Incorrect calculation in Linux kernel - CVE-2026-98139
Published: September 28, 2026
Vulnerability identifier: #VU152304
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98139
CWE-ID: CWE-682
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to corrupt NTFS free-space accounting.
The vulnerability exists due to incorrect accounting in ntfs_cluster_free_from_rl_nolock() when freeing NTFS cluster runs after ntfs_bitmap_clear_run() fails. A local user can trigger the freeing of cluster runs after a bitmap-clear failure to corrupt NTFS free-space accounting.
A failed bitmap-clear operation rolls back its partial modifications.
Affected software
Linux kernel
How to mitigate CVE-2026-98139
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3