SB2026091338 - Improper input validation in Linux kernel ntfs
Published: September 13, 2026
Security Bulletin ID
SB2026091338
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-2026-89613)
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 escalate privileges on the system.
The vulnerability exists due to failure to reject invalid empty mapping pairs in the NTFS mapping-pairs decompression routine when processing an NTFS attribute with empty mapping pairs and inconsistent metadata. A local user can pass a crafted NTFS attribute to write arbitrary data and eventually execute code with elevated privileges.
Remediation
Install update from vendor's website.