{"id":"CVE-2026-90279","state":"PUBLISHED","title":"md/raid5: round bitmap stripes with sector division","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid5: round bitmap stripes with sector division\n\nraid5_bitmap_sector_map() aligns the array range to full RAID5 stripe\nwidths before converting it to component sectors. That width is\nchunk_sectors multiplied by the number of data disks, and it is not\nalways a power of two.\n\nReproduce with a 4-disk RAID5, 1024-sector chunks, and three data disks.\nThe full-stripe width is 3072 sectors. For a one-sector write at array\nsector 3072, correct rounding gives array range [3072, 6144), which maps\nto component range [1024, 2048). The old round_down()/round_up() logic\ninstead gives [1024, 4096), which maps to [0, 1024).\n\nUse sector_div() based arithmetic so the rounded range is aligned to the\nactual RAID5 stripe width.\n\nThe deterministic mapper test now reports the fixed component range as\n[1024, 2048), while the old mask-based range was [0, 1024).","publishedAt":"2026-09-17T16:08:10.654Z","updatedAt":"2026-10-19T09:00:57.773Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b29e6400be51c214a0ad30dce937348b57abe33a","status":"affected","lessThan":"9d7490007707f90691911385365bd1d691d99225","versionType":"git"},{"version":"aa8e15d69f5c0044d5bff61844e163aacc4ac172","status":"affected","lessThan":"cab7d949b18b2f1cd625689dc16c5f81236bac93","versionType":"git"},{"version":"9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb","status":"affected","lessThan":"02c10581866d08822c6348e299881485fc546185","versionType":"git"},{"version":"9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb","status":"affected","lessThan":"ccbdc483eb041eef809e9ff223d1ad63518a2c52","versionType":"git"},{"version":"9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb","status":"affected","lessThan":"17ea021ae74987d6064c8195c4922fa025753892","versionType":"git"},{"version":"a41a0df5d7638acf15e723ad985980b4f7ff9383","status":"affected","versionType":"git"},{"version":"6.6.79","status":"affected","lessThan":"6.6.157","versionType":"semver"},{"version":"6.12.13","status":"affected","lessThan":"6.12.110","versionType":"semver"},{"version":"6.13.2","status":"affected","lessThan":"6.14","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/raid5.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.14","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/raid5.c"]}],"references":["https://git.kernel.org/stable/c/9d7490007707f90691911385365bd1d691d99225","https://git.kernel.org/stable/c/cab7d949b18b2f1cd625689dc16c5f81236bac93","https://git.kernel.org/stable/c/02c10581866d08822c6348e299881485fc546185","https://git.kernel.org/stable/c/ccbdc483eb041eef809e9ff223d1ad63518a2c52","https://git.kernel.org/stable/c/17ea021ae74987d6064c8195c4922fa025753892"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90279.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90279","state":"PUBLISHED","datePublished":"2026-09-17T16:08:10.654Z","dateUpdated":"2026-10-19T09:00:57.773Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.797Z"},"containers":{"cna":{"title":"md/raid5: round bitmap stripes with sector division","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid5: round bitmap stripes with sector division\n\nraid5_bitmap_sector_map() aligns the array range to full RAID5 stripe\nwidths before converting it to component sectors. That width is\nchunk_sectors multiplied by the number of data disks, and it is not\nalways a power of two.\n\nReproduce with a 4-disk RAID5, 1024-sector chunks, and three data disks.\nThe full-stripe width is 3072 sectors. For a one-sector write at array\nsector 3072, correct rounding gives array range [3072, 6144), which maps\nto component range [1024, 2048). The old round_down()/round_up() logic\ninstead gives [1024, 4096), which maps to [0, 1024).\n\nUse sector_div() based arithmetic so the rounded range is aligned to the\nactual RAID5 stripe width.\n\nThe deterministic mapper test now reports the fixed component range as\n[1024, 2048), while the old mask-based range was [0, 1024)."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b29e6400be51c214a0ad30dce937348b57abe33a","status":"affected","lessThan":"9d7490007707f90691911385365bd1d691d99225","versionType":"git"},{"version":"aa8e15d69f5c0044d5bff61844e163aacc4ac172","status":"affected","lessThan":"cab7d949b18b2f1cd625689dc16c5f81236bac93","versionType":"git"},{"version":"9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb","status":"affected","lessThan":"02c10581866d08822c6348e299881485fc546185","versionType":"git"},{"version":"9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb","status":"affected","lessThan":"ccbdc483eb041eef809e9ff223d1ad63518a2c52","versionType":"git"},{"version":"9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb","status":"affected","lessThan":"17ea021ae74987d6064c8195c4922fa025753892","versionType":"git"},{"version":"a41a0df5d7638acf15e723ad985980b4f7ff9383","status":"affected","versionType":"git"},{"version":"6.6.79","status":"affected","lessThan":"6.6.157","versionType":"semver"},{"version":"6.12.13","status":"affected","lessThan":"6.12.110","versionType":"semver"},{"version":"6.13.2","status":"affected","lessThan":"6.14","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/raid5.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.14","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/raid5.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/9d7490007707f90691911385365bd1d691d99225"},{"url":"https://git.kernel.org/stable/c/cab7d949b18b2f1cd625689dc16c5f81236bac93"},{"url":"https://git.kernel.org/stable/c/02c10581866d08822c6348e299881485fc546185"},{"url":"https://git.kernel.org/stable/c/ccbdc483eb041eef809e9ff223d1ad63518a2c52"},{"url":"https://git.kernel.org/stable/c/17ea021ae74987d6064c8195c4922fa025753892"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:00:57.773Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.79","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.13","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}