Incorrect calculation in Linux kernel - CVE-2026-90279

Vulnerability identifier: #VU151205

CSH Severity: Low

CVSS v4: 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]

CVE-ID: CVE-2026-90279

CWE-ID: CWE-682

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.111-1

• 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

• Incorrect calculation in Linux kernel md driver
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more