CVE-2026-90279
CVE CVE-2026-90279EUVD EUVD-2026-81872Published 2026-09-17T16:08:10.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: md/raid5: round bitmap stripes with sector division raid5_bitmap_sector_map() aligns the array range to full RAID5 stripe widths before converting it to component sectors. That width is chunk_sectors multiplied by the number of data disks, and it is not always a power of two. Reproduce with a 4-disk RAID5, 1024-sector chunks, and three data disks. The full-stripe width is 3072 sectors. For a one-sector write at array sector 3072, correct rounding gives array range [3072, 6144), which maps to component range [1024, 2048). The old round_down()/round_up() logic instead gives [1024, 4096), which maps to [0, 1024). Use sector_div() based arithmetic so the rounded range is aligned to the actual RAID5 stripe width. The deterministic mapper test now reports the fixed component range as [1024, 2048), while the old mask-based range was [0, 1024).
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux aa8e15d69f5c0044d5bff61844e163aacc4ac172 <cab7d949b18b2f1cd625689dc16c5f81236bac93; patch: 7.2.6; 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb <02c10581866d08822c6348e299881485fc546185; 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb <ccbdc483eb041eef809e9ff223d1ad63518a2c52; 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb <17ea021ae74987d6064c8195c4922fa025753892; 6.13.2 <6.14; 6.6.79 <6.6.157; a41a0df5d7638acf15e723ad985980b4f7ff9383; 6.12.13 <6.12.110; patch: 0; patch: 7.3-rc1; patch: 6.12.110; patch: 6.18.52; b29e6400be51c214a0ad30dce937348b57abe33a <9d7490007707f90691911385365bd1d691d99225; 6.14; patch: 6.6.157
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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