Out-of-bounds write in Linux kernel - CVE-2026-89611
Published: September 12, 2026
Vulnerability identifier: #VU149189
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89611
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper validation of non-resident attribute offsets in the NTFS attribute conversion logic when converting non-resident NTFS attributes between sparse and non-sparse formats. A local user can supply a malicious MFT record to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-89611
Install security update from vendor's repository.