Incorrect Conversion between Numeric Types in Linux kernel - CVE-2026-89612
Published: September 12, 2026
Vulnerability identifier: #VU149190
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89612
CWE-ID: CWE-681
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89612
Install security update from vendor's repository.