Improper input validation in Linux kernel - CVE-2026-89613
Published: September 13, 2026
Vulnerability identifier: #VU149470
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89613
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89613
Install security update from vendor's repository.