SB20260912199 - Numeric Truncation Error in Linux kernel md driver
Published: September 12, 2026
Security Bulletin ID
SB20260912199
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Numeric Truncation Error (CVE-ID: CVE-2026-89578)
CWE-ID: CWE-197 - Numeric Truncation Error
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause an I/O hang.
The vulnerability exists due to numeric truncation in the dm-io do_region() function when processing misaligned direct I/O requests to a dm-mirror device. A local user can submit a misaligned direct I/O request to cause an I/O hang.
Remediation
Install update from vendor's website.