CVE-2026-90279
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Vulnerability report for CVE-2026-90279, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-17
Last updated on: 2026-09-17
Assigner: kernel.org
Description
Description
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).
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | b29e6400be51c214a0ad30dce937348b57abe33a |
| Linux | Linux | aa8e15d69f5c0044d5bff61844e163aacc4ac172 |
| Linux | Linux | 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb |
| Linux | Linux | 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb |
| Linux | Linux | 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb |
| Linux | Linux | a41a0df5d7638acf15e723ad985980b4f7ff9383 |
| Linux | Linux | 6.6.79 |
| Linux | Linux | 6.12.13 |
| Linux | Linux | 6.13.2 |
| Linux | Linux | 6.14 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
