Improper Validation of Specified Quantity in Input in Linux kernel - CVE-2026-89617
Published: September 12, 2026
Vulnerability identifier: #VU149194
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-2026-89617
CWE-ID: CWE-1284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause an out-of-bounds memory access.
The vulnerability exists due to improper validation of an on-disk array length in DIR_PAGE_ENTRY entries during NTFS3 log replay when replaying a crafted NTFS log. A local user can provide a crafted lcns_follow value that exceeds the page_lcns[] entry bounds to cause an out-of-bounds memory access.
Affected software
Linux kernel
How to mitigate CVE-2026-89617
Install security update from vendor's repository.