","lessThan":"6d882ea3b0931b43530d44149b79fcd4ffc13030","status":"affected","versionType":"git"}]},{"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":"6.1.167","lessThan":"6.1.168","status":"affected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.167","versionEndExcluding":"6.1.168"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/28db4bfc6f82fd20e2aadb7fc162244109a4eb31"},{"url":"https://git.kernel.org/stable/c/f0931a5c17005a0c4fc35bd1a001245effc3354b"},{"url":"https://git.kernel.org/stable/c/d8ee559fccdef713f058cfe5f2c03dc9b18be3b1"},{"url":"https://git.kernel.org/stable/c/c2ee51d684adca7645e4aa74adca13f6750390bc"},{"url":"https://git.kernel.org/stable/c/a1b962a821e7a52d48212ae269b45808b4411267"},{"url":"https://git.kernel.org/stable/c/6d882ea3b0931b43530d44149b79fcd4ffc13030"}],"title":"ext4: drop extent cache after doing PARTIAL_VALID1 zeroout","x_generator":{"engine":"bippy-1.2.0"}}}}