SB20260918284 - Improper Check or Handling of Exceptional Conditions in Linux kernel md driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-90390)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper error handling in the md bitmap backlog_store() function when attempting to set backlog on an array without a write-mostly device. A local user can trigger the error path to cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/03aad318f0a1f039dddf98739e705fdca3bf0d86
• https://git.kernel.org/stable/c/2911cd0a0f4366a7e06832bc5f0a7fdcc138e4dc
• https://git.kernel.org/stable/c/6763fb409a0b4106676a52cf934440d9484b32c8
• https://git.kernel.org/stable/c/cc543e769b97d563b089b9e0ebf8ad361d15076f