SB20260918392 - Incorrect calculation in Linux kernel md driver
Published: September 18, 2026
Security Bulletin ID
SB20260918392
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Incorrect calculation (CVE-ID: CVE-2026-90279)
CWE-ID: CWE-682 - Incorrect Calculation
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause incorrect RAID5 bitmap sector mapping.
The vulnerability exists due to improper rounding arithmetic in raid5_bitmap_sector() when processing a write range with a non-power-of-two full RAID5 stripe width. A local user can issue a one-sector write at a full-stripe boundary to cause incorrect RAID5 bitmap sector mapping.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/02c10581866d08822c6348e299881485fc546185
- https://git.kernel.org/stable/c/17ea021ae74987d6064c8195c4922fa025753892
- https://git.kernel.org/stable/c/9d7490007707f90691911385365bd1d691d99225
- https://git.kernel.org/stable/c/cab7d949b18b2f1cd625689dc16c5f81236bac93
- https://git.kernel.org/stable/c/ccbdc483eb041eef809e9ff223d1ad63518a2c52