SB2026091339 - Improper input validation in Linux kernel lib
Published: September 13, 2026
Security Bulletin ID
SB2026091339
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-89584)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to compromise confidentiality, integrity, and availability.
The vulnerability exists due to improper input validation in the block-layer bio_iov_iter_get_pages function when building bios from misaligned user-space vectors. A local user can provide misaligned user-space vectors to compromise confidentiality, integrity, and availability.
Remediation
Install update from vendor's website.