SB20260912168 - Incorrect Conversion between Numeric Types in Linux kernel ntfs
Published: September 12, 2026
Security Bulletin ID
SB20260912168
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Incorrect Conversion between Numeric Types (CVE-ID: CVE-2026-89612)
CWE-ID: CWE-681 - Incorrect Conversion between Numeric Types
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause an out-of-bounds access.
The vulnerability exists due to improper numeric type conversion in parse_ntfs_boot_sector() in the NTFS filesystem driver when parsing a crafted NTFS boot sector. A local user can provide high-bit MFT or MFTMirr LCN values that are interpreted as negative values to cause an out-of-bounds access.
Remediation
Install update from vendor's website.