Improper input validation in Linux kernel - CVE-2026-98127
Published: September 28, 2026
Vulnerability identifier: #VU152310
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98127
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to bypass file-size limits.
The vulnerability exists due to improper validation of the calculated end-of-file size in smb3_insert_range() when handling FALLOC_FL_INSERT_RANGE requests on a CIFS mount. A local user can invoke fallocate with FALLOC_FL_INSERT_RANGE to bypass file-size limits.
Affected software
Linux kernel
How to mitigate CVE-2026-98127
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3